[ 36.757878] audit: type=1800 audit(1551029709.646:27): pid=7510 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.783613] audit: type=1800 audit(1551029709.646:28): pid=7510 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 37.604253] audit: type=1800 audit(1551029710.556:29): pid=7510 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.623124] audit: type=1800 audit(1551029710.566:30): pid=7510 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.947547] INFO: trying to register non-static key. [ 46.952680] the code is fine but needs lockdep annotation. [ 46.958277] turning off the locking correctness validator. [ 46.964493] CPU: 0 PID: 7662 Comm: syz-executor166 Not tainted 5.0.0-rc7+ #85 [ 46.971750] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.981085] Call Trace: [ 46.983677] dump_stack+0x172/0x1f0 [ 46.987291] register_lock_class+0x1bdc/0x1bf0 [ 46.991868] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 46.996888] ? bpf_prog_kallsyms_find+0x50/0x2c0 [ 47.001638] ? check_noncircular+0x20/0x20 [ 47.005882] ? is_bpf_text_address+0xd3/0x170 [ 47.010366] ? kernel_text_address+0x73/0xf0 [ 47.014769] __lock_acquire+0x11f/0x4700 [ 47.018832] ? check_noncircular+0x20/0x20 [ 47.023065] ? mark_held_locks+0x100/0x100 [ 47.027287] ? __lock_acquire+0x53b/0x4700 [ 47.031519] ? __lock_acquire+0x53b/0x4700 [ 47.035738] ? __lock_acquire+0x53b/0x4700 [ 47.039956] lock_acquire+0x16f/0x3f0 [ 47.043755] ? __flush_work+0x61a/0x840 [ 47.047718] __flush_work+0x640/0x840 [ 47.051499] ? __flush_work+0x61a/0x840 [ 47.055457] ? try_wait_for_completion+0x9a/0xd0 [ 47.060208] ? insert_work+0x3a0/0x3a0 [ 47.064077] ? mark_held_locks+0xb1/0x100 [ 47.068211] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.073728] ? refcount_sub_and_test_checked+0x161/0x1f0 [ 47.079159] ? refcount_inc_checked+0x70/0x70 [ 47.083656] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 47.089115] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 47.095247] flush_work+0x18/0x20 [ 47.098686] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 47.103895] drm_atomic_state_default_clear+0x37c/0xd60 [ 47.109266] drm_atomic_state_clear+0x9d/0xc0 [ 47.113744] __drm_atomic_state_free+0x3c/0xf0 [ 47.118313] drm_atomic_helper_set_config+0xe5/0x160 [ 47.123397] drm_mode_setcrtc+0x613/0x1490 [ 47.127640] ? mark_held_locks+0x100/0x100 [ 47.131886] ? drm_mode_getcrtc+0x870/0x870 [ 47.136216] ? drm_unbind_agp+0x20/0x20 [ 47.140173] ? find_held_lock+0x35/0x130 [ 47.144214] ? drm_unbind_agp+0x20/0x20 [ 47.148174] ? drm_lease_owner+0x45/0x60 [ 47.152217] ? drm_is_current_master+0x5c/0x140 [ 47.156868] drm_ioctl_kernel+0x23b/0x2e0 [ 47.161023] ? drm_mode_getcrtc+0x870/0x870 [ 47.165335] ? drm_setversion+0x8c0/0x8c0 [ 47.169476] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.174996] ? _copy_from_user+0xdd/0x150 [ 47.179135] drm_ioctl+0x545/0xa50 [ 47.182671] ? drm_mode_getcrtc+0x870/0x870 [ 47.186982] ? drm_version+0x3d0/0x3d0 [ 47.190865] ? smack_log+0x415/0x540 [ 47.194565] ? debug_check_no_obj_freed+0x200/0x464 [ 47.199594] ? smk_tskacc+0x2ba/0x390 [ 47.203383] ? drm_version+0x3d0/0x3d0 [ 47.207263] do_vfs_ioctl+0xd6e/0x1390 [ 47.211136] ? smk_curacc+0x7f/0xa0 [ 47.214747] ? ioctl_preallocate+0x210/0x210 [ 47.219144] ? smack_file_ioctl+0x196/0x300 [ 47.223556] ? smack_file_lock+0x240/0x240 [ 47.227774] ? rcu_read_lock_sched_held+0x110/0x130 [ 47.232775] ? kmem_cache_free+0x171/0x260 [ 47.236994] ? do_sys_open+0x31d/0x5d0 [ 47.240867] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.246395] ? security_file_ioctl+0x93/0xc0 [ 47.250784] ksys_ioctl+0xab/0xd0 [ 47.254267] __x64_sys_ioctl+0x73/0xb0 [ 47.258142] do_syscall_64+0x103/0x610 [ 47.262015] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.267184] RIP: 0033:0x443de9 [ 47.270359] 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 [ 47.289249] RSP: 002b:00007fff5a9e9918 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 47.296940] RAX: ffffff