[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.171' (ECDSA) to the list of known hosts. syzkaller login: [ 34.942421] IPVS: ftp: loaded support on port[0] = 21 executing program [ 35.020651] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 35.022650] 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 [ 35.045951] Remounting filesystem read-only [ 35.058856] ------------[ cut here ]------------ [ 35.063915] WARNING: CPU: 1 PID: 8110 at fs/nilfs2/dat.c:186 nilfs_dat_commit_end.cold+0x11/0x18 [ 35.072834] Kernel panic - not syncing: panic_on_warn set ... [ 35.072834] [ 35.080178] CPU: 1 PID: 8110 Comm: syz-executor408 Not tainted 4.19.211-syzkaller #0 [ 35.088089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 35.097422] Call Trace: [ 35.099993] dump_stack+0x1fc/0x2ef [ 35.103695] panic+0x26a/0x50e [ 35.106870] ? __warn_printk+0xf3/0xf3 [ 35.110755] ? nilfs_dat_commit_end.cold+0x11/0x18 [ 35.115681] ? __probe_kernel_read+0x130/0x1b0 [ 35.120279] ? __warn.cold+0x5/0x5a [ 35.123886] ? __warn+0xe4/0x200 [ 35.127235] ? nilfs_dat_commit_end.cold+0x11/0x18 [ 35.132149] __warn.cold+0x20/0x5a [ 35.135668] ? nilfs_dat_commit_end.cold+0x11/0x18 [ 35.140583] report_bug+0x262/0x2b0 [ 35.144192] do_error_trap+0x1d7/0x310 [ 35.148062] ? math_error+0x310/0x310 [ 35.151859] ? __irq_work_queue_local+0x101/0x160 [ 35.156944] ? irq_work_queue+0x29/0x80 [ 35.160918] ? error_entry+0x72/0xd0 [ 35.164618] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.169616] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.174445] invalid_op+0x14/0x20 [ 35.177883] RIP: 0010:nilfs_dat_commit_end.cold+0x11/0x18 [ 35.183401] Code: fa e8 98 4f 69 f9 48 c7 c7 80 df 9e 88 e8 f7 80 fa ff 0f 0b e9 1a 66 b6 fa e8 80 4f 69 f9 48 c7 c7 80 df 9e 88 e8 df 80 fa ff <0f> 0b e9 0e 69 b6 fa e8 68 4f 69 f9 48 c7 c7 80 df 9e 88 e8 c7 80 [ 35.202366] RSP: 0018:ffff8880b3fef4e0 EFLAGS: 00010286 [ 35.207710] RAX: 0000000000000024 RBX: ffff8880ac3dda80 RCX: 0000000000000000 [ 35.214977] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10167fde8e [ 35.222261] RBP: ffff8880b3fef588 R08: 0000000000000024 R09: 0000000000000000 [ 35.229512] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88808dbd89c0 [ 35.236762] R13: 00000026ae000002 R14: ffff8880b3fef5a0 R15: 0000000000000003 [ 35.244049] ? vprintk_func+0x81/0x180 [ 35.247924] nilfs_dat_commit_update+0x26/0x40 [ 35.252487] nilfs_direct_propagate+0x237/0x2f0 [ 35.257224] ? nilfs_direct_lookup_contig+0x310/0x310 [ 35.262402] nilfs_bmap_propagate+0x73/0x170 [ 35.266798] nilfs_collect_file_data+0x45/0xd0 [ 35.271362] nilfs_segctor_apply_buffers+0x14a/0x490 [ 35.276462] ? nilfs_collect_dat_data+0xd0/0xd0 [ 35.281115] nilfs_segctor_scan_file+0x3f4/0x6f0 [ 35.285856] ? nilfs_collect_file_data+0xd0/0xd0 [ 35.290596] ? check_preemption_disabled+0x41/0x280 [ 35.295683] nilfs_segctor_do_construct+0x1101/0x8360 [ 35.300861] ? nilfs_segctor_scan_file+0x6f0/0x6f0 [ 35.305783] ? lock_downgrade+0x720/0x720 [ 35.309930] ? lock_acquire+0x170/0x3c0 [ 35.313885] ? nilfs_segctor_confirm+0xe1/0x180 [ 35.318543] ? do_raw_spin_unlock+0x171/0x230 [ 35.323021] ? _raw_spin_unlock+0x29/0x40 [ 35.327151] nilfs_segctor_construct+0x764/0xae0 [ 35.331978] nilfs_detach_log_writer+0x3b8/0x9f0 [ 35.336716] ? nilfs_clean_segments+0xa60/0xa60 [ 35.341365] ? dispose_list+0x137/0x1f0 [ 35.345320] ? wait_woken+0x250/0x250 [ 35.349106] ? dispose_list+0x1f0/0x1f0 [ 35.353063] nilfs_put_super+0x3f/0x1a0 [ 35.357016] ? nilfs_freeze+0xc0/0xc0 [ 35.360800] generic_shutdown_super+0x144/0x370 [ 35.365450] kill_block_super+0x97/0xf0 [ 35.369421] deactivate_locked_super+0x94/0x160 [ 35.374069] deactivate_super+0x174/0x1a0 [ 35.378198] ? deactivate_locked_super+0x160/0x160 [ 35.383110] ? dput+0x31/0x640 [ 35.386287] cleanup_mnt+0x1a8/0x290 [ 35.389990] task_work_run+0x148/0x1c0 [ 35.393859] do_exit+0xbf3/0x2be0 [ 35.397312] ? lock_downgrade+0x720/0x720 [ 35.401444] ? mm_update_next_owner+0x650/0x650 [ 35.406198] ? up_read+0x17/0x110 [ 35.409638] ? __do_page_fault+0x180/0xd60 [ 35.413876] do_group_exit+0x125/0x310 [ 35.417767] __x64_sys_exit_group+0x3a/0x50 [ 35.422083] do_syscall_64+0xf9/0x620 [ 35.425867] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.431037] RIP: 0033:0x7f97e7b58b69 [ 35.434997] Code: Bad RIP value. [ 35.438349] RSP: 002b:00007ffdea7332c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 35.446133] RAX: ffffffffffffffda RBX: 00007f97e7bd0330 RCX: 00007f97e7b58b69 [ 35.453403] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 35.460653] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f97e7bcae40 [ 35.467914] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f97e7bd0330 [ 35.475163] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 35.482729] Kernel Offset: disabled [ 35.486402] Rebooting in 86400 seconds..