[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 69.318399][ T26] audit: type=1800 audit(1560627865.421:25): pid=9000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 69.366953][ T26] audit: type=1800 audit(1560627865.421:26): pid=9000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 69.400072][ T26] audit: type=1800 audit(1560627865.421:27): pid=9000 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.234' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.539498][ T9155] IPVS: ftp: loaded support on port[0] = 21 [ 81.575874][ T9155] BUG: Dentry 0000000063025f47{i=1,n=/} still in use (2) [unmount of sysfs sysfs] [ 81.585944][ T9155] WARNING: CPU: 1 PID: 9155 at fs/dcache.c:1529 umount_check.cold+0xe9/0x10a [ 81.594720][ T9155] Kernel panic - not syncing: panic_on_warn set ... [ 81.601301][ T9155] CPU: 1 PID: 9155 Comm: syz-executor713 Not tainted 5.2.0-rc4+ #25 [ 81.609261][ T9155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.619329][ T9155] Call Trace: [ 81.622642][ T9155] dump_stack+0x172/0x1f0 [ 81.626965][ T9155] ? umount_check.cold+0x86/0x10a [ 81.631997][ T9155] panic+0x2cb/0x744 [ 81.635890][ T9155] ? __warn_printk+0xf3/0xf3 [ 81.640473][ T9155] ? umount_check.cold+0xe9/0x10a [ 81.645514][ T9155] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.651745][ T9155] ? __warn.cold+0x5/0x4d [ 81.656054][ T9155] ? __warn+0xe8/0x1d0 [ 81.660108][ T9155] ? umount_check.cold+0xe9/0x10a [ 81.665113][ T9155] __warn.cold+0x20/0x4d [ 81.669343][ T9155] ? umount_check.cold+0xe9/0x10a [ 81.674359][ T9155] report_bug+0x263/0x2b0 [ 81.678686][ T9155] do_error_trap+0x11b/0x200 [ 81.683297][ T9155] do_invalid_op+0x37/0x50 [ 81.687704][ T9155] ? umount_check.cold+0xe9/0x10a [ 81.692726][ T9155] invalid_op+0x14/0x20 [ 81.696894][ T9155] RIP: 0010:umount_check.cold+0xe9/0x10a [ 81.702519][ T9155] Code: 89 ff e8 00 5c f0 ff 48 81 c3 68 06 00 00 45 89 e8 4c 89 e1 53 4d 8b 0f 4c 89 f2 4c 89 e6 48 c7 c7 c0 ff 75 87 e8 a1 bd a1 ff <0f> 0b 58 e9 bd 2a ff ff e8 d0 5b f0 ff e9 29 ff ff ff 45 31 f6 e9 [ 81.722457][ T9155] RSP: 0018:ffff88809614fba8 EFLAGS: 00010286 [ 81.728519][ T9155] RAX: 0000000000000050 RBX: ffff8880957e0e28 RCX: 0000000000000000 [ 81.736486][ T9155] RDX: 0000000000000000 RSI: ffffffff815ac956 RDI: ffffed1012c29f67 [ 81.744830][ T9155] RBP: ffff88809614fbd8 R08: 0000000000000050 R09: ffff8880a02c4f08 [ 81.753051][ T9155] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880917801e0 [ 81.761746][ T9155] R13: 0000000000000002 R14: 0000000000000001 R15: ffffffff88c939a0 [ 81.769770][ T9155] ? vprintk_func+0x86/0x189 [ 81.774356][ T9155] ? umount_check.cold+0xe9/0x10a [ 81.779390][ T9155] d_walk+0x194/0x950 [ 81.783362][ T9155] ? select_collect+0x420/0x420 [ 81.788198][ T9155] do_one_tree+0x28/0x40 [ 81.792426][ T9155] shrink_dcache_for_umount+0x72/0x170 [ 81.797903][ T9155] generic_shutdown_super+0x6d/0x370 [ 81.803186][ T9155] kill_anon_super+0x3e/0x60 [ 81.807774][ T9155] kernfs_kill_sb+0x165/0x1e3 [ 81.812450][ T9155] sysfs_kill_sb+0x23/0x40 [ 81.816859][ T9155] deactivate_locked_super+0x95/0x100 [ 81.822220][ T9155] deactivate_super+0x1b2/0x1d0 [ 81.827080][ T9155] ? mount_ns+0x1d0/0x1d0 [ 81.831398][ T9155] ? dput+0x38/0x690 [ 81.835275][ T9155] ? dput+0x1e6/0x690 [ 81.839272][ T9155] cleanup_mnt+0xbf/0x160 [ 81.843604][ T9155] __cleanup_mnt+0x16/0x20 [ 81.848008][ T9155] task_work_run+0x145/0x1c0 [ 81.852627][ T9155] exit_to_usermode_loop+0x273/0x2c0 [ 81.857935][ T9155] do_fast_syscall_32+0xb51/0xd7d [ 81.863235][ T9155] entry_SYSENTER_compat+0x70/0x7f [ 81.868355][ T9155] RIP: 0023:0xf7f9e849 [ 81.877589][ T9155] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 81.897513][ T9155] RSP: 002b:00000000ffa5a5ec EFLAGS: 00000246 ORIG_RAX: 0000000000000006 [ 81.906180][ T9155] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000 [ 81.914173][ T9155] RDX: 0000000000000005 RSI: 00000000080bc218 RDI: 0000000000000000 [ 81.922170][ T9155] RBP: 00000000ffa5a638 R08: 0000000000000000 R09: 0000000000000000 [ 81.930307][ T9155] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 81.938276][ T9155] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 81.947878][ T9155] Kernel Offset: disabled [ 81.952304][ T9155] Rebooting in 86400 seconds..