I'm sad to say, but it seems it did not fix our problem. The crash happened again after running for about an hour:
[ 4914.661585] BUG: unable to handle page fault for address: ffffffffffffffb0 [ 4914.661620] #PF: supervisor read access in kernel mode [ 4914.661638] #PF: error_code(0x0000) - not-present page [ 4914.661656] PGD 1b6580e067 P4D 1b6580e067 PUD 1b65810067 PMD 0 [ 4914.661680] Oops: 0000 [#1] SMP NOPTI [ 4914.661695] CPU: 12 PID: 4840 Comm: kworker/u130:5 Tainted: P OE 5.4.0-39-generic #43-Ubuntu [ 4914.661725] Hardware name: GIGABYTE G291-Z20-00/MZ21-G20-00, BIOS F06 10/04/2019 [ 4914.661770] Workqueue: rpciod rpc_async_schedule [sunrpc] [ 4914.661803] RIP: 0010:nfs4_get_valid_delegation+0xd/0x30 [nfsv4] [ 4914.661824] Code: 89 ef e8 76 0f ce ff e9 ec fd ff ff 90 0f 1f 44 00 00 55 48 89 e5 f0 80 4f 48 08 5d c3 0f 1f 44 00 00 55 31 f6 48 89 e5 41 54 <4c> 8b 67 b0 4c 89 e7 e8 07 f9 ff ff 84 c0 b8 00 00 00 00 4c 0f 44 [ 4914.661879] RSP: 0018:ffffa0c1e0193d98 EFLAGS: 00010246 [ 4914.661898] RAX: ffff8b35bd8400c0 RBX: ffff8b3dc849f000 RCX: 0000000000000000 [ 4914.661920] RDX: 0000000000008000 RSI: 0000000000000000 RDI: 0000000000000000 [ 4914.661942] RBP: ffffa0c1e0193da0 R08: 0000000000000000 R09: 8080808080808080 [ 4914.661965] R10: ffff8b3da8b397ac R11: 0000000000000018 R12: ffff8b3d93417300 [ 4914.661988] R13: 0000000000000000 R14: ffff8b45ccf6e000 R15: ffffffffc0696950 [ 4914.662011] FS: 0000000000000000(0000) GS:ffff8b3dcf900000(0000) knlGS:0000000000000000 [ 4914.662036] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4914.662056] CR2: ffffffffffffffb0 CR3: 00000007df20e000 CR4: 00000000003406e0 [ 4914.662078] Call Trace: [ 4914.662101] nfs4_open_prepare+0x89/0x1e0 [nfsv4] [ 4914.662128] rpc_prepare_task+0x1f/0x30 [sunrpc] [ 4914.662154] __rpc_execute+0x8c/0x3a0 [sunrpc] [ 4914.662179] rpc_async_schedule+0x30/0x50 [sunrpc] [ 4914.662199] process_one_work+0x1eb/0x3b0 [ 4914.662215] worker_thread+0x4d/0x400 [ 4914.662230] kthread+0x104/0x140 [ 4914.662244] ? process_one_work+0x3b0/0x3b0 [ 4914.662259] ? kthread_park+0x90/0x90 [ 4914.662275] ret_from_fork+0x1f/0x40 [ 4914.662290] Modules linked in: rpcsec_gss_krb5 auth_rpcgss md4 cmac nfsv4 nls_utf8 cifs nfs libarc4 lockd grace libdes fscache aufs overlay ipmi_ssif binfmt_misc snd_hda_codec_hdmi amd64_edac_mod edac_mce_amd kvm_amd nls_iso8859_1 kvm snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi ucsi_ccg snd_seq_midi_event typec_ucsi typec snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore k10temp ccp ipmi_si mac_hid nvidia_uvm(OE) sch_fq_codel parport_pc ppdev lp parport sunrpc ip_tables x_tables autofs4 mlx5_ib nvidia_drm(POE) nvidia_modeset(POE) ib_uverbs ib_core nvidia(POE) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ast drm_vram_helper i2c_algo_bit ttm aesni_intel mlx5_core drm_kms_helper ixgbe syscopyarea crypto_simd sysfillrect nvme sysimgblt fb_sys_fops pci_hyperv_intf cryptd xfrm_algo dca glue_helper mdio drm tls nvme_core ahci mlxfw libahci ipmi_devintf i2c_piix4 ipmi_msghandler i2c_nvidia_gpu [ 4914.662566] CR2: ffffffffffffffb0 [ 4914.662581] ---[ end trace cdb67bb8c51af6b1 ]--- [ 4914.662608] RIP: 0010:nfs4_get_valid_delegation+0xd/0x30 [nfsv4] [ 4914.663407] Code: 89 ef e8 76 0f ce ff e9 ec fd ff ff 90 0f 1f 44 00 00 55 48 89 e5 f0 80 4f 48 08 5d c3 0f 1f 44 00 00 55 31 f6 48 89 e5 41 54 <4c> 8b 67 b0 4c 89 e7 e8 07 f9 ff ff 84 c0 b8 00 00 00 00 4c 0f 44 [ 4914.665002] RSP: 0018:ffffa0c1e0193d98 EFLAGS: 00010246 [ 4914.665836] RAX: ffff8b35bd8400c0 RBX: ffff8b3dc849f000 RCX: 0000000000000000 [ 4914.666646] RDX: 0000000000008000 RSI: 0000000000000000 RDI: 0000000000000000 [ 4914.667858] RBP: ffffa0c1e0193da0 R08: 0000000000000000 R09: 8080808080808080 [ 4914.669136] R10: ffff8b3da8b397ac R11: 0000000000000018 R12: ffff8b3d93417300 [ 4914.670414] R13: 0000000000000000 R14: ffff8b45ccf6e000 R15: ffffffffc0696950 [ 4914.671692] FS: 0000000000000000(0000) GS:ffff8b3dcf900000(0000) knlGS:0000000000000000 [ 4914.672980] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4914.674267] CR2: ffffffffffffffb0 CR3: 00000007df20e000 CR4: 00000000003406e0 This was with (env) orexplore@sleipner:~$ uname -a Linux sleipner 5.4.0-39-generic #43-Ubuntu SMP Fri Jun 19 10:28:31 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux (env) orexplore@sleipner:~$ from linux-image-5.4.0-39-generic 5.4.0-39.43 in focal-proposed. -- 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/1885010 Title: NULL deference in nfs4_get_valid_delegation Status in linux package in Ubuntu: Fix Committed Bug description: We are getting the following on an NFSv4 client running focal (kernel 5.4.0-33.37): [296787.347971] BUG: unable to handle page fault for address: ffffffffffffffb0 [296787.350255] #PF: supervisor read access in kernel mode [296787.352315] #PF: error_code(0x0000) - not-present page [296787.354137] PGD 15bf00e067 P4D 15bf00e067 PUD 15bf010067 PMD 0 [296787.355798] Oops: 0000 [#2] SMP NOPTI [296787.357271] CPU: 49 PID: 605315 Comm: kworker/u131:3 Tainted: P D OE 5.4.0-33-generic #37-Ubuntu [296787.358756] Hardware name: GIGABYTE G291-Z20-00/MZ21-G20-00, BIOS F06 10/04/2019 [296787.360274] Workqueue: rpciod rpc_async_schedule [sunrpc] [296787.361790] RIP: 0010:nfs4_get_valid_delegation+0xd/0x30 [nfsv4] [296787.363281] Code: 89 ef e8 06 c0 f9 ff e9 ec fd ff ff 90 0f 1f 44 00 00 55 48 89 e5 f0 80 4f 48 08 5d c3 0f 1f 44 00 00 55 31 f6 48 89 e5 41 54 <4c> 8b 67 b0 4c 89 e7 e8 07 f9 ff ff 84 c0 b8 00 00 00 00 4c 0f 44 [296787.366780] RSP: 0018:ffffb7b1634a7d98 EFLAGS: 00010246 [296787.368740] RAX: ffff9ef2958e9b00 RBX: ffff9ef59f910000 RCX: 0000000000000000 [296787.370648] RDX: 0000000000008000 RSI: 0000000000000000 RDI: 0000000000000000 [296787.372559] RBP: ffffb7b1634a7da0 R08: 0000000000000000 R09: 8080808080808080 [296787.374441] R10: ffff9ef731e9d26c R11: 0000000000000018 R12: ffff9ef781f22600 [296787.376330] R13: 0000000000000000 R14: ffff9efe1db4bc00 R15: ffffffffc0cc2950 [296787.378220] FS: 0000000000000000(0000) GS:ffff9ef78fc40000(0000) knlGS:0000000000000000 [296787.380165] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [296787.382076] CR2: ffffffffffffffb0 CR3: 0000001a2799c000 CR4: 00000000003406e0 [296787.384031] Call Trace: [296787.385985] nfs4_open_prepare+0x89/0x1e0 [nfsv4] [296787.387973] rpc_prepare_task+0x1f/0x30 [sunrpc] [296787.389971] __rpc_execute+0x8c/0x3a0 [sunrpc] [296787.391903] rpc_async_schedule+0x30/0x50 [sunrpc] [296787.393787] process_one_work+0x1eb/0x3b0 [296787.395617] worker_thread+0x4d/0x400 [296787.397431] kthread+0x104/0x140 [296787.399166] ? process_one_work+0x3b0/0x3b0 [296787.400868] ? kthread_park+0x90/0x90 [296787.402518] ret_from_fork+0x1f/0x40 [296787.404158] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace sunrpc xt_nat xt_tcpudp veth xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xt_addrtype iptable_filter iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c bpfilter br_netfilter bridge stp llc aufs overlay md4 cmac nls_utf8 cifs libarc4 fscache libdes binfmt_misc snd_hda_codec_hdmi amd64_edac_mod edac_mce_amd ipmi_ssif nls_iso8859_1 kvm_amd kvm snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_seq_midi snd_seq_midi_event snd_hda_core snd_rawmidi snd_hwdep snd_pcm snd_seq snd_seq_device snd_timer ucsi_ccg snd typec_ucsi typec soundcore k10temp ccp ipmi_si mac_hid nvidia_uvm(OE) sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 mlx5_ib nvidia_drm(POE) nvidia_modeset(POE) ib_uverbs ib_core nvidia(POE) crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ast drm_vram_helper aesni_intel i2c_algo_bit crypto_simd ixgbe cryptd ttm glue_helper xfrm_algo [296787.404232] drm_kms_helper mlx5_core dca mdio syscopyarea sysfillrect sysimgblt fb_sys_fops nvme pci_hyperv_intf drm tls nvme_core mlxfw ahci ipmi_devintf i2c_piix4 libahci ipmi_msghandler i2c_nvidia_gpu [296787.421858] CR2: ffffffffffffffb0 [296787.423680] ---[ end trace 2cf3edda87955a36 ]--- [296787.425547] RIP: 0010:nfs4_get_valid_delegation+0xd/0x30 [nfsv4] [296787.427389] Code: 89 ef e8 06 c0 f9 ff e9 ec fd ff ff 90 0f 1f 44 00 00 55 48 89 e5 f0 80 4f 48 08 5d c3 0f 1f 44 00 00 55 31 f6 48 89 e5 41 54 <4c> 8b 67 b0 4c 89 e7 e8 07 f9 ff ff 84 c0 b8 00 00 00 00 4c 0f 44 [296787.431172] RSP: 0018:ffffb7b1615e3d98 EFLAGS: 00010246 [296787.433050] RAX: ffff9ee9faf45ec0 RBX: ffff9ef16c5dd000 RCX: 0000000000000000 [296787.434922] RDX: 0000000000008000 RSI: 0000000000000000 RDI: 0000000000000000 [296787.436810] RBP: ffffb7b1615e3da0 R08: 0000000000000000 R09: 8080808080808080 [296787.438673] R10: ffff9ef26a0b8c6c R11: 0000000000000018 R12: ffff9ef7817cfa00 [296787.440539] R13: 0000000000000004 R14: ffff9ef8bdeb0400 R15: ffffffffc0cc2950 [296787.442400] FS: 0000000000000000(0000) GS:ffff9ef78fc40000(0000) knlGS:0000000000000000 [296787.444289] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [296787.446126] CR2: ffffffffffffffb0 CR3: 0000001a2799c000 CR4: 00000000003406e0 The problem is a known issue which has been fixed upstream: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29fe839976266bc7c55b927360a1daae57477723 The patch is a simple 2 line fix. Would be great if you could do an SRU and add that upstream patch. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1885010/+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
