On Fri, 2019-09-20 at 14:23 -0400, Nick Bowler wrote: > Hi all, > > I hit this oops on Linux 5.3 yesterday. The crash itself occurred > while > compiling Linux (source and build dirs on NFS). Afterwards, the > system > remained mostly alive but my NFS mounts became very busted with lots > (but not all) I/O operations appearing to hang forever. > > Not sure how reproducible this is. Since I've never seen a crash > like this before it may be a regression compared to, say, Linux 4.19 > but I am not certain because this particular machine is brand new so > I don't have experience with older kernels on it... > > Full dmesg is attached (gzipped). > > Let me know if you need any more info. > > [ 796.050025] BUG: kernel NULL pointer dereference, address: > 0000000000000014 > [ 796.051280] #PF: supervisor read access in kernel mode > [ 796.053063] #PF: error_code(0x0000) - not-present page > [ 796.054636] PGD 0 P4D 0 > [ 796.055688] Oops: 0000 [#1] PREEMPT SMP > [ 796.056768] CPU: 2 PID: 190 Comm: kworker/2:2 Tainted: G W > 5.3.0 #6 > [ 796.057953] Hardware name: To Be Filled By O.E.M. To Be Filled By > O.E.M./B450 Gaming-ITX/ac, BIOS P3.30 05/17/2019 > [ 796.059329] Workqueue: events key_garbage_collector > [ 796.060623] RIP: 0010:keyring_gc_check_iterator+0x27/0x30 That would be the keyring garbage collector, not NFS. Cced keyrings@xxxxxxxxxxxxxxx > [ 796.061845] Code: 44 00 00 48 83 e7 fc b8 01 00 00 00 f6 87 80 00 > 00 00 21 75 19 48 8b 57 58 48 39 16 7c 05 48 85 d2 7f 0b 48 8b 87 a0 > 00 00 00 <0f> b6 40 14 c3 0f 1f 40 00 48 83 e7 fc e9 27 eb ff ff 0f > 1f > 80 00 > [ 796.064638] RSP: 0018:ffffb40fc0757df8 EFLAGS: 00010282 > [ 796.066058] RAX: 0000000000000000 RBX: ffffa14338caed80 RCX: > ffffb40fc0757e40 > [ 796.067531] RDX: ffffa1433ae85558 RSI: ffffb40fc0757e40 RDI: > ffffa1433ae85500 > [ 796.069014] RBP: ffffb40fc0757e40 R08: 0000000000000000 R09: > 000000000000000f > [ 796.070513] R10: 8080808080808080 R11: 0000000000000001 R12: > ffffffffa4cd6180 > [ 796.072025] R13: ffffa14338caee10 R14: ffffa14338caedf0 R15: > ffffa1433ffeff00 > [ 796.073567] FS: 0000000000000000(0000) GS:ffffa14340480000(0000) > knlGS:0000000000000000 > [ 796.075171] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 796.076785] CR2: 0000000000000014 CR3: 0000000747ce6000 CR4: > 00000000003406e0 > [ 796.078445] Call Trace: > [ 796.080091] assoc_array_subtree_iterate+0x55/0x100 > [ 796.081770] keyring_gc+0x3f/0x80 > [ 796.083447] key_garbage_collector+0x330/0x3d0 > [ 796.085155] process_one_work+0x1cb/0x320 > [ 796.086869] worker_thread+0x28/0x3c0 > [ 796.088603] ? process_one_work+0x320/0x320 > [ 796.090335] kthread+0x106/0x120 > [ 796.092053] ? kthread_create_on_node+0x40/0x40 > [ 796.093810] ret_from_fork+0x1f/0x30 > [ 796.095569] Modules linked in: sha1_ssse3 sha1_generic cbc cts > rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace ext4 crc16 mbcache > jbd2 iwlmvm mac80211 libarc4 amdgpu iwlwifi snd_hda_codec_realtek > snd_hda_codec_generic kvm_amd gpu_sched kvm snd_hda_codec_hdmi > drm_kms_helper irqbypass k10temp syscopyarea sysfillrect sysimgblt > fb_sys_fops video ttm cfg80211 snd_hda_intel snd_hda_codec drm > snd_hwdep rfkill snd_hda_core backlight snd_pcm evdev snd_timer snd > soundcore efivarfs dm_crypt hid_generic igb hwmon i2c_algo_bit sr_mod > cdrom sunrpc dm_mod > [ 796.104033] CR2: 0000000000000014 > [ 796.106304] ---[ end trace 695aee10f9202347 ]--- > [ 796.108585] RIP: 0010:keyring_gc_check_iterator+0x27/0x30 > [ 796.110894] Code: 44 00 00 48 83 e7 fc b8 01 00 00 00 f6 87 80 00 > 00 00 21 75 19 48 8b 57 58 48 39 16 7c 05 48 85 d2 7f 0b 48 8b 87 a0 > 00 00 00 <0f> b6 40 14 c3 0f 1f 40 00 48 83 e7 fc e9 27 eb ff ff 0f > 1f > 80 00 > [ 796.115773] RSP: 0018:ffffb40fc0757df8 EFLAGS: 00010282 > [ 796.118209] RAX: 0000000000000000 RBX: ffffa14338caed80 RCX: > ffffb40fc0757e40 > [ 796.120683] RDX: ffffa1433ae85558 RSI: ffffb40fc0757e40 RDI: > ffffa1433ae85500 > [ 796.123176] RBP: ffffb40fc0757e40 R08: 0000000000000000 R09: > 000000000000000f > [ 796.125668] R10: 8080808080808080 R11: 0000000000000001 R12: > ffffffffa4cd6180 > [ 796.128104] R13: ffffa14338caee10 R14: ffffa14338caedf0 R15: > ffffa1433ffeff00 > [ 796.130493] FS: 0000000000000000(0000) GS:ffffa14340480000(0000) > knlGS:0000000000000000 > [ 796.132923] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 796.135266] CR2: 0000000000000014 CR3: 0000000747ce6000 CR4: > 00000000003406e0 > > Thanks, > Nick -- Trond Myklebust Linux NFS client maintainer, Hammerspace trond.myklebust@xxxxxxxxxxxxxxx
