This bug was fixed in the package linux - 4.15.0-48.51
---------------
linux (4.15.0-48.51) bionic; urgency=medium
* linux: 4.15.0-48.51 -proposed tracker (LP: #1822820)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
- [Packaging] resync retpoline extraction
* 3b080b2564287be91605bfd1d5ee985696e61d3c in ubuntu_btrfs_kernel_fixes
triggers system hang on i386 (LP: #1812845)
- btrfs: raid56: properly unmap parity page in finish_parity_scrub()
* [P9][LTCTest][Opal][FW910] cpupower monitor shows multiple stop Idle_Stats
(LP: #1719545)
- cpupower : Fix header name to read idle state name
* [amdgpu] screen corruption when using touchpad (LP: #1818617)
- drm/amdgpu/gmc: steal the appropriate amount of vram for fw hand-over (v3)
- drm/amdgpu: Free VGA stolen memory as soon as possible.
* [SRU][B/C/OEM]IOMMU: add kernel dma protection (LP: #1820153)
- ACPICA: AML parser: attempt to continue loading table after error
- ACPI / property: Allow multiple property compatible _DSD entries
- PCI / ACPI: Identify untrusted PCI devices
- iommu/vt-d: Force IOMMU on for platform opt in hint
- iommu/vt-d: Do not enable ATS for untrusted devices
- thunderbolt: Export IOMMU based DMA protection support to userspace
- iommu/vt-d: Disable ATS support on untrusted devices
* Add basic support to NVLink2 passthrough (LP: #1819989)
- powerpc/powernv/npu: Do not try invalidating 32bit table when 64bit table
is
enabled
- powerpc/powernv: call OPAL_QUIESCE before OPAL_SIGNAL_SYSTEM_RESET
- powerpc/powernv: Export opal_check_token symbol
- powerpc/powernv: Make possible for user to force a full ipl cec reboot
- powerpc/powernv/idoa: Remove unnecessary pcidev from pci_dn
- powerpc/powernv: Move npu struct from pnv_phb to pci_controller
- powerpc/powernv/npu: Move OPAL calls away from context manipulation
- powerpc/pseries/iommu: Use memory@ nodes in max RAM address calculation
- powerpc/pseries/npu: Enable platform support
- powerpc/pseries: Remove IOMMU API support for non-LPAR systems
- powerpc/powernv/npu: Check mmio_atsd array bounds when populating
- powerpc/powernv/npu: Fault user page into the hypervisor's pagetable
* Huawei Hi1822 NIC has poor performance (LP: #1820187)
- net-next: hinic: fix a problem in free_tx_poll()
- hinic: remove ndo_poll_controller
- net-next/hinic: add checksum offload and TSO support
- hinic: Fix l4_type parameter in hinic_task_set_tunnel_l4
- net-next/hinic:replace multiply and division operators
- net-next/hinic:add rx checksum offload for HiNIC
- net-next/hinic:fix a bug in set mac address
- net-next/hinic: fix a bug in rx data flow
- net: hinic: fix null pointer dereference on pointer hwdev
- hinic: optmize rx refill buffer mechanism
- net-next/hinic:add shutdown callback
- net-next/hinic: replace disable_irq_nosync/enable_irq
* [CONFIG] please enable highdpi font FONT_TER16x32 (LP: #1819881)
- Fonts: New Terminus large console font
- [Config]: enable highdpi Terminus 16x32 font support
* [19.04 FEAT] qeth: Enhanced link speed - kernel part (LP: #1814892)
- s390/qeth: report 25Gbit link speed
* CVE-2017-5754
- x86/nmi: Fix NMI uaccess race against CR3 switching
- x86/mm: Fix documentation of module mapping range with 4-level paging
- x86/pti: Enable global pages for shared areas
- x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image
- x86/pti: Leave kernel text global for !PCID
- x86/pti: Fix boot problems from Global-bit setting
- x86/pti: Fix boot warning from Global-bit setting
- x86/pti: Reduce amount of kernel text allowed to be Global
- x86/pti: Disallow global kernel text with RANDSTRUCT
- x86/entry/32: Add explicit 'l' instruction suffix
- x86/asm-offsets: Move TSS_sp0 and TSS_sp1 to asm-offsets.c
- x86/entry/32: Rename TSS_sysenter_sp0 to TSS_entry2task_stack
- x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
- x86/entry/32: Put ESPFIX code into a macro
- x86/entry/32: Unshare NMI return path
- x86/entry/32: Split off return-to-kernel path
- x86/entry/32: Enter the kernel via trampoline stack
- x86/entry/32: Leave the kernel via trampoline stack
- x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI
- x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack
- x86/entry/32: Simplify debug entry point
- x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points
- x86/entry/32: Add PTI CR3 switches to NMI handler code
- x86/entry: Rename update_sp0 to update_task_stack
- x86/pgtable: Rename pti_set_user_pgd() to pti_set_user_pgtbl()
- x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled
- x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
- x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h
- x86/pgtable: Move pti_set_user_pgtbl() to pgtable.h
- x86/pgtable: Move two more functions from pgtable_64.h to pgtable.h
- x86/mm/pae: Populate valid user PGD entries
- x86/mm/pae: Populate the user page-table with user pgd's
- x86/mm/pti: Add an overflow check to pti_clone_pmds()
- x86/mm/pti: Define X86_CR3_PTI_PCID_USER_BIT on x86_32
- x86/mm/pti: Clone CPU_ENTRY_AREA on PMD level on x86_32
- x86/mm/pti: Make pti_clone_kernel_text() compile on 32 bit
- x86/mm/pti: Keep permissions when cloning kernel text in
pti_clone_kernel_text()
- x86/mm/pti: Introduce pti_finalize()
- x86/mm/pti: Clone entry-text again in pti_finalize()
- x86/mm/dump_pagetables: Define INIT_PGD
- x86/pgtable/pae: Use separate kernel PMDs for user page-table
- x86/ldt: Reserve address-space range on 32 bit for the LDT
- x86/ldt: Define LDT_END_ADDR
- x86/ldt: Split out sanity check in map_ldt_struct()
- x86/ldt: Enable LDT user-mapping for PAE
- x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
- [Config] Update PAGE_TABLE_ISOLATION annotations
- x86/mm/pti: Add Warning when booting on a PCID capable CPU
- x86/entry/32: Add debug code to check entry/exit CR3
- x86/pti: Check the return value of pti_user_pagetable_walk_p4d()
- x86/pti: Check the return value of pti_user_pagetable_walk_pmd()
- perf/core: Make sure the ring-buffer is mapped in all page-tables
- x86/entry/32: Check for VM86 mode in slow-path check
- x86/mm: Remove in_nmi() warning from vmalloc_fault()
- x86/kexec: Allocate 8k PGDs for PTI
- x86/mm/pti: Clear Global bit more aggressively
- mm: Allow non-direct-map arguments to free_reserved_area()
- x86/mm/init: Pass unconverted symbol addresses to free_init_pages()
- x86/mm/init: Add helper for freeing kernel image pages
- x86/mm/init: Remove freed kernel image areas from alias mapping
- x86/mm/pti: Fix 32 bit PCID check
- x86/mm/pti: Don't clear permissions in pti_clone_pmd()
- x86/mm/pti: Clone kernel-image on PTE level for 32 bit
- x86/relocs: Add __end_rodata_aligned to S_REL
- x86/mm/pti: Move user W+X check into pti_finalize()
- x86/efi: Load fixmap GDT in efi_call_phys_epilog()
- x86/efi: Load fixmap GDT in efi_call_phys_epilog() before setting %cr3
- x86/mm/doc: Clean up the x86-64 virtual memory layout descriptions
- x86/mm/doc: Enhance the x86-64 virtual memory layout descriptions
- x86/entry/32: Clear the CS high bits
- x86/mm: Move LDT remap out of KASLR region on 5-level paging
- x86/ldt: Unmap PTEs for the slot before freeing LDT pages
- x86/ldt: Remove unused variable in map_ldt_struct()
- x86/mm: Fix guard hole handling
- x86/dump_pagetables: Fix LDT remap address marker
* Avoid potential memory corruption on HiSilicon SoCs (LP: #1819546)
- iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI payloads
* Ubuntu18.04.01: [Power9] power8 Compat guest(RHEL7.6) crashes during guest
boot with > 256G of memory (kernel/kvm) (LP: #1818645)
- ]PATCH] KVM: PPC: Book3S HV: Don't truncate HPTE index in xlate function
* Fix for dual Intel NVMes (LP: #1821961)
- SAUCE: nvme: Merge two quirk entries into one for Intel 760p/Pro 7600p
* CVE-2017-5715
- tools headers: Synchronize prctl.h ABI header
- x86/spectre: Add missing family 6 check to microcode check
- x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
- x86/speculation: Apply IBPB more strictly to avoid cross-process data leak
- x86/speculation: Propagate information about RSB filling mitigation to
sysfs
- x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL_NOSPEC
variant
- x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support
- x86/retpoline: Remove minimal retpoline support
- x86/speculation: Update the TIF_SSBD comment
- x86/speculation: Clean up spectre_v2_parse_cmdline()
- x86/speculation: Remove unnecessary ret variable in cpu_show_common()
- x86/speculation: Move STIPB/IBPB string conditionals out of
cpu_show_common()
- x86/speculation: Disable STIBP when enhanced IBRS is in use
- x86/speculation: Rename SSBD update functions
- x86/speculation: Reorganize speculation control MSRs update
- sched/smt: Make sched_smt_present track topology
- x86/Kconfig: Select SCHED_SMT if SMP enabled
- sched/smt: Expose sched_smt_present static key
- x86/speculation: Rework SMT state change
- x86/l1tf: Show actual SMT state
- x86/speculation: Reorder the spec_v2 code
- x86/speculation: Mark string arrays const correctly
- x86/speculataion: Mark command line parser data __initdata
- x86/speculation: Unify conditional spectre v2 print functions
- x86/speculation: Add command line control for indirect branch speculation
- x86/speculation: Prepare for per task indirect branch speculation control
- x86/process: Consolidate and simplify switch_to_xtra() code
- x86/speculation: Avoid __switch_to_xtra() calls
- x86/speculation: Prepare for conditional IBPB in switch_mm()
- ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS
- x86/speculation: Split out TIF update
- x86/speculation: Prevent stale SPEC_CTRL msr content
- x86/speculation: Prepare arch_smt_update() for PRCTL mode
- x86/speculation: Add prctl() control for indirect branch speculation
- x86/speculation: Enable prctl mode for spectre_v2_user
- x86/speculation: Add seccomp Spectre v2 user space protection mode
- x86/speculation: Provide IBPB always command line options
- kvm: svm: Ensure an IBPB on all affected CPUs when freeing a vmcb
- x86/speculation: Change misspelled STIPB to STIBP
- x86/speculation: Add support for STIBP always-on preferred mode
- x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE
- s390: remove closung punctuation from spectre messages
- x86/speculation: Simplify the CPU bug detection logic
* CVE-2018-3639
- x86/bugs: Add AMD's variant of SSB_NO
- x86/bugs: Add AMD's SPEC_CTRL MSR usage
- x86/bugs: Switch the selection of mitigation from CPU vendor to CPU
features
- x86/bugs: Update when to check for the LS_CFG SSBD mitigation
- x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR
- KVM: x86: SVM: Call x86_spec_ctrl_set_guest/host() with interrupts
disabled
* [Ubuntu] vfio-ap: add subsystem to matrix device to avoid libudev failures
(LP: #1818854)
- s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem
* Kernel regularly logs: Bluetooth: hci0: last event is not cmd complete
(0x0f) (LP: #1748565)
- Bluetooth: Fix unnecessary error message for HCI request completion
* HiSilicon HNS ethernet broken in 4.15.0-45 (LP: #1818294)
- net: hns: Fix WARNING when hns modules installed
* rtl8723be wifi does not work under linux-modules-extra-4.15.0-33-generic
(LP: #1788997)
- SAUCE: Revert "rtlwifi: cleanup 8723be ant_sel definition"
* Crash from :i915 module with 4.15.0-46-generic using multi-display
(LP: #1819486)
- SAUCE: Revert "drm/i915: Fix hotplug irq ack on i965/g4x"
* kernel linux-image-4.15.0-44 not booting on Hyperv Server 2008R2
(LP: #1814069)
- hv/netvsc: fix handling of fallback to single queue mode
- hv/netvsc: Fix NULL dereference at single queue mode fallback
* Lenovo ideapad 330-15ICH Wifi rfkill hard blocked (LP: #1811815)
- platform/x86: ideapad: Add ideapad 330-15ICH to no_hw_rfkill
* Qualcomm Atheros QCA9377 wireless does not work (LP: #1818204)
- platform/x86: ideapad-laptop: Add Ideapad 530S-14ARR to no_hw_rfkill list
* fscache: jobs might hang when fscache disk is full (LP: #1821395)
- fscache: fix race between enablement and dropping of object
* hns3: fix oops in hns3_clean_rx_ring() (LP: #1821064)
- net: hns3: add dma_rmb() for rx description
* Hard lockup in 2 CPUs due to deadlock in cpu_stoppers (LP: #1821259)
- stop_machine: Disable preemption after queueing stopper threads
- stop_machine: Atomically queue and wake stopper threads
* tcm_loop.ko: move from modules-extra into main modules package
(LP: #1817786)
- [Packaging] move tcm_loop.lo to main linux-modules package
* tcmu user space crash results in kernel module hang. (LP: #1819504)
- scsi: tcmu: delete unused __wait
- scsi: tcmu: track nl commands
- scsi: tcmu: simplify nl interface
- scsi: tcmu: add module wide block/reset_netlink support
* Intel XL710 - i40e driver does not work with kernel 4.15 (Ubuntu 18.04)
(LP: #1779756)
- i40e: Fix for Tx timeouts when interface is brought up if DCB is enabled
- i40e: prevent overlapping tx_timeout recover
* some codecs stop working after S3 (LP: #1820930)
- ALSA: hda - Enforces runtime_resume after S3 and S4 for each codec
* i40e xps management broken when > 64 queues/cpus (LP: #1820948)
- i40e: Do not allow use more TC queue pairs than MSI-X vectors exist
- i40e: Fix the number of queues available to be mapped for use
* 4.15 s390x kernel BUG at /build/linux-
Gycr4Z/linux-4.15.0/drivers/block/virtio_blk.c:565! (LP: #1788432)
- virtio/s390: avoid race on vcdev->config
- virtio/s390: fix race in ccw_io_helper()
* [SRU][B/B-OEM/C/D] Fix AMD IOMMU NULL dereference (LP: #1820990)
- iommu/amd: Fix NULL dereference bug in match_hid_uid
* New Intel Wireless-AC 9260 [8086:2526] card not correctly probed in Ubuntu
system (LP: #1821271)
- iwlwifi: add new card for 9260 series
* Add support for MAC address pass through on RTL8153-BD (LP: #1821276)
- r8152: Add support for MAC address pass through on RTL8153-BD
- r8152: Fix an error on RTL8153-BD MAC Address Passthrough support
-- Andrea Righi <[email protected]> Tue, 02 Apr 2019 18:31:55
+0200
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5754
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-3639
--
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https://bugs.launchpad.net/bugs/1788432
Title:
4.15 s390x kernel BUG at /build/linux-
Gycr4Z/linux-4.15.0/drivers/block/virtio_blk.c:565!
Status in Ubuntu on IBM z Systems:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released
Bug description:
[SRU Justification]
== Impact ==
Several helper functions in the s390x code which handle accessing sysfs
attributes were missing protection against races. Concurrent access would be
able to trigger kernel bugs.
== Fix ==
The following two upstream commits (from v5.0 upstream) will fix the issue:
78b1a52e05c9 virtio/s390: fix race in ccw_io_helper()
2448a299ec41 virtio/s390: avoid race on vcdev->config
== Testcase ==
see below
== Risk of Regression ==
Changes are isolated to architecture code and are verified by running the
stress testing, so overall should be low.
uname -a
Linux ckingvm1 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 13:42:17 UTC 2018
s390x s390x s390x GNU/Linux
and same for 4.15.0-29-generic and 4.17.0-8-generic
Steps to reproduce this bug:
git clone git://kernel.ubuntu.com/cking/stress-ng
cd stress-ng
make clean
make
And run with:
./stress-ng --sysfs 0 -t 60
.. wait a few seconds and then:
[ 119.445891] ------------[ cut here ]------------
[ 119.445898] kernel BUG at
/build/linux-Gycr4Z/linux-4.15.0/drivers/block/virtio_blk.c:565!
[ 119.446093] illegal operation: 0001 ilc:1 [#3] SMP
[ 119.446100] Modules linked in: binfmt_misc zfs(PO) zunicode(PO) zavl(PO)
icp(PO) isofs zcommon(PO) znvpair(PO) spl(O) ghash_s390 prng aes_s390 des_s390
des_generic vfio_ccw sha512_s390 sha256_s390 vfio_mdev sha1_s390 sha_common
mdev vfio_iommu_type1 vfio sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nfsd auth_rpcgss nfs_acl
lockd grace sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate raid10
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
libcrc32c raid1 raid0 linear virtio_net crc32_vx_s390 virtio_blk
[ 119.446166] CPU: 1 PID: 5420 Comm: stress-ng-sysfs Tainted: P D O
4.15.0-33-generic #36-Ubuntu
[ 119.446168] Hardware name: IBM 2964 N63 400 (KVM/Linux)
[ 119.446170] Krnl PSW : 0000000012d313d3 00000000405835bc
(virtblk_cache_type_show+0x82/0x88 [virtio_blk])
[ 119.446177] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0
RI:0 EA:3
[ 119.446194] Krnl GPRS: de6dc5c2779af7d7 000000007ffaba20 0000000000000040
0000000000006545
[ 119.446196] 000003ff800058da 0000000000006546 000000006bf537c0
000000006b60a100
[ 119.446198] 0000000000000000 0000000000690648 000000007cc3de40
000000007a74b000
[ 119.446202] 000003ff80008210 0000000000000000 000003ff800058da
000000007ac1bce8
[ 119.446210] Krnl Code: 000003ff80005912: ebbff0a80004 lmg
%r11,%r15,168(%r15)
[ 119.446210] 000003ff80005918: c0f400000560 brcl
15,3ff800063d8
[ 119.446210] #000003ff8000591e: a7f40001 brc
15,3ff80005920
[ 119.446210] >000003ff80005922: 0707 bcr 0,%r7
[ 119.446210] 000003ff80005924: 0707 bcr 0,%r7
[ 119.446210] 000003ff80005926: 0707 bcr 0,%r7
[ 119.446210] 000003ff80005928: c00400000000 brcl
0,3ff80005928
[ 119.446210] 000003ff8000592e: eb6ff0480024 stmg
%r6,%r15,72(%r15)
[ 119.446226] Call Trace:
[ 119.446229] ([<000003ff800058da>] virtblk_cache_type_show+0x3a/0x88
[virtio_blk])
[ 119.446234] [<0000000000690684>] dev_attr_show+0x3c/0x80
[ 119.446240] [<0000000000424ab4>] sysfs_kf_seq_show+0xbc/0x1a8
[ 119.446259] [<00000000003b048c>] seq_read+0xec/0x4c8
[ 119.446262] [<00000000003821ea>] vfs_read+0x8a/0x150
[ 119.446274] [<0000000000382786>] SyS_read+0x66/0xe0
[ 119.446278] [<00000000008e3028>] system_call+0xdc/0x2c8
[ 119.446279] Last Breaking-Event-Address:
[ 119.446281] [<000003ff8000591e>] virtblk_cache_type_show+0x7e/0x88
[virtio_blk]
[ 119.446283]
[ 119.446284] ---[ end trace 2c2403d726047e4a ]---
For 4.17.0-8-generic:
[ 25.170715] kernel BUG at drivers/block/virtio_blk.c:574!
[ 25.170795] illegal operation: 0001 ilc:1 [#1] SMP
[ 25.170797] Modules linked in: lttng_statedump(OE) lttng_clock(OE)
lttng_lib_ring_buffer(OE) binfmt_misc zfs(PO) zunicode(PO) zavl(PO) icp(PO)
isofs zcommon(PO) znvpair(PO) spl(O) ghash_s390 prng aes_s390 des_s390
des_generic sha512_s390 sha256_s390 sha1_s390 sha_common vfio_ccw vfio_mdev
mdev vfio_iommu_type1 vfio sch_fq_codel ib_iser rdma_cm iw_cm ib_cm nfsd
ib_core auth_rpcgss iscsi_tcp nfs_acl lockd grace libiscsi_tcp libiscsi
scsi_transport_iscsi sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor
raid6_pq libcrc32c raid1 raid0 linear virtio_net virtio_blk crc32_vx_s390
[ 25.170835] CPU: 0 PID: 5590 Comm: stress-ng-sysfs Tainted: P OE
4.17.0-8-generic #9-Ubuntu
[ 25.170837] Hardware name: IBM 2964 N63 400 (KVM/Linux)
[ 25.170839] Krnl PSW : 0000000005f0c968 0000000026542d57
(virtblk_cache_type_show+0x7c/0x80 [virtio_blk])
[ 25.170846] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0
RI:0 EA:3
[ 25.170849] Krnl GPRS: de6dc5c209bf9e6f 000000007ff91320 0000000000000040
0000000000000891
[ 25.170850] 0000000000000000 0000000000000892 0000000000000000
000000007176e800
[ 25.170852] 000000006f447f00 0000000000684300 000000006f492b40
000000006ca7a000
[ 25.170853] 000003ff80018218 000000007b5e6e40 000003ff8001561a
000000006f447ce8
[ 25.170861] Krnl Code: 000003ff8001564c: ebbff0a80004 lmg
%r11,%r15,168(%r15)
[ 25.170861] 000003ff80015652: c0f40000065b brcl
15,3ff80016308
[ 25.170861] #000003ff80015658: a7f40001 brc
15,3ff8001565a
[ 25.170861] >000003ff8001565c: 0707 bcr 0,%r7
[ 25.170861] 000003ff8001565e: 0707 bcr 0,%r7
[ 25.170861] 000003ff80015660: c00400000000 brcl
0,3ff80015660
[ 25.170861] 000003ff80015666: eb6ff0480024 stmg
%r6,%r15,72(%r15)
[ 25.170861] 000003ff8001566c: a7f13f80 tmll
%r15,16256
[ 25.170878] Call Trace:
[ 25.170881] ([<000003ff8001561a>] virtblk_cache_type_show+0x3a/0x80
[virtio_blk])
[ 25.170888] [<000000000068433c>] dev_attr_show+0x3c/0x78
[ 25.170895] [<000000000042539c>] sysfs_kf_seq_show+0xbc/0x1a0
[ 25.170899] [<00000000003b16b8>] seq_read+0x180/0x4f8
[ 25.170903] [<000000000038433a>] vfs_read+0x8a/0x148
[ 25.170905] [<0000000000384882>] ksys_read+0x62/0xd0
[ 25.170909] [<00000000008db738>] system_call+0xdc/0x2c8
[ 25.170910] Last Breaking-Event-Address:
[ 25.170912] [<000003ff80015658>] virtblk_cache_type_show+0x78/0x80
[virtio_blk]
[ 25.170913]
[ 25.170914] ---[ end trace 14f89544f0f55795 ]---
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