[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.23' (ECDSA) to the list of known hosts. syzkaller login: [ 27.990186] IPVS: ftp: loaded support on port[0] = 21 executing program [ 28.096805] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 28.110828] NILFS error (device loop0): nilfs_check_page: bad entry in directory #2: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 [ 28.126374] Remounting filesystem read-only [ 28.140812] ------------[ cut here ]------------ [ 28.145673] WARNING: CPU: 0 PID: 7973 at fs/nilfs2/dat.c:195 nilfs_dat_commit_end+0x469/0x5c0 [ 28.154316] Kernel panic - not syncing: panic_on_warn set ... [ 28.154316] [ 28.161658] CPU: 0 PID: 7973 Comm: syz-executor125 Not tainted 4.14.295-syzkaller #0 [ 28.169524] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 28.178868] Call Trace: [ 28.181446] dump_stack+0x1b2/0x281 [ 28.185059] panic+0x1f9/0x42d [ 28.188233] ? add_taint.cold+0x16/0x16 [ 28.192188] ? nilfs_dat_commit_end+0x469/0x5c0 [ 28.196839] ? nilfs_dat_commit_end+0x469/0x5c0 [ 28.201485] __warn.cold+0x20/0x44 [ 28.205034] ? ist_end_non_atomic+0x10/0x10 [ 28.209338] ? nilfs_dat_commit_end+0x469/0x5c0 [ 28.214002] report_bug+0x208/0x250 [ 28.217611] do_error_trap+0x195/0x2d0 [ 28.221474] ? math_error+0x2d0/0x2d0 [ 28.225259] ? lock_acquire+0x170/0x3f0 [ 28.229212] ? lock_downgrade+0x740/0x740 [ 28.233340] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.238162] invalid_op+0x1b/0x40 [ 28.241594] RIP: 0010:nilfs_dat_commit_end+0x469/0x5c0 [ 28.246842] RSP: 0018:ffff888095c5f5f8 EFLAGS: 00010297 [ 28.252183] RAX: ffff8880b39c04c0 RBX: ffff8880a919ea80 RCX: 1ffff1101694e529 [ 28.259433] RDX: 0000000000000000 RSI: 0000000000000014 RDI: ffff8880b4a732b8 [ 28.266684] RBP: ffff888095c5f6a0 R08: ffff88808dea10a8 R09: 0000000000000003 [ 28.273941] R10: 0000000000000000 R11: ffff8880b39c04c0 R12: ffff88808dea09c8 [ 28.281195] R13: ffff888095c5f6b8 R14: 0000000000000003 R15: 00000026ae000002 [ 28.288466] ? nilfs_dat_commit_end+0x469/0x5c0 [ 28.293121] nilfs_dat_commit_update+0x26/0x40 [ 28.297682] nilfs_direct_propagate+0x1d4/0x270 [ 28.302330] ? nilfs_direct_lookup_contig+0x280/0x280 [ 28.307499] ? lock_acquire+0x170/0x3f0 [ 28.311452] ? nilfs_bmap_propagate+0x21/0x160 [ 28.316017] nilfs_bmap_propagate+0x73/0x160 [ 28.320405] nilfs_collect_file_data+0x41/0xb0 [ 28.324969] nilfs_segctor_apply_buffers+0x191/0x450 [ 28.330050] ? nilfs_collect_dat_data+0xb0/0xb0 [ 28.334696] nilfs_segctor_scan_file+0x366/0x630 [ 28.339427] ? mark_buffer_dirty+0x337/0x480 [ 28.343811] ? nilfs_collect_file_data+0xb0/0xb0 [ 28.348545] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 28.353978] nilfs_segctor_do_construct+0x1057/0x78d0 [ 28.359193] ? nilfs_segctor_scan_file+0x630/0x630 [ 28.364102] ? lock_acquire+0x170/0x3f0 [ 28.368055] ? lock_downgrade+0x740/0x740 [ 28.372181] ? do_raw_spin_unlock+0x164/0x220 [ 28.376653] ? _raw_spin_unlock+0x29/0x40 [ 28.380779] nilfs_segctor_construct+0x6db/0x8e0 [ 28.385515] nilfs_detach_log_writer+0x398/0x980 [ 28.390250] ? nilfs_clean_segments+0x990/0x990 [ 28.394898] ? dispose_list+0x11c/0x1e0 [ 28.398851] ? wait_woken+0x230/0x230 [ 28.402631] ? dispose_list+0x1e0/0x1e0 [ 28.406584] nilfs_put_super+0x3f/0x190 [ 28.410542] ? nilfs_freeze+0xb0/0xb0 [ 28.414320] generic_shutdown_super+0x144/0x370 [ 28.418967] kill_block_super+0x95/0xe0 [ 28.422921] deactivate_locked_super+0x6c/0xd0 [ 28.427481] deactivate_super+0x7f/0xa0 [ 28.431435] cleanup_mnt+0x186/0x2c0 [ 28.435132] task_work_run+0x11f/0x190 [ 28.439001] do_exit+0xa44/0x2850 [ 28.442450] ? __do_page_fault+0x571/0xad0 [ 28.446661] ? mm_update_next_owner+0x5b0/0x5b0 [ 28.451313] ? lock_downgrade+0x740/0x740 [ 28.455440] do_group_exit+0x100/0x2e0 [ 28.459308] SyS_exit_group+0x19/0x20 [ 28.463083] ? do_group_exit+0x2e0/0x2e0 [ 28.467119] do_syscall_64+0x1d5/0x640 [ 28.470986] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.476159] RIP: 0033:0x7f1110147b69 [ 28.479846] RSP: 002b:00007ffc820f90b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 28.487531] RAX: ffffffffffffffda RBX: 00007f11101bf330 RCX: 00007f1110147b69 [ 28.494791] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 28.502068] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f11101b9e40 [ 28.509315] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f11101bf330 [ 28.516561] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 28.524200] Kernel Offset: disabled [ 28.527857] Rebooting in 86400 seconds..