overlayfs: option "workdir=./file0" is useless in a non-upper mount, ignore
overlayfs: at least 2 lowerdir are needed while upperdir nonexistent
attempt to access beyond end of device
loop4: rw=0, want=6491538, limit=128
Buffer I/O error on dev loop4, logical block 3245768, async page read
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4549 at fs/inode.c:389 inc_nlink+0x11d/0x130 fs/inode.c:389
Modules linked in:
CPU: 0 PID: 4549 Comm: syz.4.35 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:inc_nlink+0x11d/0x130 fs/inode.c:389
Code: 0c ef 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 ad 0c ef ff e9 3f ff ff ff e8 a3 a4 aa ff <0f> 0b eb 82 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41
RSP: 0018:ffffc90002e1fd60 EFLAGS: 00010287
RAX: ffffffff81cd267d RBX: ffff88805b05c080 RCX: 0000000000080000
RDX: ffffc9000cb99000 RSI: 000000000000b8f5 RDI: 000000000000b8f6
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1002d39a57
R10: ffffed1002d39a57 R11: 1ffff11002d39a56 R12: dffffc0000000000
R13: 1ffff1100b60b810 R14: ffff88805b05c038 R15: 0000000000000000
FS:  00007f1782d816c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002780 CR3: 000000004fc87000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_inc_link_count include/linux/fs.h:2497 [inline]
 sysv_mkdir+0x1d/0x120 fs/sysv/namei.c:119
 vfs_mkdir+0x387/0x570 fs/namei.c:4065
 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4090
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80