Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts.
syzkaller login: [   28.160107] IPVS: ftp: loaded support on port[0] = 21
executing program
[   28.243443] NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024)
[   28.264234] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
[   28.278001] ------------[ cut here ]------------
[   28.282833] WARNING: CPU: 1 PID: 8032 at fs/nilfs2/dat.c:195 nilfs_dat_commit_end+0x469/0x5c0
[   28.291483] Kernel panic - not syncing: panic_on_warn set ...
[   28.291483] 
[   28.298843] CPU: 1 PID: 8032 Comm: segctord Not tainted 4.14.295-syzkaller #0
[   28.306100] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
[   28.315432] Call Trace:
[   28.318003]  dump_stack+0x1b2/0x281
[   28.321613]  panic+0x1f9/0x42d
[   28.324785]  ? add_taint.cold+0x16/0x16
[   28.328745]  ? nilfs_dat_commit_end+0x469/0x5c0
[   28.333395]  ? nilfs_dat_commit_end+0x469/0x5c0
[   28.338046]  __warn.cold+0x20/0x44
[   28.341569]  ? ist_end_non_atomic+0x10/0x10
[   28.345872]  ? nilfs_dat_commit_end+0x469/0x5c0
[   28.350521]  report_bug+0x208/0x250
[   28.354128]  do_error_trap+0x195/0x2d0
[   28.357996]  ? math_error+0x2d0/0x2d0
[   28.361783]  ? lock_acquire+0x170/0x3f0
[   28.365737]  ? lock_downgrade+0x740/0x740
[   28.369865]  ? nilfs_palloc_get_block+0x1df/0x250
[   28.374694]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.379520]  invalid_op+0x1b/0x40
[   28.382955] RIP: 0010:nilfs_dat_commit_end+0x469/0x5c0
[   28.388214] RSP: 0018:ffff8880959a78c0 EFLAGS: 00010297
[   28.393557] RAX: ffff8880b3248340 RBX: ffff8880999c9a40 RCX: 1ffff11013510dc9
[   28.400807] RDX: 0000000000000000 RSI: 0000000000000012 RDI: ffff88809a8877b8
[   28.408058] RBP: ffff8880959a7968 R08: ffff88808d67f7c0 R09: 0000000000000002
[   28.415309] R10: 0000000000000000 R11: ffff8880b3248340 R12: ffff88808d67c9c8
[   28.422648] R13: ffff8880959a7980 R14: 0000000000000003 R15: 000023d50af30002
[   28.429917]  nilfs_dat_commit_update+0x26/0x40
[   28.434481]  nilfs_direct_propagate+0x1d4/0x270
[   28.439130]  ? nilfs_direct_lookup_contig+0x280/0x280
[   28.444300]  ? lock_acquire+0x170/0x3f0
[   28.448252]  ? nilfs_bmap_propagate+0x21/0x160
[   28.452817]  nilfs_bmap_propagate+0x73/0x160
[   28.457208]  nilfs_collect_file_data+0x41/0xb0
[   28.461772]  nilfs_segctor_apply_buffers+0x191/0x450
[   28.466856]  ? nilfs_collect_dat_data+0xb0/0xb0
[   28.471503]  nilfs_segctor_scan_file+0x366/0x630
[   28.476239]  ? mark_buffer_dirty+0x337/0x480
[   28.480630]  ? nilfs_collect_file_data+0xb0/0xb0
[   28.485369]  ? rcu_lockdep_current_cpu_online+0xed/0x140
[   28.490803]  nilfs_segctor_do_construct+0x20f0/0x78d0
[   28.495989]  ? nilfs_segctor_scan_file+0x630/0x630
[   28.500983]  ? lock_acquire+0x170/0x3f0
[   28.504938]  ? lock_downgrade+0x740/0x740
[   28.509066]  ? do_raw_spin_unlock+0x164/0x220
[   28.513544]  ? _raw_spin_unlock+0x29/0x40
[   28.517676]  nilfs_segctor_construct+0x6db/0x8e0
[   28.522414]  nilfs_segctor_thread+0x3ad/0xdb0
[   28.526892]  ? nilfs_segctor_construct+0x8e0/0x8e0
[   28.531800]  ? __schedule+0x1450/0x1de0
[   28.535759]  ? wait_woken+0x230/0x230
[   28.539543]  ? nilfs_segctor_construct+0x8e0/0x8e0
[   28.544450]  kthread+0x30d/0x420
[   28.547800]  ? kthread_create_on_node+0xd0/0xd0
[   28.552450]  ret_from_fork+0x24/0x30
[   28.556454] Kernel Offset: disabled
[   28.560107] Rebooting in 86400 seconds..