syzbot

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WARNING: CPU: 1 PID: 5949 at fs/inode.c:389 inc_nlink+0x121/0x130 fs/inode.c:389
Modules linked in:
CPU: 1 PID: 5949 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:inc_nlink+0x121/0x130 fs/inode.c:389
Code: 58 ea ff e9 3a ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c ff ff ff 48 89 df e8 f9 57 ea ff e9 3f ff ff ff e8 ef 0c 93 ff <0f> 0b eb 82 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 57 41
RSP: 0018:ffffc90003227c28 EFLAGS: 00010293
RAX: ffffffff81f28ab1 RBX: ffff888074b78058 RCX: ffff8880204a1e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88806094809b R09: 1ffff1100c129013
R10: dffffc0000000000 R11: ffffed100c129014 R12: dffffc0000000000
R13: 1ffff1100e96f00b R14: ffff888074b78000 R15: 0000000000000000
FS:  000055559176a500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559176a808 CR3: 000000001ef69000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 v9fs_vfs_mkdir_dotl+0x624/0x780 fs/9p/vfs_inode_dotl.c:431
 vfs_mkdir+0x296/0x440 fs/namei.c:4113
 do_mkdirat+0x1d4/0x440 fs/namei.c:4136
 __do_sys_mkdirat fs/namei.c:4151 [inline]
 __se_sys_mkdirat fs/namei.c:4149 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4149
 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: 0033:0x7fb31538eec9
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:00007ffc17101998 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fb3155e5fa0 RCX: 00007fb31538eec9
RDX: 0000000000000003 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fb315411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3155e5fa0 R14: 00007fb3155e5fa0 R15: 0000000000000003
 </TASK>