[ 39.188000] audit: type=1800 audit(1546827249.637:25): pid=7808 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.208306] audit: type=1800 audit(1546827249.657:26): pid=7808 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.247514] audit: type=1800 audit(1546827249.657:27): pid=7808 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.269497] audit: type=1800 audit(1546827249.657:28): pid=7808 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.97' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.673562] INFO: trying to register non-static key. [ 49.678689] the code is fine but needs lockdep annotation. [ 49.684299] turning off the locking correctness validator. [ 49.689909] CPU: 0 PID: 7959 Comm: syz-executor352 Not tainted 4.20.0+ #13 [ 49.696904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.706242] Call Trace: [ 49.708813] dump_stack+0x1db/0x2d0 [ 49.712418] ? dump_stack_print_info.cold+0x20/0x20 [ 49.717419] ? vprintk_func+0x86/0x189 [ 49.721289] register_lock_class+0x19dc/0x1e60 [ 49.725865] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.730876] ? bpf_prog_kallsyms_find+0xca/0x4b0 [ 49.735609] ? check_noncircular+0x20/0x20 [ 49.739862] ? module_enable_ro.part.0+0xe0/0xe0 [ 49.744601] ? __bpf_trace_xdp_cpumap_enqueue+0x40/0x40 [ 49.749958] ? check_preemption_disabled+0x48/0x290 [ 49.754964] ? lock_downgrade+0x910/0x910 [ 49.759095] ? check_noncircular+0x20/0x20 [ 49.763308] ? rcu_read_unlock_special+0x380/0x380 [ 49.768235] ? check_noncircular+0x20/0x20 [ 49.772451] ? print_usage_bug+0xd0/0xd0 [ 49.776495] ? is_bpf_text_address+0xd3/0x170 [ 49.780970] ? kernel_text_address+0x73/0xf0 [ 49.785360] ? __kernel_text_address+0xd/0x40 [ 49.789882] __lock_acquire+0x149/0x4a30 [ 49.793929] ? print_usage_bug+0xd0/0xd0 [ 49.797972] ? print_usage_bug+0xd0/0xd0 [ 49.802013] ? add_lock_to_list.isra.0+0x1c9/0x450 [ 49.806933] ? mark_held_locks+0x100/0x100 [ 49.811145] ? __lock_acquire+0x572/0x4a30 [ 49.815356] ? __lock_acquire+0x2514/0x4a30 [ 49.819672] ? trace_hardirqs_off_caller+0x300/0x300 [ 49.824755] ? mark_held_locks+0x100/0x100 [ 49.828972] ? mark_held_locks+0x100/0x100 [ 49.833205] ? mark_held_locks+0x100/0x100 [ 49.837420] ? mark_held_locks+0x100/0x100 [ 49.841631] ? add_lock_to_list.isra.0+0x450/0x450 [ 49.846538] ? add_lock_to_list.isra.0+0x450/0x450 [ 49.851451] ? print_usage_bug+0xd0/0xd0 [ 49.855509] ? try_wait_for_completion+0x146/0x190 [ 49.860421] lock_acquire+0x1db/0x570 [ 49.864202] ? __flush_work+0x762/0xa20 [ 49.868159] ? lock_release+0xc40/0xc40 [ 49.872114] ? try_wait_for_completion+0x146/0x190 [ 49.877024] ? trace_hardirqs_off_caller+0x300/0x300 [ 49.882104] ? lockdep_hardirqs_on+0x415/0x5d0 [ 49.886668] __flush_work+0x787/0xa20 [ 49.890450] ? __flush_work+0x762/0xa20 [ 49.894406] ? insert_work+0x620/0x620 [ 49.898280] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.903794] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.909328] ? check_preemption_disabled+0x48/0x290 [ 49.914325] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.919842] ? refcount_sub_and_test_checked+0x1fe/0x2f0 [ 49.925274] ? refcount_inc_not_zero_checked+0x2e0/0x2e0 [ 49.930710] ? __drm_atomic_helper_crtc_destroy_state+0xf3/0x340 [ 49.936855] flush_work+0x18/0x20 [ 49.940290] vkms_atomic_crtc_destroy_state+0x2d/0x40 [ 49.945461] drm_atomic_state_default_clear+0x37c/0xd60 [ 49.950840] drm_atomic_state_clear+0x9d/0xc0 [ 49.955315] __drm_atomic_state_free+0x3c/0xf0 [ 49.959878] drm_atomic_helper_set_config+0xe5/0x160 [ 49.964962] drm_mode_setcrtc+0x73c/0x1870 [ 49.969187] ? drm_mode_getcrtc+0x870/0x870 [ 49.973488] ? drm_unbind_agp+0x20/0x20 [ 49.977443] ? drm_unbind_agp+0x20/0x20 [ 49.981396] ? drm_dev_unregister+0x480/0x480 [ 49.986094] ? drm_lease_owner+0x45/0x60 [ 49.990138] ? drm_is_current_master+0x5c/0x140 [ 49.994788] drm_ioctl_kernel+0x278/0x340 [ 49.998921] ? drm_mode_getcrtc+0x870/0x870 [ 50.003222] ? drm_setversion+0x8c0/0x8c0 [ 50.007352] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.012867] ? _copy_from_user+0xdd/0x150 [ 50.017001] drm_ioctl+0x592/0xb50 [ 50.020520] ? drm_mode_getcrtc+0x870/0x870 [ 50.024823] ? drm_version+0x3d0/0x3d0 [ 50.028693] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.033710] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.039230] ? check_preemption_disabled+0x48/0x290 [ 50.044234] ? drm_version+0x3d0/0x3d0 [ 50.048104] do_vfs_ioctl+0x107b/0x17d0 [ 50.052062] ? putname+0xef/0x130 [ 50.055508] ? ioctl_preallocate+0x2f0/0x2f0 [ 50.060042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.065565] ? __fget_light+0x2db/0x420 [ 50.069540] ? fget_raw+0x20/0x20 [ 50.073002] ? do_syscall_64+0x8c/0x800 [ 50.076960] ? do_syscall_64+0x8c/0x800 [ 50.080927] ? lockdep_hardirqs_on+0x415/0x5d0 [ 50.085490] ? security_file_ioctl+0x93/0xc0 [ 50.089898] ksys_ioctl+0xab/0xd0 [ 50.093338] __x64_sys_ioctl+0x73/0xb0 [ 50.097210] do_syscall_64+0x1a3/0x800 [ 50.101079] ? syscall_return_slowpath+0x5f0/0x5f0 [ 50.105996] ? prepare_exit_to_usermode+0x232/0x3b0 [ 50.110999] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.116017] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.121184] RIP: 0033:0x443e59 [ 50.124358] 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 [ 50.143236] RSP: 002b:00007fffbaa15888 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 50.150927] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443e59 [ 50.158177] RDX: 0000000020000180 RSI: 00000000c06864a2 RDI: 0000000000000003 [ 50.165427] RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0 [ 50.172673] R10: 000000000000000