syzbot

F2FS-fs (loop6): invalid namelen(0), ino:8, run fsck to fix.
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WARNING: CPU: 0 PID: 4241 at fs/inode.c:332 drop_nlink+0xe8/0x148 fs/inode.c:332
Modules linked in:
CPU: 0 PID: 4241 Comm: syz-executor Not tainted 5.15.185-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : drop_nlink+0xe8/0x148 fs/inode.c:332
lr : drop_nlink+0xe8/0x148 fs/inode.c:332
sp : ffff80001f8879b0
x29: ffff80001f8879b0 x28: ffff0000e9441c80 x27: dfff800000000000
x26: 1fffff80006949a9 x25: dfff800000000000 x24: 1fffe0001d288390
x23: 1fffe0001d288399 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000e9441cc8 x19: ffff0000e9441c80 x18: 0000000000000000
x17: ffff800016cf0000 x16: ffff8000082bf3c8 x15: ffff8000167d04c0
x14: ffff0000cc854080 x13: ffff0000cc854148 x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80000894edfc
x8 : ffff0000cc853680 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000020 x4 : 0000000000000000 x3 : ffff800008044e7c
x2 : 0000000000000006 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 drop_nlink+0xe8/0x148 fs/inode.c:332
 f2fs_i_links_write fs/f2fs/f2fs.h:2884 [inline]
 f2fs_drop_nlink+0x108/0x300 fs/f2fs/dir.c:911
 f2fs_delete_entry+0x9dc/0xd5c fs/f2fs/dir.c:978
 f2fs_unlink+0x2a0/0x84c fs/f2fs/namei.c:567
 f2fs_rmdir+0x5c/0x7c fs/f2fs/namei.c:733
 vfs_rmdir+0x1c4/0x3ec fs/namei.c:4149
 do_rmdir+0x240/0x634 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 289292
hardirqs last  enabled at (289291): [<ffff800008387eb8>] seqcount_lockdep_reader_access+0x1fc/0x2c4 include/linux/seqlock.h:105
hardirqs last disabled at (289292): [<ffff8000111a5098>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (289050): [<ffff800008031d3c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (289048): [<ffff800008031d08>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
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