[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.898024] audit: type=1800 audit(1546120630.504:25): pid=8002 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 41.931360] audit: type=1800 audit(1546120630.504:26): pid=8002 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 41.953105] audit: type=1800 audit(1546120630.504:27): pid=8002 uid=0 auid=4294967295 ses=4294967295 subj=_ 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: [ 47.764766] sshd (8139) used greatest stack depth: 15720 bytes left Warning: Permanently added '10.128.0.97' (ECDSA) to the list of known hosts. executing program [ 54.540526] FAULT_INJECTION: forcing a failure. [ 54.540526] name failslab, interval 1, probability 0, space 0, times 1 [ 54.552341] CPU: 1 PID: 8153 Comm: syz-executor556 Not tainted 4.20.0+ #174 [ 54.559433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.568768] Call Trace: [ 54.571342] dump_stack+0x1d3/0x2c6 [ 54.574960] ? dump_stack_print_info.cold.1+0x20/0x20 [ 54.580137] ? lock_acquire+0x1ed/0x520 [ 54.584102] should_fail.cold.4+0xa/0x17 [ 54.588152] ? arch_local_save_flags+0x40/0x40 [ 54.592736] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 54.597831] ? graph_lock+0x270/0x270 [ 54.601611] ? graph_lock+0x270/0x270 [ 54.605394] ? __drm_mode_object_find+0x33/0x210 [ 54.610137] ? find_held_lock+0x36/0x1c0 [ 54.614183] ? __lock_is_held+0xb5/0x140 [ 54.618234] ? ___might_sleep+0x1ed/0x300 [ 54.622366] ? arch_local_save_flags+0x40/0x40 [ 54.626947] __should_failslab+0x124/0x180 [ 54.631167] should_failslab+0x9/0x14 [ 54.634955] kmem_cache_alloc_trace+0x2db/0x750 [ 54.639609] ? drm_modeset_backoff+0x790/0x790 [ 54.644180] ? wait_for_completion+0x8a0/0x8a0 [ 54.648749] drm_atomic_state_alloc+0xb8/0x110 [ 54.653314] set_property_atomic+0xbb/0x330 [ 54.657621] ? refcount_add_not_zero_checked+0x330/0x330 [ 54.663056] ? drm_object_property_get_value+0x180/0x180 [ 54.668498] ? mutex_unlock+0xd/0x10 [ 54.672192] ? __drm_mode_object_find+0xb8/0x210 [ 54.676934] drm_mode_obj_set_property_ioctl+0x53a/0x800 [ 54.682374] ? drm_mode_obj_find_prop_id+0x1c0/0x1c0 [ 54.687463] ? lock_downgrade+0x900/0x900 [ 54.691593] ? lock_release+0xa00/0xa00 [ 54.695559] drm_connector_property_set_ioctl+0x1a1/0x2a0 [ 54.701083] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 54.706258] ? drm_lease_owner+0x44/0x60 [ 54.710305] ? drm_is_current_master+0x5c/0x140 [ 54.714962] drm_ioctl_kernel+0x278/0x330 [ 54.719097] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 54.724270] ? drm_setversion+0x8b0/0x8b0 [ 54.728406] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 54.733935] ? _copy_from_user+0xdf/0x150 [ 54.738085] drm_ioctl+0x58f/0xb90 [ 54.741609] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 54.746784] ? drm_version+0x3d0/0x3d0 [ 54.750667] ? proc_fail_nth_write+0x9e/0x210 [ 54.755147] ? proc_cwd_link+0x1d0/0x1d0 [ 54.759192] ? trace_hardirqs_off+0xb8/0x310 [ 54.763590] ? smk_tskacc+0x3dd/0x520 [ 54.767377] ? smack_privileged+0xd0/0xd0 [ 54.771507] ? vfs_write+0x2f3/0x580 [ 54.775206] ? drm_version+0x3d0/0x3d0 [ 54.779075] do_vfs_ioctl+0x1de/0x1790 [ 54.782947] ? __lock_is_held+0xb5/0x140 [ 54.786991] ? ioctl_preallocate+0x300/0x300 [ 54.791382] ? smk_curacc+0x7f/0xa0 [ 54.794997] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.800517] ? smack_file_ioctl+0x210/0x3c0 [ 54.804819] ? fget_raw+0x20/0x20 [ 54.808273] ? smack_file_lock+0x2e0/0x2e0 [ 54.812513] ? do_syscall_64+0x9a/0x820 [ 54.816471] ? do_syscall_64+0x9a/0x820 [ 54.820438] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.825960] ? security_file_ioctl+0x94/0xc0 [ 54.830352] ksys_ioctl+0xa9/0xd0 [ 54.833793] __x64_sys_ioctl+0x73/0xb0 [ 54.837666] do_syscall_64+0x1b9/0x820 [ 54.841553] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 54.846903] ? syscall_return_slowpath+0x5e0/0x5e0 [ 54.851994] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.856827] ? trace_hardirqs_on_caller+0x310/0x310 [ 54.861830] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 54.866872] ? prepare_exit_to_usermode+0x291/0x3b0 [ 54.871893] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.876744] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.881931] RIP: 0033:0x444569 [ 54.885113] Code: 22 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 54.903999] RSP: 002b:00007ffe369ca6f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 54.911691] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444569 [ 54.918958] RDX: 0000000020000000 RSI: 000000004010aeab RDI: 0000000000000004 [ 54.926210] RBP: 00007ffe369ca7a0 R08: 0000000000000001 R09: 00000000004009ce [ 54.933462] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 [ 54.940742] R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 [ 54.949064] [ 54.950695] ================================================ [ 54.956467] WARNING: lock held when returning to user space! [ 54.962241] 4.20.0+ #174 Not tainted [ 54.965931] ------------------------------------------------ [ 54.971704] syz-executor556/8153 is leaving the kernel with locks still held! [ 54.978971] 1 lock held by syz-executor556/8153: [ 54.983717] #0: 000000005100c85c (crtc_ww_class_acquire){+.+.}, at: set_property_atomic+0xb3/0x330