[ 38.684735] audit: type=1800 audit(1546827335.424:26): pid=7731 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.714883] audit: type=1800 audit(1546827335.424:27): pid=7731 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 38.756096] audit: type=1800 audit(1546827335.424:28): pid=7731 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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. [ 39.349882] audit: type=1800 audit(1546827336.124:29): pid=7731 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.225' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.170808] INFO: trying to register non-static key. [ 49.175932] the code is fine but needs lockdep annotation. [ 49.181548] turning off the locking correctness validator. [ 49.187159] CPU: 1 PID: 7883 Comm: syz-executor094 Not tainted 4.20.0+ #13 [ 49.194164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.203498] Call Trace: [ 49.206074] dump_stack+0x1db/0x2d0 [ 49.209681] ? dump_stack_print_info.cold+0x20/0x20 [ 49.214692] ? vprintk_func+0x86/0x189 [ 49.218571] register_lock_class+0x19dc/0x1e60 [ 49.223137] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.228133] ? bpf_prog_kallsyms_find+0xca/0x4b0 [ 49.232866] ? check_noncircular+0x20/0x20 [ 49.237085] ? module_enable_ro.part.0+0xe0/0xe0 [ 49.241837] ? __bpf_trace_xdp_cpumap_enqueue+0x40/0x40 [ 49.247183] ? check_preemption_disabled+0x48/0x290 [ 49.252180] ? lock_downgrade+0x910/0x910 [ 49.256311] ? check_noncircular+0x20/0x20 [ 49.260534] ? rcu_read_unlock_special+0x380/0x380 [ 49.265446] ? check_noncircular+0x20/0x20 [ 49.269662] ? print_usage_bug+0xd0/0xd0 [ 49.273713] ? is_bpf_text_address+0xd3/0x170 [ 49.278195] ? kernel_text_address+0x73/0xf0 [ 49.282585] ? __kernel_text_address+0xd/0x40 [ 49.287063] __lock_acquire+0x149/0x4a30 [ 49.291108] ? print_usage_bug+0xd0/0xd0 [ 49.295148] ? print_usage_bug+0xd0/0xd0 [ 49.299206] ? add_lock_to_list.isra.0+0x1c9/0x450 [ 49.304123] ? mark_held_locks+0x100/0x100 [ 49.308357] ? __lock_acquire+0x572/0x4a30 [ 49.312573] ? __lock_acquire+0x2514/0x4a30 [ 49.316875] ? trace_hardirqs_off_caller+0x300/0x300 [ 49.321959] ? mark_held_locks+0x100/0x100 [ 49.326178] ? mark_held_locks+0x100/0x100 [ 49.330394] ? mark_held_locks+0x100/0x100 [ 49.334611] ? mark_held_locks+0x100/0x100 [ 49.338828] ? add_lock_to_list.isra.0+0x450/0x450 [ 49.343738] ? add_lock_to_list.isra.0+0x450/0x450 [ 49.348648] ? print_usage_bug+0xd0/0xd0 [ 49.352692] ? try_wait_for_completion+0x146/0x190 [ 49.357612] lock_acquire+0x1db/0x570 [ 49.361403] ? __flush_work+0x762/0xa20 [ 49.365370] ? lock_release+0xc40/0xc40 [ 49.369327] ? try_wait_for_completion+0x146/0x190 [ 49.374239] ? trace_hardirqs_off_caller+0x300/0x300 [ 49.379335] ? lockdep_hardirqs_on+0x415/0x5d0 [ 49.383901] __flush_work+0x787/0xa20 [ 49.387685] ? __flush_work+0x762/0xa20 [ 49.391653] ? insert_work+0x620/0x620 [ 49.395524] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.401055] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.406589] ? check_preemption_disabled+0x48/0x290 [ 49.411587] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.417105] ? refcount_sub_and_test_checked+0x1fe/0x2f0 [ 49.422539] ? refcount_inc_not_zero_checked+0x2e0/0x2e0 [ 49.427975] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 49.434103] flush_work+0x18/0x20 [ 49.437540] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 49.442740] drm_atomic_state_default_clear+0x37c/0xd60 [ 49.448089] drm_atomic_state_clear+0x9d/0xc0 [ 49.452578] __drm_atomic_state_free+0x3c/0xf0 [ 49.457143] drm_atomic_helper_set_config+0xe5/0x160 [ 49.462231] drm_mode_setcrtc+0x73c/0x1870 [ 49.466466] ? drm_mode_getcrtc+0x870/0x870 [ 49.470771] ? drm_unbind_agp+0x20/0x20 [ 49.474731] ? drm_unbind_agp+0x20/0x20 [ 49.478684] ? drm_dev_unregister+0x480/0x480 [ 49.483169] ? drm_lease_owner+0x45/0x60 [ 49.487215] ? drm_is_current_master+0x5c/0x140 [ 49.491886] drm_ioctl_kernel+0x278/0x340 [ 49.496019] ? drm_mode_getcrtc+0x870/0x870 [ 49.500322] ? drm_setversion+0x8c0/0x8c0 [ 49.504454] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.509974] ? _copy_from_user+0xdd/0x150 [ 49.514109] drm_ioctl+0x592/0xb50 [ 49.517629] ? drm_mode_getcrtc+0x870/0x870 [ 49.521935] ? drm_version+0x3d0/0x3d0 [ 49.525804] ? trace_hardirqs_on_caller+0x310/0x310 [ 49.530806] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.536325] ? check_preemption_disabled+0x48/0x290 [ 49.541321] ? drm_version+0x3d0/0x3d0 [ 49.545191] do_vfs_ioctl+0x107b/0x17d0 [ 49.549150] ? putname+0xef/0x130 [ 49.552611] ? ioctl_preallocate+0x2f0/0x2f0 [ 49.557005] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.562528] ? __fget_light+0x2db/0x420 [ 49.566485] ? fget_raw+0x20/0x20 [ 49.569922] ? do_syscall_64+0x8c/0x800 [ 49.573876] ? do_syscall_64+0x8c/0x800 [ 49.577832] ? lockdep_hardirqs_on+0x415/0x5d0 [ 49.582403] ? security_file_ioctl+0x93/0xc0 [ 49.586795] ksys_ioctl+0xab/0xd0 [ 49.590232] __x64_sys_ioctl+0x73/0xb0 [ 49.594103] do_syscall_64+0x1a3/0x800 [ 49.597972] ? syscall_return_slowpath+0x5f0/0x5f0 [ 49.602883] ? prepare_exit_to_usermode+0x232/0x3b0 [ 49.607881] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 49.612717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 49.617888] RIP: 0033:0x443e59 [ 49.621073] 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 [ 49.639983] RSP: 002b:00007fffc86c1648 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 49.647678] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e59 [ 49.654928] RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003 [ 49.662176] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 49.669427] R10: 000000000000000f R11: