VFS: Found a V7 FS (block size = 512) on device loop1
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WARNING: CPU: 1 PID: 10176 at fs/inode.c:361 inc_nlink+0x126/0x150 fs/inode.c:365
Modules linked in:
CPU: 1 PID: 10176 Comm: syz-executor.1 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:inc_nlink+0x126/0x150 fs/inode.c:361
Code: ef 89 44 24 04 e8 ba 89 f0 ff 8b 44 24 04 e9 4d ff ff ff 48 89 ef e8 39 89 f0 ff e9 14 ff ff ff 48 89 ef e8 2c 89 f0 ff eb cc <0f> 0b e9 6a ff ff ff e8 2e 89 f0 ff e9 53 ff ff ff e8 24 89 f0 ff
RSP: 0018:ffffc9000a8f7df0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88803da989d8 RCX: 00000000000000a8
RDX: 1ffff11007b53156 RSI: ffff88803da989d8 RDI: ffff88803da98ab0
RBP: ffff88803da98a20 R08: ffff88803da989f8 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88803da989d8
R13: ffff88803d6ff1b8 R14: 0000000000000000 R15: ffff88803da989d8
FS:  00007f1f782f3700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9ee9f6010 CR3: 00000000173d8000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 inode_inc_link_count include/linux/fs.h:2433 [inline]
 sysv_mkdir+0x17/0xf0 fs/sysv/namei.c:119
 vfs_mkdir+0x43d/0x6a0 fs/namei.c:3823
 do_mkdirat+0x20c/0x280 fs/namei.c:3848
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1f782f3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 00000000000000b8 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffe5abb33ef R14: 00007f1f782f3300 R15: 0000000000022000
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Code disassembly (best guess):
   0:	ef                   	out    %eax,(%dx)
   1:	89 44 24 04          	mov    %eax,0x4(%rsp)
   5:	e8 ba 89 f0 ff       	callq  0xfff089c4
   a:	8b 44 24 04          	mov    0x4(%rsp),%eax
   e:	e9 4d ff ff ff       	jmpq   0xffffff60
  13:	48 89 ef             	mov    %rbp,%rdi
  16:	e8 39 89 f0 ff       	callq  0xfff08954
  1b:	e9 14 ff ff ff       	jmpq   0xffffff34
  20:	48 89 ef             	mov    %rbp,%rdi
  23:	e8 2c 89 f0 ff       	callq  0xfff08954
  28:	eb cc                	jmp    0xfffffff6
  2a:	0f 0b                	ud2     <-- trapping instruction
  2c:	e9 6a ff ff ff       	jmpq   0xffffff9b
  31:	e8 2e 89 f0 ff       	callq  0xfff08964
  36:	e9 53 ff ff ff       	jmpq   0xffffff8e
  3b:	e8 24 89 f0 ff       	callq  0xfff08964