[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.734662][ T26] audit: type=1800 audit(1560655629.464:25): pid=8342 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.779415][ T26] audit: type=1800 audit(1560655629.464:26): pid=8342 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.812288][ T26] audit: type=1800 audit(1560655629.474:27): pid=8342 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 '10.128.10.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 66.197476][ T8498] IPVS: ftp: loaded support on port[0] = 21 [ 66.225446][ T8498] BUG: Dentry 00000000adf7b3b1{i=1,n=/} still in use (2) [unmount of sysfs sysfs] [ 66.235198][ T8498] WARNING: CPU: 1 PID: 8498 at fs/dcache.c:1529 umount_check.cold+0xe9/0x10a [ 66.243951][ T8498] Kernel panic - not syncing: panic_on_warn set ... [ 66.250519][ T8498] CPU: 1 PID: 8498 Comm: syz-executor799 Not tainted 5.2.0-rc4+ #33 [ 66.258564][ T8498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.268597][ T8498] Call Trace: [ 66.271911][ T8498] dump_stack+0x172/0x1f0 [ 66.276224][ T8498] ? d_ancestor+0x60/0x6a [ 66.280534][ T8498] panic+0x2cb/0x744 [ 66.284410][ T8498] ? __warn_printk+0xf3/0xf3 [ 66.288988][ T8498] ? umount_check.cold+0xe9/0x10a [ 66.293987][ T8498] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.300223][ T8498] ? __warn.cold+0x5/0x4d [ 66.304531][ T8498] ? __warn+0xe8/0x1d0 [ 66.308581][ T8498] ? umount_check.cold+0xe9/0x10a [ 66.313581][ T8498] __warn.cold+0x20/0x4d [ 66.317802][ T8498] ? umount_check.cold+0xe9/0x10a [ 66.322820][ T8498] report_bug+0x263/0x2b0 [ 66.327131][ T8498] do_error_trap+0x11b/0x200 [ 66.331706][ T8498] do_invalid_op+0x37/0x50 [ 66.336103][ T8498] ? umount_check.cold+0xe9/0x10a [ 66.341112][ T8498] invalid_op+0x14/0x20 [ 66.345249][ T8498] RIP: 0010:umount_check.cold+0xe9/0x10a [ 66.350858][ T8498] 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 00 00 76 87 e8 11 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 [ 66.370445][ T8498] RSP: 0018:ffff8880844f7bb8 EFLAGS: 00010282 [ 66.376496][ T8498] RAX: 0000000000000050 RBX: ffff888098f6b028 RCX: 0000000000000000 [ 66.384458][ T8498] RDX: 0000000000000000 RSI: ffffffff815ac956 RDI: ffffed101089ef69 [ 66.392415][ T8498] RBP: ffff8880844f7be8 R08: 0000000000000050 R09: ffff888099698e48 [ 66.400379][ T8498] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809d049e40 [ 66.408332][ T8498] R13: 0000000000000002 R14: 0000000000000001 R15: ffffffff88c939e0 [ 66.416302][ T8498] ? vprintk_func+0x86/0x189 [ 66.420884][ T8498] ? umount_check.cold+0xe9/0x10a [ 66.425892][ T8498] d_walk+0x194/0x950 [ 66.429851][ T8498] ? select_collect+0x420/0x420 [ 66.434687][ T8498] do_one_tree+0x28/0x40 [ 66.438906][ T8498] shrink_dcache_for_umount+0x72/0x170 [ 66.444345][ T8498] generic_shutdown_super+0x6d/0x370 [ 66.449607][ T8498] kill_anon_super+0x3e/0x60 [ 66.454179][ T8498] kernfs_kill_sb+0x165/0x1e3 [ 66.458858][ T8498] sysfs_kill_sb+0x23/0x40 [ 66.463254][ T8498] deactivate_locked_super+0x95/0x100 [ 66.468622][ T8498] deactivate_super+0x1b2/0x1d0 [ 66.473457][ T8498] ? mount_ns+0x1d0/0x1d0 [ 66.477855][ T8498] ? dput+0x38/0x690 [ 66.481734][ T8498] ? dput+0x1e6/0x690 [ 66.485696][ T8498] cleanup_mnt+0xbf/0x160 [ 66.490008][ T8498] __cleanup_mnt+0x16/0x20 [ 66.496083][ T8498] task_work_run+0x145/0x1c0 [ 66.500664][ T8498] exit_to_usermode_loop+0x273/0x2c0 [ 66.505931][ T8498] do_syscall_64+0x58e/0x680 [ 66.510510][ T8498] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.516388][ T8498] RIP: 0033:0x400e80 [ 66.520262][ T8498] Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 4d 18 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 [ 66.539845][ T8498] RSP: 002b:00007ffd650d86c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 66.548246][ T8498] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400e80 [ 66.556217][ T8498] RDX: 00000000004409b9 RSI: 0000000000000000 RDI: 0000000000000004 [ 66.564173][ T8498] RBP: 00000000004a2190 R08: 0000000000000100 R09: 0000000000000100 [ 66.572126][ T8498] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401f00 [ 66.580103][ T8498] R13: 0000000000401f90 R14: 0000000000000000 R15: 0000000000000000 [ 66.589827][ T8498] Kernel Offset: disabled [ 66.594242][ T8498] Rebooting in 86400 seconds..