kernel oops on bcachefs umount, 6.7 kernel

Tony Asleson
2024-02-01T21:53:10Z

Fedora 39 with 6.7 kernel with bcachefs support

Steps
1. I created the bcachefs (using locally compiled git repo
f15633cce1b79e708e9debc21c7b8772df7c7a29)
# bcachefs format --replicas=2 /dev/sd[bcdej]
2. mounted FS and wrote some files to it
3. I removed one of the virtual disk drives from the VM, (/dev/sdj)
while the VM was running
4. I wrote some more data to bcachefs FS
5. unmounted the bcachefs FS

Got the following oops

....
[90806.970165] bcachefs (sdj): error writing journal entry 429: I/O
[90808.112301] bcachefs (sdj): error writing journal entry 430: I/O
[90808.122558] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18584, nr_sectors = 16 limit=0
[90808.122565] bcachefs (sdj): error writing journal entry 430: I/O
[90809.200254] bcachefs (sdj): error writing journal entry 431: I/O
[90810.287776] bcachefs (sdj): error writing journal entry 432: I/O
[90810.298269] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18600, nr_sectors = 16 limit=0
[90810.298274] bcachefs (sdj): error writing journal entry 432: I/O
[90811.439700] bcachefs (sdj): error writing journal entry 433: I/O
[90811.450090] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18616, nr_sectors = 16 limit=0
[90811.450094] bcachefs (sdj): error writing journal entry 433: I/O
[90812.528102] bcachefs (sdj): error writing journal entry 434: I/O
[90812.538847] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18632, nr_sectors = 16 limit=0
[90812.538854] bcachefs (sdj): error writing journal entry 434: I/O
[90813.616108] bcachefs (sdj): error writing journal entry 435: I/O
[90813.627032] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18648, nr_sectors = 16 limit=0
[90813.627043] bcachefs (sdj): error writing journal entry 435: I/O
[90814.768088] bcachefs (sdj): error writing journal entry 436: I/O
[90816.112053] bcachefs (sdj): error writing journal entry 437: I/O
[90816.114579] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18664, nr_sectors = 16 limit=0
[90816.114584] bcachefs (sdj): error writing journal entry 437: I/O
[90817.264105] bcachefs (sdj): error writing journal entry 438: I/O
[90817.276368] kworker/2:0H: attempt to access beyond end of device
sdj: rw=137217, sector=18680, nr_sectors = 16 limit=0
[90817.276373] bcachefs (sdj): error writing journal entry 438: I/O
[90849.997509] bcachefs (sdj): error writing journal entry 439: I/O
[90850.010057] kworker/1:1H: attempt to access beyond end of device
sdj: rw=137217, sector=18696, nr_sectors = 8 limit=0
[90850.010062] bcachefs (sdj): error writing journal entry 439: I/O
[90850.012743] umount: attempt to access beyond end of device
sdj: rw=6144, sector=8, nr_sectors = 8 limit=0
[90850.012747] bcachefs (sdj): superblock read error: I/O
[90850.013664] ------------[ cut here ]------------
[90850.013666] kernfs: can not remove 'bcachefs', no directory
[90850.013671] WARNING: CPU: 4 PID: 6892 at fs/kernfs/dir.c:1662
kernfs_remove_by_name_ns+0xba/0xc0
[90850.013678] Modules linked in: binfmt_misc bcachefs lz4hc_compress
lz4_compress bcache nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rfkill
ip_set nf_tables nfnetlink vfat fat snd_pcm snd_timer intel_rapl_msr
snd intel_rapl_common soundcore hv_netvsc hv_utils pcspkr hv_balloon
joydev fuse loop zram xfs crct10dif_pclmul crc32_pclmul crc32c_intel
polyval_clmulni serio_raw hv_storvsc polyval_generic scsi_transport_fc
hyperv_drm hyperv_keyboard hid_hyperv ghash_clmulni_intel sha512_ssse3
hv_vmbus sha256_ssse3 sha1_ssse3
[90850.013725] CPU: 4 PID: 6892 Comm: umount Not tainted 6.7.0 #4
[90850.013727] Hardware name: Microsoft Corporation Virtual
Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 04/06/2022
[90850.013728] RIP: 0010:kernfs_remove_by_name_ns+0xba/0xc0
[90850.013731] Code: bc 00 48 89 ef e8 26 a4 c5 ff 5b b8 fe ff ff ff
5d 41 5c 41 5d e9 b1 7c bc 00 0f 0b eb a6 48 c7 c7 20 cf 8e ac e8 66
3e bd ff <0f> 0b eb dc 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
90 90
[90850.013733] RSP: 0018:ffffbd6c4cbb7de0 EFLAGS: 00010286
[90850.013734] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
[90850.013736] RDX: 0000000000000002 RSI: 0000000000000027 RDI: 00000000ffffffff
[90850.013737] RBP: ffff9b2d65fc0000 R08: 0000000000000000 R09: ffffbd6c4cbb7c68
[90850.013738] R10: 0000000000000003 R11: ffffffffad3443e8 R12: ffffffffc0c910fb
[90850.013739] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[90850.013740] FS: 00007fe8fbdb6800(0000) GS:ffff9b3427b00000(0000)
knlGS:0000000000000000
[90850.013742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[90850.013743] CR2: 00007ffd7b335f98 CR3: 00000000d6512004 CR4: 0000000000370ef0
[90850.013746] Call Trace:
[90850.013748] <TASK>
[90850.013749] ? kernfs_remove_by_name_ns+0xba/0xc0
[90850.013751] ? __warn+0x7d/0x130
[90850.013757] ? kernfs_remove_by_name_ns+0xba/0xc0
[90850.013759] ? report_bug+0x18d/0x1c0
[90850.013763] ? srso_alias_return_thunk+0x5/0xfbef5
[90850.013765] ? console_unlock+0x74/0x120
[90850.013769] ? handle_bug+0x3c/0x80
[90850.013772] ? exc_invalid_op+0x13/0x60
[90850.013774] ? asm_exc_invalid_op+0x16/0x20
[90850.013780] ? kernfs_remove_by_name_ns+0xba/0xc0
[90850.013783] __bch2_fs_stop+0xc6/0x280 [bcachefs]
[90850.013819] generic_shutdown_super+0x7c/0x110
[90850.013824] bch2_kill_sb+0x12/0x20 [bcachefs]
[90850.013857] deactivate_locked_super+0x2f/0xb0
[90850.013860] cleanup_mnt+0xba/0x150
[90850.013863] task_work_run+0x59/0x90
[90850.013867] exit_to_user_mode_prepare+0x1e3/0x1f0
[90850.013871] syscall_exit_to_user_mode+0x17/0x40
[90850.013874] do_syscall_64+0x6c/0xe0
[90850.013876] ? srso_alias_return_thunk+0x5/0xfbef5
[90850.013878] ? syscall_exit_to_user_mode+0x27/0x40
[90850.013880] ? srso_alias_return_thunk+0x5/0xfbef5
[90850.013882] ? do_syscall_64+0x6c/0xe0
[90850.013883] ? srso_alias_return_thunk+0x5/0xfbef5
[90850.013885] ? exc_page_fault+0x7b/0x180
[90850.013887] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[90850.013890] RIP: 0033:0x7fe8fbfd652b
[90850.013899] Code: c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3
0f 1e fa 31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00
00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 d1 18 0c 00
f7 d8
[90850.013900] RSP: 002b:00007ffd7b337748 EFLAGS: 00000246 ORIG_RAX:
00000000000000a6
[90850.013902] RAX: 0000000000000000 RBX: 000055d8e3eab690 RCX: 00007fe8fbfd652b
[90850.013903] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055d8e3eb0010
[90850.013904] RBP: 00007ffd7b337820 R08: 000055d8e3ea6010 R09: 0000000000000007
[90850.013905] R10: 0000000000000000 R11: 0000000000000246 R12: 000055d8e3eab790
[90850.013906] R13: 0000000000000000 R14: 000055d8e3eb0010 R15: 000055d8e3eaffd0
[90850.013910] </TASK>
[90850.013911] ---[ end trace 0000000000000000 ]---

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-Tony