[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.145' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.180713] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 40.195365] NILFS error (device loop0): nilfs_check_page: bad entry in directory #12: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 [ 40.215752] Remounting filesystem read-only [ 40.220934] ------------[ cut here ]------------ [ 40.226547] WARNING: CPU: 1 PID: 8101 at fs/nilfs2/dat.c:151 nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.235591] Kernel panic - not syncing: panic_on_warn set ... [ 40.235591] [ 40.242949] CPU: 1 PID: 8101 Comm: syz-executor289 Not tainted 4.19.211-syzkaller #0 [ 40.250807] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 40.260139] Call Trace: [ 40.262712] dump_stack+0x1fc/0x2ef [ 40.266324] panic+0x26a/0x50e [ 40.269502] ? __warn_printk+0xf3/0xf3 [ 40.273371] ? nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.278369] ? __probe_kernel_read+0x130/0x1b0 [ 40.282930] ? __warn.cold+0x5/0x5a [ 40.286536] ? __warn+0xe4/0x200 [ 40.289883] ? nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.294884] __warn.cold+0x20/0x5a [ 40.298408] ? io_schedule_timeout+0x140/0x140 [ 40.302969] ? nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.307966] report_bug+0x262/0x2b0 [ 40.311574] do_error_trap+0x1d7/0x310 [ 40.315441] ? math_error+0x310/0x310 [ 40.319235] ? __irq_work_queue_local+0x101/0x160 [ 40.324068] ? irq_work_queue+0x29/0x80 [ 40.328032] ? error_entry+0x72/0xd0 [ 40.331735] ? trace_hardirqs_off_caller+0x6e/0x210 [ 40.336736] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.341564] invalid_op+0x14/0x20 [ 40.344999] RIP: 0010:nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.350602] Code: c1 e8 b0 4f 69 f9 48 c7 c7 80 df 9e 88 e8 0f 81 fa ff 0f 0b e9 20 61 b6 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 [ 40.369479] RSP: 0018:ffff8880b0dbf8e8 EFLAGS: 00010282 [ 40.374827] RAX: 0000000000000024 RBX: ffff8880b0dbf950 RCX: 0000000000000000 [ 40.382086] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed10161b7f0f [ 40.389334] RBP: ffff88808e5a49c0 R08: 0000000000000024 R09: 0000000000000000 [ 40.396581] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000fffffffe [ 40.403828] R13: ffff8880b0dbf968 R14: ffff88808e5a49c0 R15: ffff8880a2cf78c8 [ 40.411084] ? vprintk_func+0x81/0x180 [ 40.414953] ? nilfs_dat_prepare_end.cold+0x11/0x18 [ 40.419951] nilfs_direct_delete+0x20c/0x2d0 [ 40.424339] ? nilfs_direct_gather_data+0x160/0x160 [ 40.429335] ? truncate_inode_pages_range+0x749/0x1b00 [ 40.434588] nilfs_bmap_do_delete+0x225/0x2e0 [ 40.439065] ? nilfs_btnode_abort_change_key+0x150/0x150 [ 40.444493] ? truncate_inode_page+0xc0/0xc0 [ 40.448886] ? lock_acquire+0x170/0x3c0 [ 40.452835] ? nilfs_bmap_truncate+0x7d/0x300 [ 40.457314] nilfs_bmap_truncate+0x109/0x300 [ 40.461702] ? nilfs_bmap_delete+0x100/0x100 [ 40.466095] nilfs_truncate_bmap+0x13d/0x350 [ 40.470483] ? nilfs_writepage+0x280/0x280 [ 40.474717] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 40.479283] nilfs_evict_inode+0x14d/0x440 [ 40.483499] ? nilfs_get_block+0x970/0x970 [ 40.487719] ? nilfs_get_block+0x970/0x970 [ 40.491933] evict+0x2ed/0x760 [ 40.495108] iput+0x4f1/0x860 [ 40.498195] dentry_unlink_inode+0x265/0x320 [ 40.502580] d_delete+0x210/0x280 [ 40.506031] vfs_rmdir.part.0+0x28a/0x3d0 [ 40.510157] do_rmdir+0x3fd/0x490 [ 40.513590] ? __ia32_sys_mkdir+0x80/0x80 [ 40.517716] ? fput+0x2b/0x190 [ 40.520889] ? trace_hardirqs_off_caller+0x6e/0x210 [ 40.525885] ? do_syscall_64+0x21/0x620 [ 40.529842] do_syscall_64+0xf9/0x620 [ 40.533628] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.538798] RIP: 0033:0x7efc3d39a289 [ 40.542489] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 40.561370] RSP: 002b:00007ffc141eac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 [ 40.569058] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007efc3d39a289 [ 40.576304] RDX: 00007efc3d358823 RSI: 0000000000000000 RDI: 0000000020000780 [ 40.583551] RBP: 00007efc3d359af0 R08: 00005555572e82c0 R09: 0000000000000000 [ 40.590798] R10: 00007ffc141eab40 R11: 0000000000000246 R12: 00007efc3d359b80 [ 40.598048] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 40.605594] Kernel Offset: disabled [ 40.609248] Rebooting in 86400 seconds..