------------[ cut here ]------------
WARNING: CPU: 0 PID: 4937 at fs/inode.c:389 inc_nlink+0x128/0x154 fs/inode.c:389
Modules linked in:
CPU: 0 PID: 4937 Comm: syz.2.130 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : inc_nlink+0x128/0x154 fs/inode.c:389
lr : inc_nlink+0x128/0x154 fs/inode.c:389
sp : ffff8000211d7870
x29: ffff8000211d7870
 x28: ffff0000e13db540
 x27: 0000000000000004

x26: fffffc0003499ec0
 x25: dfff800000000000
 x24: ffff8000211d7a80

x23: 1fffe0001c27b595
 x22: dfff800000000000
 x21: 0000000000000000

x20: ffff0000e13dac60
 x19: ffff0000e13daca8
 x18: 0000000000000000

x17: ffff8000181e7000 x16: ffff8000082e7bb0 x15: 0000000000000002
x14: 0000000000006000 x13: 0000000039387000 x12: 0000000000080000
x11: 000000000000a57e x10: ffff8000272a9000 x9 : ffff8000089fbef8
x8 : 000000000000a57f x7 : 0000000039387000 x6 : 000000000000002d
x5 : ffff0000e13dbd88 x4 : ffff0000e13dbd48 x3 : ffff80000a2863e0
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 inc_nlink+0x128/0x154 fs/inode.c:389
 f2fs_i_links_write fs/f2fs/f2fs.h:3048 [inline]
 f2fs_update_parent_metadata+0xa8/0x2a4 fs/f2fs/dir.c:666
 f2fs_add_inline_entry+0x488/0x628 fs/f2fs/inline.c:675
 f2fs_add_dentry fs/f2fs/dir.c:843 [inline]
 f2fs_do_add_link+0x250/0x4d4 fs/f2fs/dir.c:886
 f2fs_add_link fs/f2fs/f2fs.h:3538 [inline]
 f2fs_mkdir+0x28c/0x4d4 fs/f2fs/namei.c:711
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4106
 do_mkdirat+0x1b4/0x3e0 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 480518
hardirqs last  enabled at (480517): [<ffff800008926728>] folio_memcg_lock+0xe8/0x1fc mm/memcontrol.c:2113
hardirqs last disabled at (480518): [<ffff8000119455d8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (480414): [<ffff800008030900>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (480412): [<ffff8000080308cc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---
overlayfs: './file0' not a directory