[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.155' (ECDSA) to the list of known hosts.
syzkaller login: [   27.617926] print_req_error: I/O error, dev loop0, sector 0
[   27.643244] ------------[ cut here ]------------
[   27.648153] WARNING: CPU: 1 PID: 8094 at fs/inode.c:284 drop_nlink+0x7d/0xd0
[   27.655336] Kernel panic - not syncing: panic_on_warn set ...
[   27.655336] 
[   27.662698] CPU: 1 PID: 8094 Comm: syz-executor649 Not tainted 4.14.297-syzkaller #0
[   27.670560] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
[   27.679889] Call Trace:
[   27.682462]  dump_stack+0x1b2/0x281
[   27.686071]  panic+0x1f9/0x42d
[   27.689250]  ? add_taint.cold+0x16/0x16
[   27.693207]  ? drop_nlink+0x7d/0xd0
[   27.696816]  ? drop_nlink+0x7d/0xd0
[   27.700507]  __warn.cold+0x20/0x44
[   27.704026]  ? ist_end_non_atomic+0x10/0x10
[   27.708325]  ? drop_nlink+0x7d/0xd0
[   27.711929]  report_bug+0x208/0x250
[   27.715559]  do_error_trap+0x195/0x2d0
[   27.719427]  ? math_error+0x2d0/0x2d0
[   27.723208]  ? __sync_dirty_buffer+0x166/0x290
[   27.727764]  ? __brelse+0x43/0x60
[   27.731198]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   27.736024]  invalid_op+0x1b/0x40
[   27.739460]  ? drop_nlink+0x7d/0xd0
[   27.743063]  ? vfat_rmdir+0x27a/0x3e0
[   27.746842]  ? vfat_lookup+0x550/0x550
[   27.750724]  ? vfs_rmdir.part.0+0x144/0x390
[   27.755023]  ? do_rmdir+0x334/0x3c0
[   27.758644]  ? kern_path_create+0x40/0x40
[   27.762801]  ? _raw_spin_unlock_irq+0x24/0x80
[   27.767280]  ? do_syscall_64+0x4c/0x640
[   27.771233]  ? SyS_mkdir+0x20/0x20
[   27.774747]  ? do_syscall_64+0x1d5/0x640
[   27.778791]  ? entry_SYSCALL_64_after_hwframe+0x5e/0xd3
[   27.784454] Kernel Offset: disabled
[   27.788105] Rebooting in 86400 seconds..