loop0: detected capacity change from 0 to 4
VFS: Found a V7 FS (block size = 512) on device loop0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8445 at fs/inode.c:361 inc_nlink+0x144/0x160 fs/inode.c:361
Modules linked in:
CPU: 1 PID: 8445 Comm: syz-executor957 Not tainted 5.12.0-next-20210507-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:inc_nlink+0x144/0x160 fs/inode.c:361
Code: ff 4c 89 e7 e8 bd b8 ed ff e9 42 ff ff ff 4c 89 e7 e8 40 b8 ed ff e9 fc fe ff ff 4c 89 e7 e8 33 b8 ed ff eb d4 e8 5c ca a8 ff <0f> 0b e9 6e ff ff ff e8 30 b8 ed ff e9 44 ff ff ff e8 26 b8 ed ff
RSP: 0018:ffffc900018cfdf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888038374038 RCX: 0000000000000000
RDX: ffff888022bc1c80 RSI: ffffffff81cc0bd4 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81cc0b40 R11: 0000000000000000 R12: ffff888038374080
R13: ffff8880345cfa70 R14: ffffffff8995bc00 R15: 0000000000000021
FS:  00000000005a7300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005614035bd840 CR3: 000000002128a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 inode_inc_link_count include/linux/fs.h:2434 [inline]
 sysv_mkdir+0x21/0x150 fs/sysv/namei.c:119
 vfs_mkdir+0x538/0x770 fs/namei.c:3813
 do_mkdirat+0x284/0x310 fs/namei.c:3838
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x443c29
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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee26afc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000443c29
RDX: 00000000004021f3 RSI: 0000000000000023 RDI: 0000000020000080
RBP: 00000000004034c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffee26afb30 R11: 0000000000000246 R12: 0000000000403550
R13: 0000000000000000 R14: 00000000004b1018 R15: 00000000004004a0