linux-kernel - [syzbot] [fs?] WARNING in minix

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Message-ID: <685ada22.a00a0220.2e5631.0089.GAE@google.com>
Date: Tue, 24 Jun 2025 10:02:26 -0700
From: syzbot <syzbot+a65e824272c5f741247d@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [fs?] WARNING in minix_rename

Hello,

syzbot found the following issue on:

HEAD commit:    78f4e737a53e Merge tag 'for-6.16/dm-fixes' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b29182580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=28cc6f051378bb16
dashboard link: https://syzkaller.appspot.com/bug?extid=a65e824272c5f741247d
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1446370c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/560a423a60ad/disk-78f4e737.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e97e18d85b9/vmlinux-78f4e737.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a147a5a27c6e/bzImage-78f4e737.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/2c4c332ed1d0/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=12276b70580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a65e824272c5f741247d@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6388 at fs/inode.c:417 drop_nlink+0xc5/0x110 fs/inode.c:417
Modules linked in:
CPU: 0 UID: 0 PID: 6388 Comm: syz.6.27 Not tainted 6.16.0-rc3-syzkaller-00042-g78f4e737a53e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:417
Code: 78 07 00 00 be 08 00 00 00 e8 c7 35 e8 ff f0 48 ff 83 78 07 00 00 5b 41 5c 41 5e 41 5f 5d e9 42 01 29 09 cc e8 fc da 86 ff 90 <0f> 0b 90 eb 81 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 5b ff ff ff
RSP: 0018:ffffc900030c7a30 EFLAGS: 00010293
RAX: ffffffff82397124 RBX: ffff888055405aa8 RCX: ffff88802da29e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f9fe1f7 R09: 1ffffffff1f3fc3e
R10: dffffc0000000000 R11: fffffbfff1f3fc3f R12: 1ffff1100aa80b5e
R13: 0000000000000000 R14: ffff888055405af0 R15: dffffc0000000000
FS:  00007fb57180a6c0(0000) GS:ffff888125c83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb571809f98 CR3: 0000000032278000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2634 [inline]
 minix_rename+0x3cf/0x700 fs/minix/namei.c:222
 vfs_rename+0xb99/0xec0 fs/namei.c:5137
 do_renameat2+0x878/0xc50 fs/namei.c:5286
 __do_sys_rename fs/namei.c:5333 [inline]
 __se_sys_rename fs/namei.c:5331 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5331
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb57098e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb57180a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fb570bb6080 RCX: 00007fb57098e929
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000200000001980
RBP: 00007fb570a10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fb570bb6080 R15: 00007fffa5abc5a8
 </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 syzkaller@...glegroups.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 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.

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