loop0: detected capacity change from 0 to 4
VFS: Found a V7 FS (block size = 512) on device loop0
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WARNING: CPU: 1 PID: 2506 at fs/inode.c:361 inc_nlink+0x144/0x160 fs/inode.c:361
Modules linked in:
CPU: 1 PID: 2506 Comm: syz-executor.0 Not tainted 5.13.0-rc6-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 1d c4 ed ff e9 42 ff ff ff 4c 89 e7 e8 a0 c3 ed ff e9 fc fe ff ff 4c 89 e7 e8 93 c3 ed ff eb d4 e8 4c ba a8 ff <0f> 0b e9 6e ff ff ff e8 90 c3 ed ff e9 44 ff ff ff e8 86 c3 ed ff
RSP: 0018:ffffc900175e7df0 EFLAGS: 00010212

RAX: 00000000000189e7 RBX: ffff888078a4c998 RCX: ffffc90002c11000
RDX: 0000000000040000 RSI: ffffffff81cc21a4 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81cc2110 R11: 0000000000000000 R12: ffff888078a4c9e0
R13: ffff88807d9e91a0 R14: ffffffff8995afc0 R15: 0000000000000000
FS:  00007fb817a31700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a53ad CR3: 00000000778f4000 CR4: 0000000000350ee0
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: 0033:0x4665d9
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:00007fb817a31188 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc24aceb8f R14: 00007fb817a31300 R15: 0000000000022000