[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.310018] kauditd_printk_skb: 8 callbacks suppressed [ 32.310027] audit: type=1800 audit(1549760592.082:29): pid=7227 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 32.335245] audit: type=1800 audit(1549760592.082:30): pid=7227 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.201' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.530620] INFO: trying to register non-static key. [ 42.535871] the code is fine but needs lockdep annotation. [ 42.541476] turning off the locking correctness validator. [ 42.547083] CPU: 0 PID: 7380 Comm: syz-executor308 Not tainted 5.0.0-rc5+ #65 [ 42.554341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.563827] Call Trace: [ 42.566412] dump_stack+0x172/0x1f0 [ 42.570026] register_lock_class+0x1bdc/0x1bf0 [ 42.574589] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.579596] ? bpf_prog_kallsyms_find+0x50/0x2c0 [ 42.584333] ? check_noncircular+0x20/0x20 [ 42.588570] ? is_bpf_text_address+0xd3/0x170 [ 42.593063] ? kernel_text_address+0x73/0xf0 [ 42.597450] __lock_acquire+0x11f/0x4700 [ 42.601497] ? check_noncircular+0x20/0x20 [ 42.605718] ? mark_held_locks+0x100/0x100 [ 42.609933] ? __lock_acquire+0x53b/0x4700 [ 42.614147] ? __lock_acquire+0x53b/0x4700 [ 42.618370] ? __lock_acquire+0x53b/0x4700 [ 42.622584] lock_acquire+0x16f/0x3f0 [ 42.626371] ? __flush_work+0x61a/0x840 [ 42.630327] __flush_work+0x640/0x840 [ 42.634107] ? __flush_work+0x61a/0x840 [ 42.638062] ? try_wait_for_completion+0x9a/0xd0 [ 42.642800] ? insert_work+0x3a0/0x3a0 [ 42.646668] ? mark_held_locks+0xb1/0x100 [ 42.650799] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.656317] ? refcount_sub_and_test_checked+0x161/0x1f0 [ 42.661744] ? refcount_inc_checked+0x70/0x70 [ 42.666338] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 42.671815] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 42.677950] flush_work+0x18/0x20 [ 42.681395] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 42.686575] drm_atomic_state_default_clear+0x37c/0xd60 [ 42.691922] drm_atomic_state_clear+0x9d/0xc0 [ 42.696405] __drm_atomic_state_free+0x3c/0xf0 [ 42.700970] drm_atomic_helper_set_config+0xe5/0x160 [ 42.706051] drm_mode_setcrtc+0x613/0x1490 [ 42.710269] ? mark_held_locks+0x100/0x100 [ 42.714487] ? drm_mode_getcrtc+0x870/0x870 [ 42.718804] ? drm_unbind_agp+0x20/0x20 [ 42.722780] ? find_held_lock+0x35/0x130 [ 42.726823] ? drm_unbind_agp+0x20/0x20 [ 42.730784] ? drm_lease_owner+0x45/0x60 [ 42.734848] ? drm_is_current_master+0x5c/0x140 [ 42.739508] drm_ioctl_kernel+0x23b/0x2e0 [ 42.743639] ? drm_mode_getcrtc+0x870/0x870 [ 42.747947] ? drm_setversion+0x8c0/0x8c0 [ 42.752078] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.757601] ? _copy_from_user+0xdd/0x150 [ 42.761826] drm_ioctl+0x545/0xa50 [ 42.765374] ? drm_mode_getcrtc+0x870/0x870 [ 42.769694] ? drm_version+0x3d0/0x3d0 [ 42.773568] ? debug_check_no_obj_freed+0x200/0x464 [ 42.778588] ? trace_hardirqs_off+0x62/0x220 [ 42.782978] ? drm_version+0x3d0/0x3d0 [ 42.786861] do_vfs_ioctl+0xd6e/0x1390 [ 42.790731] ? ioctl_preallocate+0x210/0x210 [ 42.795124] ? putname+0xef/0x130 [ 42.798569] ? rcu_read_lock_sched_held+0x110/0x130 [ 42.803576] ? kmem_cache_free+0x225/0x260 [ 42.807802] ? putname+0xf4/0x130 [ 42.811243] ? do_sys_open+0x31d/0x5d0 [ 42.815114] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.820636] ? security_file_ioctl+0x93/0xc0 [ 42.825049] ksys_ioctl+0xab/0xd0 [ 42.828483] __x64_sys_ioctl+0x73/0xb0 [ 42.832356] do_syscall_64+0x103/0x610 [ 42.836232] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.841406] RIP: 0033:0x443de9 [ 42.844585] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 42.863466] RSP: 002b:00007ffe127ba878 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 42.871252] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443de9 [ 42.878515] RDX: 0000000020000180 RSI: 00