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* [syzbot] [bcachefs?] kernel BUG in __journal_res_get
@ 2024-05-09  8:04 syzbot
  2024-05-10  5:08 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2024-05-09  8:04 UTC (permalink / raw)
  To: bfoster, kent.overstreet, linux-bcachefs, linux-kernel, syzkaller-bugs


syzbot found the following issue on:

HEAD commit:    1c9135d29e9e Merge branch 'for-next/core' into for-kernelci
git tree:       git:// for-kernelci
console output:
kernel config:
dashboard link:
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:
C reproducer:

Downloadable assets:
disk image:
kernel image:
mounted in repro #1:
mounted in repro #2:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

  bp_start          7, fixing
bcachefs (loop0): alloc_read... done
bcachefs (loop0): stripes_read... done
bcachefs (loop0): snapshots_read... done
------------[ cut here ]------------
kernel BUG at fs/bcachefs/journal.c:370!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6237 Comm: syz-executor338 Not tainted 6.9.0-rc7-syzkaller-g1c9135d29e9e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : journal_entry_open fs/bcachefs/journal.c:370 [inline]
pc : __journal_res_get+0x1d64/0x1f6c fs/bcachefs/journal.c:555
lr : journal_entry_open fs/bcachefs/journal.c:370 [inline]
lr : __journal_res_get+0x1d64/0x1f6c fs/bcachefs/journal.c:555
sp : ffff80009c676980
x29: ffff80009c676be0 x28: ffff80009c676b20 x27: 00000000003ffffe
x26: ffff0000dcdca7c0 x25: ffff0000dcd80870 x24: ffff0000dcdca7b8
x23: dfff800000000000 x22: 1fffe0001b9b94d5 x21: 0111110080100107
x20: 1fffe0001b9b9430 x19: ffff0000dcdca180 x18: ffff80009c676880
x17: 000000000000caa6 x16: ffff800080331e9c x15: 0000000000000001
x14: 1fffe0001b9b94f7 x13: 0000000000000000 x12: 0000000000000000
x11: ffff60001b9b94f8 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000d0f6bc80 x7 : ffff8000828e150c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000828e163c
x2 : 0000000000000000 x1 : 0000000000000002 x0 : 0000000000000000
Call trace:
 journal_entry_open fs/bcachefs/journal.c:370 [inline]
 __journal_res_get+0x1d64/0x1f6c fs/bcachefs/journal.c:555
 bch2_journal_res_get_slowpath+0x9c/0x2a4 fs/bcachefs/journal.c:617
 bch2_journal_res_get+0x124/0x1b4 fs/bcachefs/journal.h:382
 bch2_journal_meta+0x9c/0x268 fs/bcachefs/journal.c:832
 bch2_fs_recovery+0x2f4c/0x4854 fs/bcachefs/recovery.c:798
 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1043
 bch2_fs_open+0x8b4/0xb64 fs/bcachefs/super.c:2102
 bch2_mount+0x558/0xe10 fs/bcachefs/fs.c:1903
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662
 vfs_get_tree+0x90/0x288 fs/super.c:1779
 do_new_mount+0x278/0x900 fs/namespace.c:3352
 path_mount+0x590/0xe04 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3875
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: 17ffff9c 9771bacd d4210000 9771bacb (d4210000) 
---[ end trace 0000000000000000 ]---

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [syzbot] [bcachefs?] kernel BUG in __journal_res_get
  2024-05-09  8:04 [syzbot] [bcachefs?] kernel BUG in __journal_res_get syzbot
@ 2024-05-10  5:08 ` syzbot
  0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2024-05-10  5:08 UTC (permalink / raw)
  To: bfoster, kent.overstreet, linux-bcachefs, linux-kernel, syzkaller-bugs

syzbot has bisected this issue to:

commit 2d02bfb01b2743da06748ba396ff7da4425488ef
Author: Kent Overstreet <>
Date:   Fri Jan 5 19:17:57 2024 +0000

    bcachefs: improve validate_bset_keys()

bisection log:
start commit:   45db3ab70092 Merge tag '6.9-rc7-ksmbd-fixes' of git://git...
git tree:       upstream
final oops:
console output:
kernel config:
dashboard link:
syz repro:
C reproducer:

Fixes: 2d02bfb01b27 ("bcachefs: improve validate_bset_keys()")

For information about bisection process see:

^ permalink raw reply	[flat|nested] 2+ messages in thread

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