Public bug reported:
I am hitting the below kernel oops every 2-5 days on my home server box.
RIP is always "0010:btrfs_evict_inode+0xa1/0x480 [btrfs]" and address is
always "0000000000000068". I'm using btrfs in raid1 configuration for
general storage.
===
Feb 1 01:40:38 server kernel: [172867.493851] BUG: kernel NULL pointer
dereference, address: 0000000000000068
Feb 1 01:40:38 server kernel: [172867.493885] #PF: supervisor write access in
kernel mode
Feb 1 01:40:38 server kernel: [172867.493903] #PF: error_code(0x0002) -
not-present page
Feb 1 01:40:38 server kernel: [172867.493920] PGD 0 P4D 0
Feb 1 01:40:38 server kernel: [172867.493931] Oops: 0002 [#1] SMP PTI
Feb 1 01:40:38 server kernel: [172867.493946] CPU: 2 PID: 104 Comm: kswapd0
Not tainted 5.13.0-27-generic #29~20.04.1-Ubuntu
Feb 1 01:40:38 server kernel: [172867.493972] Hardware name: Gigabyte
Technology Co., Ltd. H67MA-D2H-B3/H67MA-D2H-B3, BIOS F1 02/11/2011
Feb 1 01:40:38 server kernel: [172867.493999] RIP:
0010:btrfs_evict_inode+0xa1/0x480 [btrfs]
Feb 1 01:40:38 server kernel: [172867.494070] Code: fd ff ff e8 d1 b1 9f c8 65
48 8b 04 25 c0 7b 01 00 48 89 45 b8 49 8b 84 24 f0 fd ff ff 48 85 c0 74 55 4d
8b b4 24 f8 fd ff ff <f0> 41 80 66 68 fe f0 41 80 66
68 f7 4c 89 f6 4c 89 ff e8 98 00 01
Feb 1 01:40:38 server kernel: [172867.494123] RSP: 0018:ffffab8dc042fad0
EFLAGS: 00010202
Feb 1 01:40:38 server kernel: [172867.494141] RAX: 0000000000000004 RBX:
ffff8f01001251d8 RCX: ffff8f0100125040
Feb 1 01:40:38 server kernel: [172867.494163] RDX: 00000000000000ff RSI:
0000000000000000 RDI: ffff8f01001251d0
Feb 1 01:40:38 server kernel: [172867.494185] RBP: ffffab8dc042fb28 R08:
0000000000000000 R09: 0000000000000000
Feb 1 01:40:38 server kernel: [172867.494206] R10: ffff8f00c2ea6280 R11:
0000000000000001 R12: ffff8f01001253c0
Feb 1 01:40:38 server kernel: [172867.494228] R13: ffff8f01001251d0 R14:
0000000000000000 R15: ffff8f01001251b0
Feb 1 01:40:38 server kernel: [172867.494250] FS: 0000000000000000(0000)
GS:ffff8f03cfa80000(0000) knlGS:0000000000000000
Feb 1 01:40:38 server kernel: [172867.494274] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Feb 1 01:40:38 server kernel: [172867.494293] CR2: 0000000000000068 CR3:
0000000202810001 CR4: 00000000000606e0
Feb 1 01:40:38 server kernel: [172867.494315] Call Trace:
Feb 1 01:40:38 server kernel: [172867.494328] evict+0xd2/0x180
Feb 1 01:40:38 server kernel: [172867.494342] dispose_list+0x39/0x50
Feb 1 01:40:38 server kernel: [172867.494356] prune_icache_sb+0x5c/0x80
Feb 1 01:40:38 server kernel: [172867.494370] super_cache_scan+0x132/0x1b0
Feb 1 01:40:38 server kernel: [172867.494386] do_shrink_slab+0x144/0x2c0
Feb 1 01:40:38 server kernel: [172867.494402] shrink_slab+0x215/0x2b0
Feb 1 01:40:38 server kernel: [172867.494416] shrink_node+0x2dd/0x6f0
Feb 1 01:40:38 server kernel: [172867.494430] balance_pgdat+0x322/0x5f0
Feb 1 01:40:38 server kernel: [172867.494445] kswapd+0x1f8/0x380
Feb 1 01:40:38 server kernel: [172867.494458] ? wait_woken+0x80/0x80
Feb 1 01:40:38 server kernel: [172867.494473] ? balance_pgdat+0x5f0/0x5f0
Feb 1 01:40:38 server kernel: [172867.494487] kthread+0x12b/0x150
Feb 1 01:40:38 server kernel: [172867.494501] ? set_kthread_struct+0x40/0x40
Feb 1 01:40:38 server kernel: [172867.494516] ret_from_fork+0x22/0x30
Feb 1 01:40:38 server kernel: [172867.494532] Modules linked in: xt_conntrack
xt_MASQUERADE nf_conntrack_netlink nfnetlink xfrm_user xfrm_algo xt_addrtype
iptable_filter iptable_nat nf_nat nf_conntrack nf_defra
g_ipv6 nf_defrag_ipv4 bpfilter br_netfilter bridge stp llc aufs overlay
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio
snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_code
c snd_hda_core snd_hwdep snd_pcm intel_rapl_msr snd_seq_midi snd_seq_midi_event
mei_hdcp intel_rapl_common x86_pkg_temp_thermal intel_powerclamp coretemp
snd_rawmidi kvm_intel kvm snd_seq crct10dif_pclmul ghash_
clmulni_intel snd_seq_device cryptd i915 rapl snd_timer intel_cstate serio_raw
joydev drm_kms_helper input_leds cec snd rc_core i2c_algo_bit fb_sys_fops
syscopyarea sysfillrect sysimgblt video soundcore mei_me m
ei mac_hid sch_fq_codel msr parport_pc ppdev drm lp parport ip_tables x_tables
autofs4 btrfs blake2b_generic xor zstd_compress raid6_pq libcrc32c uas
usb_storage hid_generic usbhid hid
Feb 1 01:40:38 server kernel: [172867.494581] gpio_ich crc32_pclmul lpc_ich
r8169 i2c_i801 ahci i2c_smbus xhci_pci realtek libahci xhci_pci_renesas
Feb 1 01:40:38 server kernel: [172867.497076] CR2: 0000000000000068
Feb 1 01:40:38 server kernel: [172867.497876] ---[ end trace 4ab76c62441acb52
]---
Feb 1 01:40:38 server kernel: [172867.498695] RIP:
0010:btrfs_evict_inode+0xa1/0x480 [btrfs]
Feb 1 01:40:38 server kernel: [172867.499556] Code: fd ff ff e8 d1 b1 9f c8 65
48 8b 04 25 c0 7b 01 00 48 89 45 b8 49 8b 84 24 f0 fd ff ff 48 85 c0 74 55 4d
8b b4 24 f8 fd ff ff <f0> 41 80 66 68 fe f0 41 80 66 68 f7 4c 89 f6 4c 89 ff e8
98 00 01
Feb 1 01:40:38 server kernel: [172867.501356] RSP: 0018:ffffab8dc042fad0
EFLAGS: 00010202
Feb 1 01:40:38 server kernel: [172867.502297] RAX: 0000000000000004 RBX:
ffff8f01001251d8 RCX: ffff8f0100125040
Feb 1 01:40:38 server kernel: [172867.503243] RDX: 00000000000000ff RSI:
0000000000000000 RDI: ffff8f01001251d0
Feb 1 01:40:38 server kernel: [172867.504204] RBP: ffffab8dc042fb28 R08:
0000000000000000 R09: 0000000000000000
Feb 1 01:40:38 server kernel: [172867.505177] R10: ffff8f00c2ea6280 R11:
0000000000000001 R12: ffff8f01001253c0
Feb 1 01:40:38 server kernel: [172867.506172] R13: ffff8f01001251d0 R14:
0000000000000000 R15: ffff8f01001251b0
Feb 1 01:40:38 server kernel: [172867.507165] FS: 0000000000000000(0000)
GS:ffff8f03cfa80000(0000) knlGS:0000000000000000
Feb 1 01:40:38 server kernel: [172867.508183] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Feb 1 01:40:38 server kernel: [172867.509210] CR2: 0000000000000068 CR3:
0000000202810001 CR4: 00000000000606e0
===
More instances of the same report is in the attached file.
I /think/ I didn't see these crashes while I was running 5.11 kernels.
Will switch back to linux-image-5.11.0-46-generic and see if the crashes
go away.
Attached is the output of
$ cd /var/log
$ (cat kern.log kern.log.1; zcat kern.log.{2,3,4}.gz) | grep -B10 -A50 "BUG:" >
~/kern.log
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "kern.log"
https://bugs.launchpad.net/bugs/1959685/+attachment/5558621/+files/kern.log
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https://bugs.launchpad.net/bugs/1959685
Title:
Kernel BUG with btrfs on linux 5.13
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