[syzbot] [fs?] WARNING in minix_rmdir (2)

[syzbot] [fs?] WARNING in minix_rmdir (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    b88c841d1164 Merge tag 'input-for-v7.3-rc6' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14db50a5580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d1b274ca9837366
dashboard link: https://syzkaller.appspot.com/bug?extid=8420e667af06b1709c00
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ba149c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=114291d1580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b88c841d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c64cd81f2bae/vmlinux-b88c841d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/605b0408da7b/bzImage-b88c841d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/3ed2a0024dcf/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8420e667af06b1709c00@syzkaller.appspotmail.com

------------[ cut here ]------------
inode->i_nlink == 0
WARNING: fs/inode.c:408 at drop_nlink+0xc5/0x110 fs/inode.c:408, CPU#0: syz-executor/5454
Modules linked in:
CPU: 0 UID: 0 PID: 5454 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:drop_nlink+0xc5/0x110 fs/inode.c:408
Code: a8 07 00 00 be 08 00 00 00 e8 f7 68 e4 ff f0 48 ff 83 a8 07 00 00 5b 41 5c 41 5e 41 5f 5d e9 52 90 97 09 cc e8 0c e7 71 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:ffffc900033b7d10 EFLAGS: 00010293
RAX: ffffffff82563a14 RBX: ffff8880439c30b0 RCX: ffff888013d0cb00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff917a977f R09: 1ffffffff22f52ef
R10: dffffc0000000000 R11: fffffbfff22f52f0 R12: 1ffff1100873861f
R13: dffffc0000000000 R14: ffff8880439c30f8 R15: dffffc0000000000
FS:  000055555e111500(0000) GS:ffff88808b0b4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556e57c72048 CR3: 0000000013446000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_dec_link_count include/linux/fs.h:2269 [inline]
 minix_rmdir+0xfc/0x140 fs/minix/namei.c:183
 vfs_rmdir+0x3e6/0x6a0 fs/namei.c:5544
 filename_rmdir+0x292/0x520 fs/namei.c:5601
 __do_sys_unlinkat fs/namei.c:5776 [inline]
 __se_sys_unlinkat+0x71/0x1a0 fs/namei.c:5769
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f819279d2f7
Code: 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef5481018 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f819279d2f7
RDX: 0000000000000200 RSI: 00007ffef54821c0 RDI: 00000000ffffff9c
RBP: 00007f8192834ccb R08: 0000000000018560 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000207 R12: 00007ffef54821c0
R13: 00007f8192834ccb R14: 0000000000028576 R15: 00007ffef5484380
 </TASK>


---
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