F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Mounted with checkpoint version = 753bd00b
================================================
WARNING: lock held when returning to user space!
4.14.307-syzkaller #0 Not tainted
------------------------------------------------
syz-executor.0/9525 is leaving the kernel with locks still held!
1 lock held by syz-executor.0/9525:
 #0:  (sb_writers#13){.+.+}, at: [<ffffffff818e21ad>] sb_start_write include/linux/fs.h:1551 [inline]
 #0:  (sb_writers#13){.+.+}, at: [<ffffffff818e21ad>] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8011 at fs/namespace.c:1178 cleanup_mnt+0x222/0x2c0 fs/namespace.c:1178
Kernel panic - not syncing: kernel: panic_on_warn set ...

CPU: 0 PID: 8011 Comm: syz-executor.0 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x21d/0x451 kernel/panic.c:247
 check_panic_on_warn.cold+0x19/0x35 kernel/panic.c:171
 __warn+0xdf/0x1e0 kernel/panic.c:603
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:cleanup_mnt+0x222/0x2c0 fs/namespace.c:1178
RSP: 0018:ffff8880aac47e18 EFLAGS: 00010297
RAX: ffff888093bde280 RBX: dffffc0000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8a094768
RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888093bde280 R12: ffff8880906eee00
R13: 0000000000000001 R14: 0000000000000007 R15: fffffbfff1412926
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f5c5aa3e567
RSP: 002b:00007ffebfab8be8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5c5aa3e567
RDX: 00007ffebfab8cb9 RSI: 000000000000000a RDI: 00007ffebfab8cb0
RBP: 00007ffebfab8cb0 R08: 00000000ffffffff R09: 00007ffebfab8a80
R10: 0000555556423903 R11: 0000000000000246 R12: 00007f5c5aa97b24
R13: 00007ffebfab9d70 R14: 0000555556423810 R15: 00007ffebfab9db0
Kernel Offset: disabled
Rebooting in 86400 seconds..