Re: [syzbot] [fs?] WARNING in minix_rename

[syzbot <syzbot+a65e824272c5f741247d@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in minix_rename

------------[ cut here ]------------
WARNING: CPU: 1 PID: 6502 at fs/inode.c:417 drop_nlink+0xc5/0x110 fs/inode.c:417
Modules linked in:
CPU: 1 UID: 0 PID: 6502 Comm: syz.1.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:417
Code: 70 07 00 00 be 08 00 00 00 e8 57 df e7 ff f0 48 ff 83 70 07 00 00 5b 41 5c 41 5e 41 5f 5d e9 92 ba f1 08 cc e8 9c d7 82 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:ffffc90003cefa30 EFLAGS: 00010293
RAX: ffffffff823cc9d4 RBX: ffff8880560b0fe8 RCX: ffff888058c0dac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f5a6577 R09: 1ffffffff1eb4cae
R10: dffffc0000000000 R11: fffffbfff1eb4caf R12: 1ffff1100ac16206
R13: 0000000000000000 R14: ffff8880560b1030 R15: dffffc0000000000
FS:  00007fc01f0c26c0(0000) GS:ffff8881264ca000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc01f0c1f98 CR3: 0000000032b16000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2655 [inline]
 minix_rename+0x3cf/0x700 fs/minix/namei.c:228
 vfs_rename+0xb34/0xe80 fs/namei.c:5216
 do_renameat2+0x6a2/0xa50 fs/namei.c:5364
 __do_sys_rename fs/namei.c:5411 [inline]
 __se_sys_rename fs/namei.c:5409 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc01e18e929
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:00007fc01f0c2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fc01e3b6080 RCX: 00007fc01e18e929
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000200000001980
RBP: 00007fc01e210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc01e3b6080 R15: 00007ffc5451e3e8
 </TASK>


Tested on:

commit:         3a866087 Linux 6.18-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17642c58580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4dacb8e711c7e98e
dashboard link: https://syzkaller.appspot.com/bug?extid=a65e824272c5f741247d
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=126705e2580000