[syzbot] [bcachefs?] kernel BUG in __journal_res_get

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 1c9135d29e9e Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=112d6eb8980000
kernel config: https://syzkaller.appspot.com/x/.config?x=7d2d53e64c7e6a4f
dashboard link: https://syzkaller.appspot.com/bug?extid=c60cd352aedb109528bf
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120c63bc980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1360afff180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/52dd1b4921ab/disk-1c9135d2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1a4f1788dc25/vmlinux-1c9135d2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b8d8ebd42a80/Image-1c9135d2.gz.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/4034fbab270b/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/fb9b707711cf/mount_1.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c60cd3...@syzkaller.appspotmail.com

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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[syzbot]

syzbot has bisected this issue to:

commit 2d02bfb01b2743da06748ba396ff7da4425488ef
Author: Kent Overstreet <kent.ov...@linux.dev>
Date: Fri Jan 5 19:17:57 2024 +0000

bcachefs: improve validate_bset_keys()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1232e998980000
start commit: 45db3ab70092 Merge tag '6.9-rc7-ksmbd-fixes' of git://git...
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=1132e998980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1632e998980000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d7ea7de0cb32587
dashboard link: https://syzkaller.appspot.com/bug?extid=c60cd352aedb109528bf
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15b795a8980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17592c00980000

Reported-by: syzbot+c60cd3...@syzkaller.appspotmail.com
Fixes: 2d02bfb01b27 ("bcachefs: improve validate_bset_keys()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection