[v5.15] WARNING in minix_unlink

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3a5928702e71 Linux 5.15.167
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13b95900580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4d3fd5cca89ae935
dashboard link: https://syzkaller.appspot.com/bug?extid=956eb664a75fe7aaf417
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ef5025f3d708/disk-3a592870.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/776fbdad3aa8/vmlinux-3a592870.xz
kernel image: https://storage.googleapis.com/syzbot-assets/79541db5bd16/bzImage-3a592870.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+956eb6...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3575 at fs/inode.c:307 drop_nlink+0xbb/0x100
Modules linked in:
CPU: 0 PID: 3575 Comm: syz-executor Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Code: 49 8b 1e 48 8d bb c8 07 00 00 be 08 00 00 00 e8 3b a4 ed ff f0 48 ff 83 c8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 65 d8 a3 ff <0f> 0b eb 89 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c
RSP: 0018:ffffc90002dc7c50 EFLAGS: 00010293
RAX: ffffffff81dc820b RBX: 1ffff1100e8ff965 RCX: ffff88801df08000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81dc818f R09: ffffed100e8ff96d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880747fcb28
R13: ffff8880744a11a0 R14: ffff8880747fcae0 R15: dffffc0000000000
FS: 000055557beeb500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18e8182870 CR3: 0000000065d69000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
inode_dec_link_count include/linux/fs.h:2503 [inline]
minix_unlink+0x14a/0x1a0 fs/minix/namei.c:167
vfs_unlink+0x359/0x5f0 fs/namei.c:4280
do_unlinkat+0x4a3/0x950 fs/namei.c:4348
__do_sys_unlink fs/namei.c:4396 [inline]
__se_sys_unlink fs/namei.c:4394 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4394
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f1e119674a7
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 57 00 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:00007ffd8c37d028 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1e119674a7
RDX: 00007ffd8c37d050 RSI: 00007ffd8c37d0e0 RDI: 00007ffd8c37d0e0
RBP: 00007ffd8c37d0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd8c37e1d0
R13: 00007f1e119daa14 R14: 00000000000171ad R15: 00007ffd8c37f290
</TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 0a51d2d4527b Linux 5.15.173
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17c0d75f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f63d146f1af4415a

dashboard link: https://syzkaller.appspot.com/bug?extid=956eb664a75fe7aaf417
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1020d75f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13310778580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/733a95526889/disk-0a51d2d4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/409603e5dc40/vmlinux-0a51d2d4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2d60efa369ee/bzImage-0a51d2d4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/41757e20704c/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+956eb6...@syzkaller.appspotmail.com

Trying to free block not in datazone
minix_free_inode: bit 5 already cleared
Trying to free block not in datazone
Trying to free block not in datazone
Trying to free block not in datazone
minix_free_inode: bit 6 already cleared
Trying to free block not in datazone
minix_free_inode: bit 7 already cleared
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4161 at fs/inode.c:307 drop_nlink+0xbb/0x100
Modules linked in:
CPU: 1 PID: 4161 Comm: syz-executor254 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:drop_nlink+0xbb/0x100 fs/inode.c:307
Code: 49 8b 1e 48 8d bb c8 07 00 00 be 08 00 00 00 e8 bb a3 ed ff f0 48 ff 83 c8 07 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 c5 c9 a3 ff <0f> 0b eb 89 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 62 ff ff ff 4c
RSP: 0018:ffffc90002f17c50 EFLAGS: 00010293
RAX: ffffffff81dca9db RBX: 1ffff1100eb1a2b9 RCX: ffff888027205940

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000000 R08: ffffffff81dca95f R09: ffffed100eb1a2c1
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880758d15c8
R13: ffff8880772b2758 R14: ffff8880758d1580 R15: dffffc0000000000
FS: 000055558d02d380(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000

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

CR2: 000055558d046778 CR3: 000000002a752000 CR4: 00000000003506e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

inode_dec_link_count include/linux/fs.h:2505 [inline]

minix_unlink+0x14a/0x1a0 fs/minix/namei.c:167
vfs_unlink+0x359/0x5f0 fs/namei.c:4280
do_unlinkat+0x4a3/0x950 fs/namei.c:4348
__do_sys_unlink fs/namei.c:4396 [inline]
__se_sys_unlink fs/namei.c:4394 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4394
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0

RIP: 0033:0x7fb428ef1d17
Code: 73 01 c3 48 c7 c1 b8 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 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd08835fa8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb428ef1d17
RDX: 00007ffd08835fd0 RSI: 00007ffd08836060 RDI: 00007ffd08836060
RBP: 00007ffd08836060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd08837150
R13: 000055558d03e740 R14: 431bde82d7b634db R15: 00007ffd088392d0
</TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.