[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.284823] audit: type=1800 audit(1545730243.315:25): pid=7884 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.323615] audit: type=1800 audit(1545730243.315:26): pid=7884 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.346835] audit: type=1800 audit(1545730243.325:27): pid=7884 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 syzkaller login: [ 45.910723] sshd (8021) used greatest stack depth: 15720 bytes left Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. executing program [ 52.620902] INFO: trying to register non-static key. [ 52.626020] the code is fine but needs lockdep annotation. [ 52.631620] turning off the locking correctness validator. [ 52.637240] CPU: 1 PID: 8035 Comm: syz-executor161 Not tainted 4.20.0-rc7-next-20181224 #188 [ 52.645989] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.655320] Call Trace: [ 52.657889] dump_stack+0x1d3/0x2c6 [ 52.661500] ? dump_stack_print_info.cold.1+0x20/0x20 [ 52.666691] ? vprintk_func+0x85/0x181 [ 52.670559] register_lock_class+0x259d/0x25b0 [ 52.675124] ? __bpf_trace_xdp_cpumap_enqueue+0x40/0x40 [ 52.680466] ? check_noncircular+0x20/0x20 [ 52.684682] ? noop_count+0x40/0x40 [ 52.688296] ? lock_pin_lock+0x350/0x350 [ 52.692339] ? kasan_check_read+0x11/0x20 [ 52.696466] ? check_noncircular+0x20/0x20 [ 52.700678] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 52.705709] ? check_noncircular+0x20/0x20 [ 52.709940] ? module_enable_ro.part.69+0xe0/0xe0 [ 52.714783] ? __bpf_trace_xdp_cpumap_enqueue+0x40/0x40 [ 52.720131] ? kernel_text_address+0x79/0xf0 [ 52.724520] ? is_bpf_text_address+0xac/0x170 [ 52.728994] ? lock_downgrade+0x900/0x900 [ 52.733121] ? lock_release+0xa00/0xa00 [ 52.737073] ? kasan_check_read+0x11/0x20 [ 52.741218] ? rcu_read_unlock_special+0x370/0x370 [ 52.746129] ? print_usage_bug+0xc0/0xc0 [ 52.750169] ? unwind_dump+0x190/0x190 [ 52.754038] ? print_usage_bug+0xc0/0xc0 [ 52.758078] ? kernel_text_address+0x79/0xf0 [ 52.762465] ? print_usage_bug+0xc0/0xc0 [ 52.766502] ? print_usage_bug+0xc0/0xc0 [ 52.770721] __lock_acquire+0x184/0x4c20 [ 52.774760] ? __lock_acquire+0x62f/0x4c20 [ 52.778984] ? add_lock_to_list.isra.26+0x1ec/0x4b0 [ 52.783984] ? mark_held_locks+0x130/0x130 [ 52.788195] ? mark_held_locks+0x130/0x130 [ 52.792410] ? __lock_acquire+0x282a/0x4c20 [ 52.796708] ? mark_held_locks+0x130/0x130 [ 52.800918] ? mark_held_locks+0x130/0x130 [ 52.805134] ? mark_held_locks+0x130/0x130 [ 52.809348] ? mark_held_locks+0x130/0x130 [ 52.813559] ? graph_lock+0x270/0x270 [ 52.817355] ? graph_lock+0x270/0x270 [ 52.821138] ? print_usage_bug+0xc0/0xc0 [ 52.825179] ? trace_hardirqs_on+0xbd/0x310 [ 52.829475] ? kasan_check_read+0x11/0x20 [ 52.833618] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 52.839050] ? graph_lock+0x270/0x270 [ 52.842829] ? print_usage_bug+0xc0/0xc0 [ 52.846875] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 52.851966] ? graph_lock+0x270/0x270 [ 52.855746] ? lockdep_hardirqs_on+0x421/0x5c0 [ 52.860306] ? find_held_lock+0x36/0x1c0 [ 52.864345] lock_acquire+0x1ed/0x520 [ 52.868138] ? __flush_work+0x72d/0x9b0 [ 52.872092] ? lock_release+0xa00/0xa00 [ 52.876073] ? lockdep_hardirqs_on+0x421/0x5c0 [ 52.880632] ? trace_hardirqs_on+0xbd/0x310 [ 52.884931] ? kasan_check_read+0x11/0x20 [ 52.889056] ? try_wait_for_completion+0x149/0x180 [ 52.893965] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 52.899392] ? lockdep_hardirqs_on+0x421/0x5c0 [ 52.903953] __flush_work+0x752/0x9b0 [ 52.907730] ? __flush_work+0x72d/0x9b0 [ 52.911686] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 52.916768] ? graph_lock+0x270/0x270 [ 52.920555] ? try_wait_for_completion+0x149/0x180 [ 52.925463] ? insert_work+0x4c0/0x4c0 [ 52.929326] ? complete_all+0x70/0x70 [ 52.933104] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.938619] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.944138] ? refcount_sub_and_test_checked+0x203/0x310 [ 52.949565] ? refcount_dec_if_one+0x180/0x180 [ 52.954149] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 52.960284] flush_work+0x17/0x20 [ 52.963724] vkms_atomic_crtc_destroy_state+0x2b/0x40 [ 52.968906] drm_atomic_state_default_clear+0x37c/0xda0 [ 52.974267] drm_atomic_state_clear+0x9f/0xd0 [ 52.978762] __drm_atomic_state_free+0x3a/0xf0 [ 52.983333] drm_atomic_helper_set_config+0xe6/0x160 [ 52.988417] drm_mode_setcrtc+0x767/0x1890 [ 52.992635] ? drm_mode_getcrtc+0x870/0x870 [ 52.996933] ? drm_unbind_agp+0x20/0x20 [ 53.000883] ? lock_downgrade+0x900/0x900 [ 53.005009] ? lock_release+0xa00/0xa00 [ 53.008960] ? __might_fault+0x12b/0x1e0 [ 53.013003] ? drm_is_current_master+0x5c/0x140 [ 53.017651] drm_ioctl_kernel+0x278/0x330 [ 53.021785] ? drm_mode_getcrtc+0x870/0x870 [ 53.026089] ? drm_setversion+0x8b0/0x8b0 [ 53.030213] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 53.035729] ? _copy_from_user+0xdf/0x150 [ 53.039855] drm_ioctl+0x58f/0xb90 [ 53.043374] ? drm_mode_getcrtc+0x870/0x870 [ 53.047679] ? drm_version+0x3d0/0x3d0 [ 53.051545] ? trace_hardirqs_off+0xb8/0x310 [ 53.055936] ? kasan_check_read+0x11/0x20 [ 53.060064] ? trace_hardirqs_off+0xb8/0x310 [ 53.064453] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.069969] ? drm_version+0x3d0/0x3d0 [ 53.073836] do_vfs_ioctl+0x1de/0x1790 [ 53.077705] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 53.083222] ? ioctl_preallocate+0x300/0x300 [ 53.087609] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.093124] ? __fget_light+0x2e9/0x430 [ 53.097075] ? fget_raw+0x20/0x20 [ 53.100507] ? rcu_read_lock_sched_held+0x108/0x120 [ 53.105503] ? kmem_cache_free+0x24f/0x290 [ 53.109732] ? putname+0xf7/0x130 [ 53.113168] ? do_syscall_64+0x9a/0x820 [ 53.117123] ? do_syscall_64+0x9a/0x820 [ 53.121084] ? lockdep_hardirqs_on+0x421/0x5c0 [ 53.125655] ? security_file_ioctl+0x94/0xc0 [ 53.130044] ksys_ioctl+0xa9/0xd0 [ 53.133477] __x64_sys_ioctl+0x73/0xb0 [ 53.137342] do_syscall_64+0x1b9/0x820 [ 53.141213] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 53.146573] ? syscall_return_slowpath+0x5e0/0x5e0 [ 53.151481] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.156320] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.161326] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 53.166323] ? prepare_exit_to_usermode+0x291/0x3b0 [ 53.171321] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.176144] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.181311] RIP: 0033:0x443e59 [ 53.184487] 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 [ 53.203365] RSP: 002b:00007ffd67322118 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 53.211056] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e59 [ 53.218333] RDX: 0000000020000100 RSI: 00000000c06864a2 RD