[Kernel-packages] [Bug 1886277] Re: Regression on NFS: unable to handle page fault in mempool_alloc_slab
5.4.0-48-generic seems to have fixed this problem 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/1886277 Title: Regression on NFS: unable to handle page fault in mempool_alloc_slab Status in linux package in Ubuntu: Fix Released Status in linux source package in Focal: Fix Released Bug description: On kernel 5.4.0-40-generic in focal I'm getting errors like this on several machines with different hardware in the first hour after boot: Jul 04 16:58:32 hostname kernel: BUG: unable to handle page fault for address: 9083e222e632 Jul 04 16:58:32 hostname kernel: #PF: supervisor read access in kernel mode Jul 04 16:58:32 hostname kernel: #PF: error_code(0x) - not-present page Jul 04 16:58:32 hostname kernel: PGD 3ac205067 P4D 3ac205067 PUD 0 Jul 04 16:58:32 hostname kernel: Oops: [#1] SMP NOPTI Jul 04 16:58:32 hostname kernel: CPU: 4 PID: 289 Comm: kworker/u16:4 Tainted: G OE 5.4.0-40-generic #44-Ubuntu Jul 04 16:58:32 hostname kernel: Hardware name: LENOVO 20N2CTO1WW/20N2CTO1WW, BIOS N2IET88W (1.66 ) 04/22/2020 Jul 04 16:58:32 hostname kernel: Workqueue: rpciod rpc_async_schedule [sunrpc] Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c1436a94 Jul 04 16:58:32 hostname kernel: R10: 908368178d2c R11: 0018 R12: 9083e222e632 Jul 04 16:58:32 hostname kernel: R13: 00092800 R14: 908367ca6140 R15: 908367ca6140 Jul 04 16:58:32 hostname kernel: FS: () GS:90836c30() knlGS: Jul 04 16:58:32 hostname kernel: CS: 0010 DS: ES: CR0: 80050033 Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 CR3: 0003ab80a003 CR4: 003606e0 Jul 04 16:58:32 hostname kernel: Call Trace: Jul 04 16:58:32 hostname kernel: ? mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc+0x64/0x180 Jul 04 16:58:32 hostname kernel: rpc_malloc+0xa1/0xb0 [sunrpc] Jul 04 16:58:32 hostname kernel: call_allocate+0xd1/0x1b0 [sunrpc] Jul 04 16:58:32 hostname kernel: ? call_refreshresult+0x100/0x100 [sunrpc] Jul 04 16:58:32 hostname kernel: __rpc_execute+0x8c/0x3a0 [sunrpc] Jul 04 16:58:32 hostname kernel: rpc_async_schedule+0x30/0x50 [sunrpc] Jul 04 16:58:32 hostname kernel: process_one_work+0x1eb/0x3b0 Jul 04 16:58:32 hostname kernel: worker_thread+0x4d/0x400 Jul 04 16:58:32 hostname kernel: kthread+0x104/0x140 Jul 04 16:58:32 hostname kernel: ? process_one_work+0x3b0/0x3b0 Jul 04 16:58:32 hostname kernel: ? kthread_park+0x90/0x90 Jul 04 16:58:32 hostname kernel: ret_from_fork+0x35/0x40 Jul 04 16:58:32 hostname kernel: Modules linked in: rfcomm rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) msr ccm cmac algif_hash algif_skcipher af_alg aufs bnep overlay nls_iso8859_1 mei_hdcp intel_rapl_msr snd_s> Jul 04 16:58:32 hostname kernel: nvram ledtrig_audio mei_me cfg80211 mei processor_thermal_device snd_seq ucsi_acpi typec_ucsi intel_rapl_common intel_soc_dts_iosf snd_seq_device typec intel_pch_thermal snd_timer snd int3403_thermal soundcore int340x_thermal_zone i> Jul 04 16:58:32 hostname kernel: pinctrl_cannonlake video pinctrl_intel Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 Jul 04 16:58:32 hostname kernel: ---[ end trace cbbaed921eb439ce ]--- Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c1436a94 Jul 04 16:58:32 hostname kernel: R10: 908368178d2c R11: 0018 R12: 9083e222e6
[Kernel-packages] [Bug 1886277] Re: Regression on NFS: unable to handle page fault in mempool_alloc_slab
For what it is worth, I also have the same enncryption aes256-cts-hmac- sha1-96 (and same problem). The tickets come from MIT Kerberos on Ubuntu 18.04; the NFS servers are Ubuntu 18.04 using krb5p security option. -- 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/1886277 Title: Regression on NFS: unable to handle page fault in mempool_alloc_slab Status in linux package in Ubuntu: Confirmed Bug description: On kernel 5.4.0-40-generic in focal I'm getting errors like this on several machines with different hardware in the first hour after boot: Jul 04 16:58:32 hostname kernel: BUG: unable to handle page fault for address: 9083e222e632 Jul 04 16:58:32 hostname kernel: #PF: supervisor read access in kernel mode Jul 04 16:58:32 hostname kernel: #PF: error_code(0x) - not-present page Jul 04 16:58:32 hostname kernel: PGD 3ac205067 P4D 3ac205067 PUD 0 Jul 04 16:58:32 hostname kernel: Oops: [#1] SMP NOPTI Jul 04 16:58:32 hostname kernel: CPU: 4 PID: 289 Comm: kworker/u16:4 Tainted: G OE 5.4.0-40-generic #44-Ubuntu Jul 04 16:58:32 hostname kernel: Hardware name: LENOVO 20N2CTO1WW/20N2CTO1WW, BIOS N2IET88W (1.66 ) 04/22/2020 Jul 04 16:58:32 hostname kernel: Workqueue: rpciod rpc_async_schedule [sunrpc] Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c1436a94 Jul 04 16:58:32 hostname kernel: R10: 908368178d2c R11: 0018 R12: 9083e222e632 Jul 04 16:58:32 hostname kernel: R13: 00092800 R14: 908367ca6140 R15: 908367ca6140 Jul 04 16:58:32 hostname kernel: FS: () GS:90836c30() knlGS: Jul 04 16:58:32 hostname kernel: CS: 0010 DS: ES: CR0: 80050033 Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 CR3: 0003ab80a003 CR4: 003606e0 Jul 04 16:58:32 hostname kernel: Call Trace: Jul 04 16:58:32 hostname kernel: ? mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc+0x64/0x180 Jul 04 16:58:32 hostname kernel: rpc_malloc+0xa1/0xb0 [sunrpc] Jul 04 16:58:32 hostname kernel: call_allocate+0xd1/0x1b0 [sunrpc] Jul 04 16:58:32 hostname kernel: ? call_refreshresult+0x100/0x100 [sunrpc] Jul 04 16:58:32 hostname kernel: __rpc_execute+0x8c/0x3a0 [sunrpc] Jul 04 16:58:32 hostname kernel: rpc_async_schedule+0x30/0x50 [sunrpc] Jul 04 16:58:32 hostname kernel: process_one_work+0x1eb/0x3b0 Jul 04 16:58:32 hostname kernel: worker_thread+0x4d/0x400 Jul 04 16:58:32 hostname kernel: kthread+0x104/0x140 Jul 04 16:58:32 hostname kernel: ? process_one_work+0x3b0/0x3b0 Jul 04 16:58:32 hostname kernel: ? kthread_park+0x90/0x90 Jul 04 16:58:32 hostname kernel: ret_from_fork+0x35/0x40 Jul 04 16:58:32 hostname kernel: Modules linked in: rfcomm rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) msr ccm cmac algif_hash algif_skcipher af_alg aufs bnep overlay nls_iso8859_1 mei_hdcp intel_rapl_msr snd_s> Jul 04 16:58:32 hostname kernel: nvram ledtrig_audio mei_me cfg80211 mei processor_thermal_device snd_seq ucsi_acpi typec_ucsi intel_rapl_common intel_soc_dts_iosf snd_seq_device typec intel_pch_thermal snd_timer snd int3403_thermal soundcore int340x_thermal_zone i> Jul 04 16:58:32 hostname kernel: pinctrl_cannonlake video pinctrl_intel Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 Jul 04 16:58:32 hostname kernel: ---[ end trace cbbaed921eb439ce ]--- Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c1436a94 Jul 04
[Kernel-packages] [Bug 1886775] Re: kernel 5.4.0-40 hangs system when using nfs home directories
#3: Agreed that it is a duplicate of lp: #1886277 . Sorry, I looked for similar bugs but did a lousy job it appears. I just made a comment to this effect in #1886277. #2: I believe the apport files are attached in comment #1, though it is the first time I have used it and may be confusing it. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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/1886775 Title: kernel 5.4.0-40 hangs system when using nfs home directories Status in linux package in Ubuntu: Confirmed Bug description: We use nfs mounted (using autofs), kerberos authenticated home directories for most users. Booting with kernel 5.4.0-40, users with nfs mounted home directories find the system freezes not long after use, somewhat randomly. Power off is then the only thing to do. Some specific things that caused crashes - opening a second tab on firefox; opening a terminal and running "cat" on log files, and running ubuntu-bug linux to try to generate this report :-( Sometimes before the crash just one window freezes, and the rest of the GUI is responsive. A full freeze usually occurs within several seconds. No such crashes were observed using an account without nfs mounted home directories (and the output from "ubuntu-bug linux" for one of these working users is at the end of this report). Reverting to 5.4.0-39, everything is good. Exactly the same behaviour is observed on a modern AMD Zen2 processor with a graphics card, and a several year old Intel processor with integrated graphics. Looking at /var/log/syslog there are several suspicious messages like the one below. The general protection fault occurs always just before the freeze, and occasionally some times before. Jul 4 16:23:37 emu kernel: [ 350.263903] [ cut here ] Jul 4 16:23:37 emu kernel: [ 350.263904] virt_to_cache: Object is not a Slab page! Jul 4 16:23:37 emu kernel: [ 350.263917] WARNING: CPU: 13 PID: 4009 at mm/slab.h:473 kmem_cache_free+0x237/0x2b0 Jul 4 16:23:37 emu kernel: [ 350.263917] Modules linked in: rfcomm rpcsec_gss_krb5 nfsv4 nfs fscache vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) edac_mce_amd kvm_amd xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter bpfilter cmac algif_hash algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nvidia_uvm(OE) kvm nvidia_drm(POE) nvidia_modeset(POE) iwlmvm snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg snd_hda_codec nls_iso8859_1 snd_hda_core snd_hwdep snd_pcm btusb btrtl btbcm btintel snd_seq_midi mac80211 bluetooth snd_seq_midi_event crct10dif_pclmul snd_rawmidi bridge ecdh_generic stp ghash_clmulni_intel llc libarc4 input_leds joydev ecc nvidia(POE) snd_seq iwlwifi aesni_intel crypto_simd cryptd glue_helper drm_kms_helper snd_seq_device cfg80211 snd_timer ipmi_devintf Jul 4 16:23:37 emu kernel: [ 350.263952] wmi_bmof ipmi_msghandler snd fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore k10temp ccp mac_hid sch_fq_codel parport_pc ppdev lp parport drm nfsd nfs_acl auth_rpcgss lockd grace sunrpc ip_tables x_tables autofs4 hid_generic usbhid hid crc32_pclmul igb i2c_piix4 ahci i2c_algo_bit nvme libahci dca nvme_core wmi Jul 4 16:23:37 emu kernel: [ 350.263971] CPU: 13 PID: 4009 Comm: kworker/u64:4 Tainted: P OE 5.4.0-40-generic #44-Ubuntu Jul 4 16:23:37 emu kernel: [ 350.263972] Hardware name: Gigabyte Technology Co., Ltd. X570 I AORUS PRO WIFI/X570 I AORUS PRO WIFI, BIOS F4h 07/17/2019 Jul 4 16:23:37 emu kernel: [ 350.263986] Workqueue: rpciod rpc_async_schedule [sunrpc] Jul 4 16:23:37 emu kernel: [ 350.263989] RIP: 0010:kmem_cache_free+0x237/0x2b0 Jul 4 16:23:37 emu kernel: [ 350.263990] Code: ff ff ff 80 3d 16 4f 56 01 00 0f 85 39 ff ff ff 48 c7 c6 20 44 67 86 48 c7 c7 08 25 98 86 c6 05 fb 4e 56 01 01 e8 64 8a df ff <0f> 0b e9 18 ff ff ff 48 8b 57 58 49 8b 4f 58 48 c7 c6 30 44 67 86 Jul 4 16:23:37 emu kernel: [ 350.263991] RSP: 0018:c1ebc3077d20 EFLAGS: 00010282 Jul 4 16:23:37 emu kernel: [ 350.263993] RAX: RBX: a040c01358e2 RCX: 0006 Jul 4 16:23:37 emu kernel: [ 350.263993] RDX: 0007 RSI: 0092 RDI: a040beb578c0 Jul 4 16:23:37 emu kernel: [ 350.263994] RBP: c1ebc3077d48 R08: 0506 R09: 0004 Jul 4 16:23:37 emu kernel: [ 350.263995] R10: R11: 0001 R12: a041401358e2 Jul 4 16:23:37 emu kernel: [ 350.263995] R13: R14: a040a7e47600 R15: a04065a99cb0 Jul 4 16:23:37 emu kernel: [ 35
[Kernel-packages] [Bug 1886277] Re: unable to handle page fault in mempool_alloc_slab
I also have this problem, which I reported as a new bug 1886775 which is probably just a duplicate of this bug. Same issue, -40 dies with NFS with similar stack trace and similar timing, -39 is fine, and multiple hardware has the identical issues. -- 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/1886277 Title: unable to handle page fault in mempool_alloc_slab Status in linux package in Ubuntu: Incomplete Bug description: On kernel 5.4.0-40-generic in focal I'm getting errors like this on several machines with different hardware in the first hour after boot: Jul 04 16:58:32 hostname kernel: BUG: unable to handle page fault for address: 9083e222e632 Jul 04 16:58:32 hostname kernel: #PF: supervisor read access in kernel mode Jul 04 16:58:32 hostname kernel: #PF: error_code(0x) - not-present page Jul 04 16:58:32 hostname kernel: PGD 3ac205067 P4D 3ac205067 PUD 0 Jul 04 16:58:32 hostname kernel: Oops: [#1] SMP NOPTI Jul 04 16:58:32 hostname kernel: CPU: 4 PID: 289 Comm: kworker/u16:4 Tainted: G OE 5.4.0-40-generic #44-Ubuntu Jul 04 16:58:32 hostname kernel: Hardware name: LENOVO 20N2CTO1WW/20N2CTO1WW, BIOS N2IET88W (1.66 ) 04/22/2020 Jul 04 16:58:32 hostname kernel: Workqueue: rpciod rpc_async_schedule [sunrpc] Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c1436a94 Jul 04 16:58:32 hostname kernel: R10: 908368178d2c R11: 0018 R12: 9083e222e632 Jul 04 16:58:32 hostname kernel: R13: 00092800 R14: 908367ca6140 R15: 908367ca6140 Jul 04 16:58:32 hostname kernel: FS: () GS:90836c30() knlGS: Jul 04 16:58:32 hostname kernel: CS: 0010 DS: ES: CR0: 80050033 Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 CR3: 0003ab80a003 CR4: 003606e0 Jul 04 16:58:32 hostname kernel: Call Trace: Jul 04 16:58:32 hostname kernel: ? mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc_slab+0x17/0x20 Jul 04 16:58:32 hostname kernel: mempool_alloc+0x64/0x180 Jul 04 16:58:32 hostname kernel: rpc_malloc+0xa1/0xb0 [sunrpc] Jul 04 16:58:32 hostname kernel: call_allocate+0xd1/0x1b0 [sunrpc] Jul 04 16:58:32 hostname kernel: ? call_refreshresult+0x100/0x100 [sunrpc] Jul 04 16:58:32 hostname kernel: __rpc_execute+0x8c/0x3a0 [sunrpc] Jul 04 16:58:32 hostname kernel: rpc_async_schedule+0x30/0x50 [sunrpc] Jul 04 16:58:32 hostname kernel: process_one_work+0x1eb/0x3b0 Jul 04 16:58:32 hostname kernel: worker_thread+0x4d/0x400 Jul 04 16:58:32 hostname kernel: kthread+0x104/0x140 Jul 04 16:58:32 hostname kernel: ? process_one_work+0x3b0/0x3b0 Jul 04 16:58:32 hostname kernel: ? kthread_park+0x90/0x90 Jul 04 16:58:32 hostname kernel: ret_from_fork+0x35/0x40 Jul 04 16:58:32 hostname kernel: Modules linked in: rfcomm rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) msr ccm cmac algif_hash algif_skcipher af_alg aufs bnep overlay nls_iso8859_1 mei_hdcp intel_rapl_msr snd_s> Jul 04 16:58:32 hostname kernel: nvram ledtrig_audio mei_me cfg80211 mei processor_thermal_device snd_seq ucsi_acpi typec_ucsi intel_rapl_common intel_soc_dts_iosf snd_seq_device typec intel_pch_thermal snd_timer snd int3403_thermal soundcore int340x_thermal_zone i> Jul 04 16:58:32 hostname kernel: pinctrl_cannonlake video pinctrl_intel Jul 04 16:58:32 hostname kernel: CR2: 9083e222e632 Jul 04 16:58:32 hostname kernel: ---[ end trace cbbaed921eb439ce ]--- Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230 Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb Jul 04 16:58:32 hostname kernel: RSP: 0018:bc38c046fcc8 EFLAGS: 00010282 Jul 04 16:58:32 hostname kernel: RAX: 9083e222e632 RBX: RCX: 0002 Jul 04 16:58:32 hostname kernel: RDX: 0009 RSI: 00092800 RDI: 00031fb0 Jul 04 16:58:32 hostname kernel: RBP: bc38c046fcf8 R08: 90836c331fb0 R09: c14
[Kernel-packages] [Bug 1886775] [NEW] kernel 5.4.0-40 hangs system when using nfs home directories
Public bug reported: We use nfs mounted (using autofs), kerberos authenticated home directories for most users. Booting with kernel 5.4.0-40, users with nfs mounted home directories find the system freezes not long after use, somewhat randomly. Power off is then the only thing to do. Some specific things that caused crashes - opening a second tab on firefox; opening a terminal and running "cat" on log files, and running ubuntu-bug linux to try to generate this report :-( Sometimes before the crash just one window freezes, and the rest of the GUI is responsive. A full freeze usually occurs within several seconds. No such crashes were observed using an account without nfs mounted home directories (and the output from "ubuntu-bug linux" for one of these working users is at the end of this report). Reverting to 5.4.0-39, everything is good. Exactly the same behaviour is observed on a modern AMD Zen2 processor with a graphics card, and a several year old Intel processor with integrated graphics. Looking at /var/log/syslog there are several suspicious messages like the one below. The general protection fault occurs always just before the freeze, and occasionally some times before. Jul 4 16:23:37 emu kernel: [ 350.263903] [ cut here ] Jul 4 16:23:37 emu kernel: [ 350.263904] virt_to_cache: Object is not a Slab page! Jul 4 16:23:37 emu kernel: [ 350.263917] WARNING: CPU: 13 PID: 4009 at mm/slab.h:473 kmem_cache_free+0x237/0x2b0 Jul 4 16:23:37 emu kernel: [ 350.263917] Modules linked in: rfcomm rpcsec_gss_krb5 nfsv4 nfs fscache vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) edac_mce_amd kvm_amd xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter bpfilter cmac algif_hash algif_skcipher af_alg bnep snd_hda_codec_hdmi binfmt_misc nvidia_uvm(OE) kvm nvidia_drm(POE) nvidia_modeset(POE) iwlmvm snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg snd_hda_codec nls_iso8859_1 snd_hda_core snd_hwdep snd_pcm btusb btrtl btbcm btintel snd_seq_midi mac80211 bluetooth snd_seq_midi_event crct10dif_pclmul snd_rawmidi bridge ecdh_generic stp ghash_clmulni_intel llc libarc4 input_leds joydev ecc nvidia(POE) snd_seq iwlwifi aesni_intel crypto_simd cryptd glue_helper drm_kms_helper snd_seq_device cfg80211 snd_timer ipmi_devintf Jul 4 16:23:37 emu kernel: [ 350.263952] wmi_bmof ipmi_msghandler snd fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore k10temp ccp mac_hid sch_fq_codel parport_pc ppdev lp parport drm nfsd nfs_acl auth_rpcgss lockd grace sunrpc ip_tables x_tables autofs4 hid_generic usbhid hid crc32_pclmul igb i2c_piix4 ahci i2c_algo_bit nvme libahci dca nvme_core wmi Jul 4 16:23:37 emu kernel: [ 350.263971] CPU: 13 PID: 4009 Comm: kworker/u64:4 Tainted: P OE 5.4.0-40-generic #44-Ubuntu Jul 4 16:23:37 emu kernel: [ 350.263972] Hardware name: Gigabyte Technology Co., Ltd. X570 I AORUS PRO WIFI/X570 I AORUS PRO WIFI, BIOS F4h 07/17/2019 Jul 4 16:23:37 emu kernel: [ 350.263986] Workqueue: rpciod rpc_async_schedule [sunrpc] Jul 4 16:23:37 emu kernel: [ 350.263989] RIP: 0010:kmem_cache_free+0x237/0x2b0 Jul 4 16:23:37 emu kernel: [ 350.263990] Code: ff ff ff 80 3d 16 4f 56 01 00 0f 85 39 ff ff ff 48 c7 c6 20 44 67 86 48 c7 c7 08 25 98 86 c6 05 fb 4e 56 01 01 e8 64 8a df ff <0f> 0b e9 18 ff ff ff 48 8b 57 58 49 8b 4f 58 48 c7 c6 30 44 67 86 Jul 4 16:23:37 emu kernel: [ 350.263991] RSP: 0018:c1ebc3077d20 EFLAGS: 00010282 Jul 4 16:23:37 emu kernel: [ 350.263993] RAX: RBX: a040c01358e2 RCX: 0006 Jul 4 16:23:37 emu kernel: [ 350.263993] RDX: 0007 RSI: 0092 RDI: a040beb578c0 Jul 4 16:23:37 emu kernel: [ 350.263994] RBP: c1ebc3077d48 R08: 0506 R09: 0004 Jul 4 16:23:37 emu kernel: [ 350.263995] R10: R11: 0001 R12: a041401358e2 Jul 4 16:23:37 emu kernel: [ 350.263995] R13: R14: a040a7e47600 R15: a04065a99cb0 Jul 4 16:23:37 emu kernel: [ 350.263997] FS: () GS:a040beb4() knlGS: Jul 4 16:23:37 emu kernel: [ 350.263997] CS: 0010 DS: ES: CR0: 80050033 Jul 4 16:23:37 emu kernel: [ 350.263998] CR2: 7fe66802dfe0 CR3: 000717722000 CR4: 00340ee0 Jul 4 16:23:37 emu kernel: [ 350.263999] Call Trace: Jul 4 16:23:37 emu kernel: [ 350.264005] mempool_free_slab+0x17/0x20 Jul 4 16:23:37 emu kernel: [ 350.264007] mempool_free+0x2f/0x80 Jul 4 16:23:37 emu kernel: [ 350.264018] rpc_free+0x47/0x60 [sunrpc] Jul 4 16:23:37 emu kernel: [ 350.264028] xprt_release+0x91/0x1a0 [sunrpc] Jul 4 16:23:37 emu kernel: [ 350.264037] rpc_release_resources_task+0x13/0x50 [sunrp
