VFS: Found a Xenix FS (block size = 1024) on device loop4
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5427 at fs/inode.c:389 inc_nlink+0x120/0x130
Modules linked in:
CPU: 0 PID: 5427 Comm: syz.4.232 Not tainted 6.1.127-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:inc_nlink+0x120/0x130 fs/inode.c:389
Code: e9 ff e9 37 ff ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 49 ff ff ff 4c 89 ef e8 9a eb e9 ff e9 3c ff ff ff e8 b0 58 92 ff <0f> 0b eb 80 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 57 41 56 53 48
RSP: 0018:ffffc9000590fd40 EFLAGS: 00010283
RAX: ffffffff81f843f0 RBX: 1ffff1100abd6010 RCX: 0000000000080000
RDX: ffffc9000dae2000 RSI: 00000000000089ad RDI: 00000000000089ae
RBP: 0000000000000000 R08: ffffffff81f8436a R09: ffffed1002fc2b57
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff888055eb0080 R14: ffff888055eb0038 R15: 0000000000000000
FS:  00007f7b0d2866c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d71fffc CR3: 00000000270fd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_inc_link_count include/linux/fs.h:2576 [inline]
 sysv_mkdir+0x1d/0x120 fs/sysv/namei.c:119
 vfs_mkdir+0x3b6/0x590 fs/namei.c:4106
 do_mkdirat+0x225/0x360 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4144
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7b0c38cd29
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:00007f7b0d286038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f7b0c5a5fa0 RCX: 00007f7b0c38cd29
RDX: 0000000000000018 RSI: 0000000020000140 RDI: ffffffffffffff9c
RBP: 00007f7b0c40e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7b0c5a5fa0 R15: 00007ffecc3269d8
 </TASK>