[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
** Tags added: cscc -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Status in linux-azure package in Ubuntu: Fix Released Status in linux source package in Bionic: In Progress Status in linux-azure source package in Bionic: Fix Released Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
This bug was fixed in the package linux-azure - 4.15.0-1025.26~16.04.1 --- linux-azure (4.15.0-1025.26~16.04.1) xenial; urgency=medium [ Ubuntu: 4.15.0-36.39 ] * CVE-2018-14633 - iscsi target: Use hex2bin instead of a re-implementation * CVE-2018-17182 - mm: get rid of vmacache_flush_all() entirely linux-azure (4.15.0-1024.25) bionic; urgency=medium * linux-azure: 4.15.0-1024.25 -proposed tracker (LP: #1791726) * [Regression] kernel crashdump fails on arm64 (LP: #1786878) - [config] update configs after rebase * azure 4.15 kernel: reading sysfs file causing oops (LP: #1789638) - SAUCE: vmbus: don't return values for uninitalized channels [ Ubuntu: 4.15.0-35.38 ] * linux: 4.15.0-35.38 -proposed tracker (LP: #1791719) * device hotplug of vfio devices can lead to deadlock in vfio_pci_release (LP: #1792099) - SAUCE: vfio -- release device lock before userspace requests * L1TF mitigation not effective in some CPU and RAM combinations (LP: #1788563) - x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit - x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM - x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ * CVE-2018-15594 - x86/paravirt: Fix spectre-v2 mitigations for paravirt guests * CVE-2017-5715 (Spectre v2 s390x) - KVM: s390: implement CPU model only facilities - s390: detect etoken facility - KVM: s390: add etoken support for guests - s390/lib: use expoline for all bcr instructions - s390: fix br_r1_trampoline for machines without exrl - SAUCE: s390: use expoline thunks for all branches generated by the BPF JIT * Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next state disabled (performance) (LP: #1790602) - cpuidle: powernv: Fix promotion from snooze if next state disabled * Watchdog CPU:19 Hard LOCKUP when kernel crash was triggered (LP: #1790636) - powerpc: hard disable irqs in smp_send_stop loop - powerpc: Fix deadlock with multiple calls to smp_send_stop - powerpc: smp_send_stop do not offline stopped CPUs - powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled * Security fix: check if IOMMU page is contained in the pinned physical page (LP: #1785675) - vfio/spapr: Use IOMMU pageshift rather than pagesize - KVM: PPC: Check if IOMMU page is contained in the pinned physical page * Missing Intel GPU pci-id's (LP: #1789924) - drm/i915/kbl: Add KBL GT2 sku - drm/i915/whl: Introducing Whiskey Lake platform - drm/i915/aml: Introducing Amber Lake platform - drm/i915/cfl: Add a new CFL PCI ID. * CVE-2018-15572 - x86/speculation: Protect against userspace-userspace spectreRSB * Support Power Management for Thunderbolt Controller (LP: #1789358) - thunderbolt: Handle NULL boot ACL entries properly - thunderbolt: Notify userspace when boot_acl is changed - thunderbolt: Use 64-bit DMA mask if supported by the platform - thunderbolt: Do not unnecessarily call ICM get route - thunderbolt: No need to take tb->lock in domain suspend/complete - thunderbolt: Use correct ICM commands in system suspend - thunderbolt: Add support for runtime PM * random oopses on s390 systems using NVMe devices (LP: #1790480) - s390/pci: fix out of bounds access during irq setup * [Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable) support for arm64 using SMC firmware call to set a hardware chicken bit (LP: #1787993) // CVE-2018-3639 (arm64) - arm64: alternatives: Add dynamic patching feature - KVM: arm/arm64: Do not use kern_hyp_va() with kvm_vgic_global_state - KVM: arm64: Avoid storing the vcpu pointer on the stack - arm/arm64: smccc: Add SMCCC-specific return codes - arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 - arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 - arm64: Add ARCH_WORKAROUND_2 probing - arm64: Add 'ssbd' command-line option - arm64: ssbd: Add global mitigation state accessor - arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation - arm64: ssbd: Restore mitigation status on CPU resume - arm64: ssbd: Introduce thread flag to control userspace mitigation - arm64: ssbd: Add prctl interface for per-thread mitigation - arm64: KVM: Add HYP per-cpu accessors - arm64: KVM: Add ARCH_WORKAROUND_2 support for guests - arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests - arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID - [Config] ARM64_SSBD=y * Reconcile hns3 SAUCE patches with upstream (LP: #1787477) - Revert "UBUNTU: SAUCE: net: hns3: Optimize PF CMDQ interrupt switching process" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox receiving unknown message" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox cannot receiving PF
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
This bug was fixed in the package linux-azure - 4.15.0-1025.26 --- linux-azure (4.15.0-1025.26) bionic; urgency=medium [ Ubuntu: 4.15.0-36.39 ] * CVE-2018-14633 - iscsi target: Use hex2bin instead of a re-implementation * CVE-2018-17182 - mm: get rid of vmacache_flush_all() entirely linux-azure (4.15.0-1024.25) bionic; urgency=medium * linux-azure: 4.15.0-1024.25 -proposed tracker (LP: #1791726) * [Regression] kernel crashdump fails on arm64 (LP: #1786878) - [config] update configs after rebase * azure 4.15 kernel: reading sysfs file causing oops (LP: #1789638) - SAUCE: vmbus: don't return values for uninitalized channels [ Ubuntu: 4.15.0-35.38 ] * linux: 4.15.0-35.38 -proposed tracker (LP: #1791719) * device hotplug of vfio devices can lead to deadlock in vfio_pci_release (LP: #1792099) - SAUCE: vfio -- release device lock before userspace requests * L1TF mitigation not effective in some CPU and RAM combinations (LP: #1788563) - x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit - x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM - x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ * CVE-2018-15594 - x86/paravirt: Fix spectre-v2 mitigations for paravirt guests * CVE-2017-5715 (Spectre v2 s390x) - KVM: s390: implement CPU model only facilities - s390: detect etoken facility - KVM: s390: add etoken support for guests - s390/lib: use expoline for all bcr instructions - s390: fix br_r1_trampoline for machines without exrl - SAUCE: s390: use expoline thunks for all branches generated by the BPF JIT * Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next state disabled (performance) (LP: #1790602) - cpuidle: powernv: Fix promotion from snooze if next state disabled * Watchdog CPU:19 Hard LOCKUP when kernel crash was triggered (LP: #1790636) - powerpc: hard disable irqs in smp_send_stop loop - powerpc: Fix deadlock with multiple calls to smp_send_stop - powerpc: smp_send_stop do not offline stopped CPUs - powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled * Security fix: check if IOMMU page is contained in the pinned physical page (LP: #1785675) - vfio/spapr: Use IOMMU pageshift rather than pagesize - KVM: PPC: Check if IOMMU page is contained in the pinned physical page * Missing Intel GPU pci-id's (LP: #1789924) - drm/i915/kbl: Add KBL GT2 sku - drm/i915/whl: Introducing Whiskey Lake platform - drm/i915/aml: Introducing Amber Lake platform - drm/i915/cfl: Add a new CFL PCI ID. * CVE-2018-15572 - x86/speculation: Protect against userspace-userspace spectreRSB * Support Power Management for Thunderbolt Controller (LP: #1789358) - thunderbolt: Handle NULL boot ACL entries properly - thunderbolt: Notify userspace when boot_acl is changed - thunderbolt: Use 64-bit DMA mask if supported by the platform - thunderbolt: Do not unnecessarily call ICM get route - thunderbolt: No need to take tb->lock in domain suspend/complete - thunderbolt: Use correct ICM commands in system suspend - thunderbolt: Add support for runtime PM * random oopses on s390 systems using NVMe devices (LP: #1790480) - s390/pci: fix out of bounds access during irq setup * [Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable) support for arm64 using SMC firmware call to set a hardware chicken bit (LP: #1787993) // CVE-2018-3639 (arm64) - arm64: alternatives: Add dynamic patching feature - KVM: arm/arm64: Do not use kern_hyp_va() with kvm_vgic_global_state - KVM: arm64: Avoid storing the vcpu pointer on the stack - arm/arm64: smccc: Add SMCCC-specific return codes - arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 - arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 - arm64: Add ARCH_WORKAROUND_2 probing - arm64: Add 'ssbd' command-line option - arm64: ssbd: Add global mitigation state accessor - arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation - arm64: ssbd: Restore mitigation status on CPU resume - arm64: ssbd: Introduce thread flag to control userspace mitigation - arm64: ssbd: Add prctl interface for per-thread mitigation - arm64: KVM: Add HYP per-cpu accessors - arm64: KVM: Add ARCH_WORKAROUND_2 support for guests - arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests - arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID - [Config] ARM64_SSBD=y * Reconcile hns3 SAUCE patches with upstream (LP: #1787477) - Revert "UBUNTU: SAUCE: net: hns3: Optimize PF CMDQ interrupt switching process" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox receiving unknown message" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox cannot receiving PF response"
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
This bug was fixed in the package linux-azure - 4.15.0-1025.26~16.04.1 --- linux-azure (4.15.0-1025.26~16.04.1) xenial; urgency=medium [ Ubuntu: 4.15.0-36.39 ] * CVE-2018-14633 - iscsi target: Use hex2bin instead of a re-implementation * CVE-2018-17182 - mm: get rid of vmacache_flush_all() entirely linux-azure (4.15.0-1024.25) bionic; urgency=medium * linux-azure: 4.15.0-1024.25 -proposed tracker (LP: #1791726) * [Regression] kernel crashdump fails on arm64 (LP: #1786878) - [config] update configs after rebase * azure 4.15 kernel: reading sysfs file causing oops (LP: #1789638) - SAUCE: vmbus: don't return values for uninitalized channels [ Ubuntu: 4.15.0-35.38 ] * linux: 4.15.0-35.38 -proposed tracker (LP: #1791719) * device hotplug of vfio devices can lead to deadlock in vfio_pci_release (LP: #1792099) - SAUCE: vfio -- release device lock before userspace requests * L1TF mitigation not effective in some CPU and RAM combinations (LP: #1788563) - x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit - x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM - x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ * CVE-2018-15594 - x86/paravirt: Fix spectre-v2 mitigations for paravirt guests * CVE-2017-5715 (Spectre v2 s390x) - KVM: s390: implement CPU model only facilities - s390: detect etoken facility - KVM: s390: add etoken support for guests - s390/lib: use expoline for all bcr instructions - s390: fix br_r1_trampoline for machines without exrl - SAUCE: s390: use expoline thunks for all branches generated by the BPF JIT * Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next state disabled (performance) (LP: #1790602) - cpuidle: powernv: Fix promotion from snooze if next state disabled * Watchdog CPU:19 Hard LOCKUP when kernel crash was triggered (LP: #1790636) - powerpc: hard disable irqs in smp_send_stop loop - powerpc: Fix deadlock with multiple calls to smp_send_stop - powerpc: smp_send_stop do not offline stopped CPUs - powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled * Security fix: check if IOMMU page is contained in the pinned physical page (LP: #1785675) - vfio/spapr: Use IOMMU pageshift rather than pagesize - KVM: PPC: Check if IOMMU page is contained in the pinned physical page * Missing Intel GPU pci-id's (LP: #1789924) - drm/i915/kbl: Add KBL GT2 sku - drm/i915/whl: Introducing Whiskey Lake platform - drm/i915/aml: Introducing Amber Lake platform - drm/i915/cfl: Add a new CFL PCI ID. * CVE-2018-15572 - x86/speculation: Protect against userspace-userspace spectreRSB * Support Power Management for Thunderbolt Controller (LP: #1789358) - thunderbolt: Handle NULL boot ACL entries properly - thunderbolt: Notify userspace when boot_acl is changed - thunderbolt: Use 64-bit DMA mask if supported by the platform - thunderbolt: Do not unnecessarily call ICM get route - thunderbolt: No need to take tb->lock in domain suspend/complete - thunderbolt: Use correct ICM commands in system suspend - thunderbolt: Add support for runtime PM * random oopses on s390 systems using NVMe devices (LP: #1790480) - s390/pci: fix out of bounds access during irq setup * [Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable) support for arm64 using SMC firmware call to set a hardware chicken bit (LP: #1787993) // CVE-2018-3639 (arm64) - arm64: alternatives: Add dynamic patching feature - KVM: arm/arm64: Do not use kern_hyp_va() with kvm_vgic_global_state - KVM: arm64: Avoid storing the vcpu pointer on the stack - arm/arm64: smccc: Add SMCCC-specific return codes - arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 - arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 - arm64: Add ARCH_WORKAROUND_2 probing - arm64: Add 'ssbd' command-line option - arm64: ssbd: Add global mitigation state accessor - arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation - arm64: ssbd: Restore mitigation status on CPU resume - arm64: ssbd: Introduce thread flag to control userspace mitigation - arm64: ssbd: Add prctl interface for per-thread mitigation - arm64: KVM: Add HYP per-cpu accessors - arm64: KVM: Add ARCH_WORKAROUND_2 support for guests - arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests - arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID - [Config] ARM64_SSBD=y * Reconcile hns3 SAUCE patches with upstream (LP: #1787477) - Revert "UBUNTU: SAUCE: net: hns3: Optimize PF CMDQ interrupt switching process" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox receiving unknown message" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox cannot receiving PF
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
This bug was fixed in the package linux-azure - 4.15.0-1025.26 --- linux-azure (4.15.0-1025.26) bionic; urgency=medium [ Ubuntu: 4.15.0-36.39 ] * CVE-2018-14633 - iscsi target: Use hex2bin instead of a re-implementation * CVE-2018-17182 - mm: get rid of vmacache_flush_all() entirely linux-azure (4.15.0-1024.25) bionic; urgency=medium * linux-azure: 4.15.0-1024.25 -proposed tracker (LP: #1791726) * [Regression] kernel crashdump fails on arm64 (LP: #1786878) - [config] update configs after rebase * azure 4.15 kernel: reading sysfs file causing oops (LP: #1789638) - SAUCE: vmbus: don't return values for uninitalized channels [ Ubuntu: 4.15.0-35.38 ] * linux: 4.15.0-35.38 -proposed tracker (LP: #1791719) * device hotplug of vfio devices can lead to deadlock in vfio_pci_release (LP: #1792099) - SAUCE: vfio -- release device lock before userspace requests * L1TF mitigation not effective in some CPU and RAM combinations (LP: #1788563) - x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit - x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM - x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ * CVE-2018-15594 - x86/paravirt: Fix spectre-v2 mitigations for paravirt guests * CVE-2017-5715 (Spectre v2 s390x) - KVM: s390: implement CPU model only facilities - s390: detect etoken facility - KVM: s390: add etoken support for guests - s390/lib: use expoline for all bcr instructions - s390: fix br_r1_trampoline for machines without exrl - SAUCE: s390: use expoline thunks for all branches generated by the BPF JIT * Ubuntu18.04.1: cpuidle: powernv: Fix promotion from snooze if next state disabled (performance) (LP: #1790602) - cpuidle: powernv: Fix promotion from snooze if next state disabled * Watchdog CPU:19 Hard LOCKUP when kernel crash was triggered (LP: #1790636) - powerpc: hard disable irqs in smp_send_stop loop - powerpc: Fix deadlock with multiple calls to smp_send_stop - powerpc: smp_send_stop do not offline stopped CPUs - powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled * Security fix: check if IOMMU page is contained in the pinned physical page (LP: #1785675) - vfio/spapr: Use IOMMU pageshift rather than pagesize - KVM: PPC: Check if IOMMU page is contained in the pinned physical page * Missing Intel GPU pci-id's (LP: #1789924) - drm/i915/kbl: Add KBL GT2 sku - drm/i915/whl: Introducing Whiskey Lake platform - drm/i915/aml: Introducing Amber Lake platform - drm/i915/cfl: Add a new CFL PCI ID. * CVE-2018-15572 - x86/speculation: Protect against userspace-userspace spectreRSB * Support Power Management for Thunderbolt Controller (LP: #1789358) - thunderbolt: Handle NULL boot ACL entries properly - thunderbolt: Notify userspace when boot_acl is changed - thunderbolt: Use 64-bit DMA mask if supported by the platform - thunderbolt: Do not unnecessarily call ICM get route - thunderbolt: No need to take tb->lock in domain suspend/complete - thunderbolt: Use correct ICM commands in system suspend - thunderbolt: Add support for runtime PM * random oopses on s390 systems using NVMe devices (LP: #1790480) - s390/pci: fix out of bounds access during irq setup * [Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable) support for arm64 using SMC firmware call to set a hardware chicken bit (LP: #1787993) // CVE-2018-3639 (arm64) - arm64: alternatives: Add dynamic patching feature - KVM: arm/arm64: Do not use kern_hyp_va() with kvm_vgic_global_state - KVM: arm64: Avoid storing the vcpu pointer on the stack - arm/arm64: smccc: Add SMCCC-specific return codes - arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 - arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 - arm64: Add ARCH_WORKAROUND_2 probing - arm64: Add 'ssbd' command-line option - arm64: ssbd: Add global mitigation state accessor - arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation - arm64: ssbd: Restore mitigation status on CPU resume - arm64: ssbd: Introduce thread flag to control userspace mitigation - arm64: ssbd: Add prctl interface for per-thread mitigation - arm64: KVM: Add HYP per-cpu accessors - arm64: KVM: Add ARCH_WORKAROUND_2 support for guests - arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests - arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID - [Config] ARM64_SSBD=y * Reconcile hns3 SAUCE patches with upstream (LP: #1787477) - Revert "UBUNTU: SAUCE: net: hns3: Optimize PF CMDQ interrupt switching process" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox receiving unknown message" - Revert "UBUNTU: SAUCE: net: hns3: Fix for VF mailbox cannot receiving PF response"
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
** Also affects: linux-azure (Ubuntu) Importance: Undecided Status: New ** Changed in: linux-azure (Ubuntu Bionic) Status: New => Fix Committed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Status in linux-azure package in Ubuntu: New Status in linux source package in Bionic: In Progress Status in linux-azure source package in Bionic: Fix Committed Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Bionic) Status: New => In Progress ** Changed in: linux (Ubuntu Bionic) Assignee: (unassigned) => Marcelo Cerri (mhcerri) ** Changed in: linux (Ubuntu Bionic) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Status in linux source package in Bionic: In Progress Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
https://lists.ubuntu.com/archives/kernel-team/2018-August/095100.html -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
The above patch fixes the issue for me. Thanks -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
This has been submitted to 4.19 and stable:
For unsupported device types, the vmbus channel ringbuffer is never
initialized, and therefore reading the sysfs files will return garbage
or cause a kernel OOPS.
Fixes: c2e5df616e1a ("vmbus: add per-channel sysfs info")
** Patch added:
"0001-hv_vmbus-dont-return-values-for-uninitialized-channels.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+attachment/5182726/+files/0001-hv_vmbus-dont-return-values-for-uninitialized-channels.patch
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https://bugs.launchpad.net/bugs/1789638
Title:
azure 4.15 kernel: reading sysfs file causing oops
Status in linux package in Ubuntu:
Incomplete
Bug description:
Kernel: 4.15.0-1021-azure, in Xenial VM on Azure.
How to reproduce:
git clone git://kernel.ubuntu.com/cking/stress-ng
cd stress-ng
make
./stress-ng --sysfs 0 -t 120
One gets the following:
[ 22.451885] BUG: unable to handle kernel NULL pointer dereference at
0004
[ 22.455286] IP: read_avail_show+0x1c/0x40
[ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0
[ 22.455286] Oops: [#1] SMP PTI
[ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner
xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev
hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4
btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear
hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel
aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi
cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils
[ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure
#21~16.04.1-Ubuntu
[ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual
Machine, BIOS 090007 06/02/2017
[ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40
[ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286
[ 22.455286] RAX: RBX: 9db36c93e880 RCX:
9db36f136908
[ 22.860062] RDX: RSI: 9db364548000 RDI:
9db364548000
[ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09:
9db36c049840
[ 22.920041] R10: 9db364548000 R11: R12:
92ae9440
[ 22.948058] R13: 9db36c22d200 R14: 0001 R15:
9db36c93e880
[ 22.972043] FS: 7f67eeec6700() GS:9db37fd0()
knlGS:
[ 23.004046] CS: 0010 DS: ES: CR0: 80050033
[ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4:
001606e0
[ 23.048014] Call Trace:
[ 23.060019] vmbus_chan_attr_show+0x21/0x30
[ 23.076018] sysfs_kf_seq_show+0xa2/0x130
[ 23.088030] kernfs_seq_show+0x27/0x30
[ 23.100020] seq_read+0xb7/0x480
[ 23.112014] kernfs_fop_read+0x111/0x190
[ 23.128017] ? security_file_permission+0xa1/0xc0
[ 23.144013] __vfs_read+0x1b/0x40
[ 23.156019] vfs_read+0x93/0x130
[ 23.168013] SyS_read+0x55/0xc0
[ 23.180021] do_syscall_64+0x73/0x130
[ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[ 23.212022] RIP: 0033:0x7f67ee9d8260
[ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX:
[ 23.252022] RAX: ffda RBX: 0002 RCX:
7f67ee9d8260
[ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI:
0003
[ 23.300020] RBP: 0002 R08: R09:
[ 23.328025] R10: 037b R11: 0246 R12:
7f67eed0c000
[ 23.352036] R13: 0003 R14: R15:
0002
[ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00
00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48
04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6
[ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0
[ 23.468021] CR2: 0004
[ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]---
Cornered this down to just reading:
cat
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0
-24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail
There are various /sysfs VMBUS files that trigger this, see a fix on
comment #5 below that addresses all the ones I could find.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions
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[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
** Tags added: patch -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail There are various /sysfs VMBUS files that trigger this, see a fix on comment #5 below that addresses all the ones I could find. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
Workaround fix attached. I suspect there may be a more elegant solution. ** Patch added: "workaround fix" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+attachment/5182213/+files/0001-vmbus-check-for-null-ring-buffer-before-attempting-t.patch ** Description changed: Kernel: 4.15.0-1021-azure How to reproduce: - stress-ng --sysfs 0 -t 120 + git clone git://kernel.ubuntu.com/cking/stress-ng + cd stress-ng + make + ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 - [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 + [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 - [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 + [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail + + There are various /sysfs VMBUS files that trigger this, see a fix on + comment #5 below that addresses all the ones I could find. ** Description changed: - Kernel: 4.15.0-1021-azure + Kernel: 4.15.0-1021-azure, in Xenial VM on Azure. How to reproduce: git clone git://kernel.ubuntu.com/cking/stress-ng cd stress-ng make ./stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
Same issue with rbi->ring_buffer on write_avail_show() too. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure How to reproduce: stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
Tested with today's linux tip, 4.19.0-rc1 @ commit 3f16503b7d2274ac8cbab11163047ac0b4c66cfe, issue still occurs. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure How to reproduce: stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1789638] Re: azure 4.15 kernel: reading sysfs file causing oops
In read_avail_show, rbi->ring_buffer is NULL, causing the OOPS. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1789638 Title: azure 4.15 kernel: reading sysfs file causing oops Status in linux package in Ubuntu: Incomplete Bug description: Kernel: 4.15.0-1021-azure How to reproduce: stress-ng --sysfs 0 -t 120 One gets the following: [ 22.451885] BUG: unable to handle kernel NULL pointer dereference at 0004 [ 22.455286] IP: read_avail_show+0x1c/0x40 [ 22.455286] PGD 80042d59e067 P4D 80042d59e067 PUD 42eb8c067 PMD 0 [ 22.455286] Oops: [#1] SMP PTI [ 22.455286] Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security ip_tables x_tables serio_raw joydev hv_balloon ib_iser iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_fb hid_hyperv pata_acpi cfbfillrect hyperv_keyboard cfbimgblt hid cfbcopyarea hv_netvsc hv_utils [ 22.455286] CPU: 1 PID: 1670 Comm: cat Not tainted 4.15.0-1021-azure #21~16.04.1-Ubuntu [ 22.455286] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 22.455286] RIP: 0010:read_avail_show+0x1c/0x40 [ 22.455286] RSP: 0018:afa4c4eafdb0 EFLAGS: 00010286 [ 22.455286] RAX: RBX: 9db36c93e880 RCX: 9db36f136908 [ 22.860062] RDX: RSI: 9db364548000 RDI: 9db364548000 [ 22.888042] RBP: afa4c4eafdb0 R08: 9db364548000 R09: 9db36c049840 [ 22.920041] R10: 9db364548000 R11: R12: 92ae9440 [ 22.948058] R13: 9db36c22d200 R14: 0001 R15: 9db36c93e880 [ 22.972043] FS: 7f67eeec6700() GS:9db37fd0() knlGS: [ 23.004046] CS: 0010 DS: ES: CR0: 80050033 [ 23.024016] CR2: 0004 CR3: 00042c37a003 CR4: 001606e0 [ 23.048014] Call Trace: [ 23.060019] vmbus_chan_attr_show+0x21/0x30 [ 23.076018] sysfs_kf_seq_show+0xa2/0x130 [ 23.088030] kernfs_seq_show+0x27/0x30 [ 23.100020] seq_read+0xb7/0x480 [ 23.112014] kernfs_fop_read+0x111/0x190 [ 23.128017] ? security_file_permission+0xa1/0xc0 [ 23.144013] __vfs_read+0x1b/0x40 [ 23.156019] vfs_read+0x93/0x130 [ 23.168013] SyS_read+0x55/0xc0 [ 23.180021] do_syscall_64+0x73/0x130 [ 23.192014] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 23.212022] RIP: 0033:0x7f67ee9d8260 [ 23.224016] RSP: 002b:7fffdc193ff8 EFLAGS: 0246 ORIG_RAX: [ 23.252022] RAX: ffda RBX: 0002 RCX: 7f67ee9d8260 [ 23.276019] RDX: 0002 RSI: 7f67eed0c000 RDI: 0003 [ 23.300020] RBP: 0002 R08: R09: [ 23.328025] R10: 037b R11: 0246 R12: 7f67eed0c000 [ 23.352036] R13: 0003 R14: R15: 0002 [ 23.376678] Code: fb 3a 17 00 48 98 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 48 8b 87 38 01 00 00 49 89 f0 8b 97 48 01 00 00 4c 89 c7 48 89 e5 <8b> 48 04 8b 00 29 ca 89 c6 29 ce 01 c2 39 c1 0f 46 d6 48 c7 c6 [ 23.444022] RIP: read_avail_show+0x1c/0x40 RSP: afa4c4eafdb0 [ 23.468021] CR2: 0004 [ 23.481135] ---[ end trace 348a4b7d5a6747d1 ]--- Cornered this down to just reading: cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/99221fa0 -24ad-11e2-be98-001aa01bbf6e/channels/4/read_avail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1789638/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
