[ 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 '10.128.0.154' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.314625] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 29.326376] 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 [ 29.348349] Remounting filesystem read-only [ 29.353295] ------------[ cut here ]------------ [ 29.358109] WARNING: CPU: 0 PID: 7980 at fs/nilfs2/dat.c:160 nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.366831] Kernel panic - not syncing: panic_on_warn set ... [ 29.366831] [ 29.374170] CPU: 0 PID: 7980 Comm: syz-executor160 Not tainted 4.14.295-syzkaller #0 [ 29.382023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 29.391357] Call Trace: [ 29.393922] dump_stack+0x1b2/0x281 [ 29.397527] panic+0x1f9/0x42d [ 29.400697] ? add_taint.cold+0x16/0x16 [ 29.404648] ? nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.409377] ? nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.414104] __warn.cold+0x20/0x44 [ 29.417621] ? ist_end_non_atomic+0x10/0x10 [ 29.421918] ? nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.426735] report_bug+0x208/0x250 [ 29.430337] do_error_trap+0x195/0x2d0 [ 29.434200] ? math_error+0x2d0/0x2d0 [ 29.437979] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.442799] invalid_op+0x1b/0x40 [ 29.446228] RIP: 0010:nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.451559] RSP: 0018:ffff888095d8f968 EFLAGS: 00010297 [ 29.456898] RAX: ffff88809c6fe1c0 RBX: ffff888095d8f9d0 RCX: 61c8864680b583eb [ 29.464139] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88808df1ba38 [ 29.471384] RBP: ffff888095d8f9e8 R08: 0000000000000000 R09: 0000000000000005 [ 29.478626] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffffe [ 29.485867] R13: ffff88808df1f9c8 R14: ffff88808df1f9c8 R15: ffff88808df1a1b0 [ 29.493121] ? nilfs_dat_prepare_end+0x1e8/0x2e0 [ 29.497851] nilfs_direct_delete+0x1b7/0x250 [ 29.502233] ? nilfs_direct_gather_data+0x130/0x130 [ 29.507223] ? trace_hardirqs_on+0x10/0x10 [ 29.511431] nilfs_bmap_do_delete+0x1d8/0x280 [ 29.515907] ? nilfs_btnode_abort_change_key+0x140/0x140 [ 29.521339] ? lock_acquire+0x170/0x3f0 [ 29.525285] ? nilfs_bmap_truncate+0x6d/0x280 [ 29.529755] nilfs_bmap_truncate+0xe9/0x280 [ 29.534049] ? nilfs_bmap_delete+0xf0/0xf0 [ 29.538257] ? up_read+0x17/0x30 [ 29.541599] nilfs_truncate_bmap+0x101/0x2c0 [ 29.545980] ? nilfs_writepage+0x260/0x260 [ 29.550191] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 29.555184] nilfs_evict_inode+0x11b/0x3a0 [ 29.559393] ? nilfs_get_block+0x7a0/0x7a0 [ 29.563606] ? nilfs_get_block+0x7a0/0x7a0 [ 29.567820] evict+0x2c8/0x700 [ 29.570990] iput+0x458/0x7e0 [ 29.574073] dentry_unlink_inode+0x25c/0x310 [ 29.578453] d_delete+0x1c5/0x280 [ 29.581884] vfs_rmdir.part.0+0x260/0x390 [ 29.586009] do_rmdir+0x334/0x3c0 [ 29.589435] ? kern_path_create+0x40/0x40 [ 29.593559] ? __close_fd+0x159/0x230 [ 29.597335] ? do_syscall_64+0x4c/0x640 [ 29.601280] ? SyS_mkdir+0x20/0x20 [ 29.604793] do_syscall_64+0x1d5/0x640 [ 29.608659] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.613823] RIP: 0033:0x7f2fff57c289 [ 29.617514] RSP: 002b:00007ffe7a12ead8 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 [ 29.625203] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f2fff57c289 [ 29.632451] RDX: 00007f2fff53a823 RSI: 0000000000000000 RDI: 0000000020000780 [ 29.639694] RBP: 00007f2fff53baf0 R08: 0000555556e662c0 R09: 0000000000000000 [ 29.647035] R10: 00007ffe7a12e9a0 R11: 0000000000000246 R12: 00007f2fff53bb80 [ 29.654281] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 29.661809] Kernel Offset: disabled [ 29.665573] Rebooting in 86400 seconds..