[v6.6] WARNING in ocfs2_unlink

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: e5bbb12db2c7 Linux 6.6.115
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=111dfe7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=89e14cd1d0729829ef10
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e6860876f0ec/disk-e5bbb12d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d6c28d7cc7f3/vmlinux-e5bbb12d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f52ba3964b2/bzImage-e5bbb12d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+89e14c...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 17559 at fs/inode.c:332 drop_nlink+0xbf/0x100 fs/inode.c:332
Modules linked in:
CPU: 1 PID: 17559 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:drop_nlink+0xbf/0x100 fs/inode.c:332
Code: 48 8b 1b 48 8d bb 78 07 00 00 be 08 00 00 00 e8 57 58 ea ff f0 48 ff 83 78 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 81 fc 92 ff <0f> 0b eb 88 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c
RSP: 0018:ffffc900032a7990 EFLAGS: 00010293
RAX: ffffffff81f2930f RBX: ffff888071e68878 RCX: ffff88802cbc1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff90da85a7 R09: 1ffffffff21b50b4
R10: dffffc0000000000 R11: fffffbfff21b50b5 R12: 1ffff1100e3cd11a
R13: 1ffff92000654f48 R14: ffff888071e688d0 R15: dffffc0000000000
FS: 000055557a428500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae08a99286 CR3: 0000000062fe4000 CR4: 00000000003506e0
Call Trace:
<TASK>
ocfs2_unlink+0x1131/0x18f0 fs/ocfs2/namei.c:1004
vfs_rmdir+0x370/0x4d0 fs/namei.c:4204
do_rmdir+0x29e/0x5c0 fs/namei.c:4263
__do_sys_unlinkat fs/namei.c:4441 [inline]
__se_sys_unlinkat fs/namei.c:4435 [inline]
__x64_sys_unlinkat+0xc4/0xe0 fs/namei.c:4435
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe79db8e5a7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdc2ace008 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fe79db8e5a7
RDX: 0000000000000200 RSI: 00007ffdc2acf1b0 RDI: 00000000ffffff9c
RBP: 00007fe79dc11d7d R08: 000055557a44b66b R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffdc2acf1b0
R13: 00007fe79dc11d7d R14: 000000000016849c R15: 00007ffdc2ad1370
</TASK>


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: e5bbb12db2c7 Linux 6.6.115
git tree: linux-6.6.y

console output: https://syzkaller.appspot.com/x/log.txt?x=12d9a342580000

kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=89e14cd1d0729829ef10
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16bcbf34580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1531c292580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e6860876f0ec/disk-e5bbb12d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d6c28d7cc7f3/vmlinux-e5bbb12d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8f52ba3964b2/bzImage-e5bbb12d.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/68b9d3346d0a/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=144f6e14580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+89e14c...@syzkaller.appspotmail.com

------------[ cut here ]------------

WARNING: CPU: 0 PID: 5908 at fs/inode.c:332 drop_nlink+0xbf/0x100 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 5908 Comm: syz-executor Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:drop_nlink+0xbf/0x100 fs/inode.c:332
Code: 48 8b 1b 48 8d bb 78 07 00 00 be 08 00 00 00 e8 57 58 ea ff f0 48 ff 83 78 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 81 fc 92 ff <0f> 0b eb 88 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c

RSP: 0018:ffffc900033a7990 EFLAGS: 00010293
RAX: ffffffff81f2930f RBX: ffff88805e100878 RCX: ffff888022fd3c00

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff90da85a7 R09: 1ffffffff21b50b4

R10: dffffc0000000000 R11: fffffbfff21b50b5 R12: 1ffff1100bc2011a
R13: 1ffff92000674f48 R14: ffff88805e1008d0 R15: dffffc0000000000
FS: 0000555576204500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000055557622f648 CR3: 000000002ca13000 CR4: 00000000003506f0

Call Trace:
<TASK>
ocfs2_unlink+0x1131/0x18f0 fs/ocfs2/namei.c:1004
vfs_rmdir+0x370/0x4d0 fs/namei.c:4204
do_rmdir+0x29e/0x5c0 fs/namei.c:4263
__do_sys_unlinkat fs/namei.c:4441 [inline]
__se_sys_unlinkat fs/namei.c:4435 [inline]
__x64_sys_unlinkat+0xc4/0xe0 fs/namei.c:4435
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

RIP: 0033:0x7f10f878e5a7

Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007fff2dc72d78 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f10f878e5a7
RDX: 0000000000000200 RSI: 00007fff2dc73f20 RDI: 00000000ffffff9c
RBP: 00007f10f8811d7d R08: 000055557622766b R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000207 R12: 00007fff2dc73f20
R13: 00007f10f8811d7d R14: 00000000000186e8 R15: 00007fff2dc760e0
</TASK>


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