F2FS-fs (loop3): Can't find valid F2FS filesystem in 2th superblock
F2FS-fs (loop3): Found nat_bits in checkpoint
F2FS-fs (loop3): Try to recover 2th superblock, ret: 0
F2FS-fs (loop3): Mounted with checkpoint version = 753bd00b
================================================
WARNING: lock held when returning to user space!
4.14.302-syzkaller #0 Not tainted
------------------------------------------------
syz-executor.3/9830 is leaving the kernel with locks still held!
1 lock held by syz-executor.3/9830:
 #0:  (sb_writers#15){.+.+}, at: [<ffffffff818e216d>] sb_start_write include/linux/fs.h:1551 [inline]
 #0:  (sb_writers#15){.+.+}, at: [<ffffffff818e216d>] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8020 at fs/namespace.c:1178 cleanup_mnt+0x222/0x2c0 fs/namespace.c:1178
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.2'.
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8020 Comm: syz-executor.3 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 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
9pnet_virtio: no channels available for device 127.0.0.1
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:cleanup_mnt+0x222/0x2c0 fs/namespace.c:1178
RSP: 0018:ffff8880a7d67e18 EFLAGS: 00010297
RAX: ffff88809332a3c0 RBX: dffffc0000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8a0939e0
RBP: 0000000000000008 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88809332a3c0 R12: ffff888098fad000
R13: 0000000000000001 R14: 0000000000000007 R15: fffffbfff1412776
 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: 0033:0x7f400a75b537
RSP: 002b:00007ffdf3684e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f400a75b537
RDX: 00007ffdf3684f28 RSI: 000000000000000a RDI: 00007ffdf3684f20
RBP: 00007ffdf3684f20 R08: 00000000ffffffff R09: 00007ffdf3684cf0
R10: 0000555555d16903 R11: 0000000000000246 R12: 00007f400a7b4b24
R13: 00007ffdf3685fe0 R14: 0000555555d16810 R15: 00007ffdf3686020
Kernel Offset: disabled
Rebooting in 86400 seconds..