[ 36.697031] audit: type=1800 audit(1546121210.535:26): pid=7609 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.725796] audit: type=1800 audit(1546121210.535:27): pid=7609 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.755350] audit: type=1800 audit(1546121210.535:28): pid=7609 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. [ 37.226715] audit: type=1800 audit(1546121211.095:29): pid=7609 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 '10.128.15.205' (ECDSA) to the list of known hosts. syzkaller login: [ 47.125079] FAULT_INJECTION: forcing a failure. [ 47.125079] name failslab, interval 1, probability 0, space 0, times 1 [ 47.136988] CPU: 1 PID: 7760 Comm: syz-executor799 Not tainted 4.20.0+ #298 [ 47.144071] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.153409] Call Trace: [ 47.155984] dump_stack+0x1d3/0x2c6 [ 47.159603] ? dump_stack_print_info.cold.1+0x20/0x20 [ 47.164789] ? lock_acquire+0x1ed/0x520 [ 47.168753] ? __drm_mode_object_find+0x33/0x210 [ 47.173500] should_fail.cold.4+0xa/0x17 [ 47.177545] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 47.182629] ? print_usage_bug+0xc0/0xc0 [ 47.186677] ? graph_lock+0x270/0x270 [ 47.190457] ? graph_lock+0x270/0x270 [ 47.194240] ? __drm_mode_object_find+0x33/0x210 [ 47.199020] ? print_usage_bug+0xc0/0xc0 [ 47.203068] ? find_held_lock+0x36/0x1c0 [ 47.207149] ? __lock_is_held+0xb5/0x140 [ 47.211199] ? ___might_sleep+0x1ed/0x300 [ 47.215332] ? arch_local_save_flags+0x40/0x40 [ 47.219904] __should_failslab+0x124/0x180 [ 47.224123] should_failslab+0x9/0x14 [ 47.227902] kmem_cache_alloc_trace+0x2db/0x750 [ 47.232597] ? drm_modeset_backoff+0x790/0x790 [ 47.237179] ? wait_for_completion+0x8a0/0x8a0 [ 47.241748] drm_atomic_state_alloc+0xb8/0x110 [ 47.246312] set_property_atomic+0xbb/0x330 [ 47.250624] ? refcount_add_not_zero_checked+0x330/0x330 [ 47.256056] ? drm_object_property_get_value+0x180/0x180 [ 47.261497] ? mutex_unlock+0xd/0x10 [ 47.265205] ? __drm_mode_object_find+0xb8/0x210 [ 47.269942] drm_mode_obj_set_property_ioctl+0x53a/0x800 [ 47.275376] ? drm_mode_obj_find_prop_id+0x1c0/0x1c0 [ 47.280462] ? lock_downgrade+0x900/0x900 [ 47.284591] ? lock_release+0xa00/0xa00 [ 47.288552] drm_connector_property_set_ioctl+0x1a1/0x2a0 [ 47.294073] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 47.299244] ? drm_lease_owner+0x44/0x60 [ 47.303291] ? drm_is_current_master+0x5c/0x140 [ 47.307944] drm_ioctl_kernel+0x278/0x330 [ 47.312078] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 47.317274] ? drm_setversion+0x8b0/0x8b0 [ 47.321416] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.326935] ? _copy_from_user+0xdf/0x150 [ 47.331066] drm_ioctl+0x58f/0xb90 [ 47.334592] ? drm_connector_set_obj_prop+0x1a0/0x1a0 [ 47.339771] ? drm_version+0x3d0/0x3d0 [ 47.343644] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.349164] ? fget_raw+0x20/0x20 [ 47.352602] ? __sb_end_write+0xd9/0x110 [ 47.356646] ? vfs_write+0x2ad/0x580 [ 47.360349] ? do_fast_syscall_32+0x150/0xfb2 [ 47.364852] drm_compat_ioctl+0x245/0x320 [ 47.368987] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 47.374158] ? compat_drm_setunique+0x10/0x10 [ 47.378636] __ia32_compat_sys_ioctl+0x20e/0x630 [ 47.383378] do_fast_syscall_32+0x34d/0xfb2 [ 47.387687] ? do_int80_syscall_32+0x890/0x890 [ 47.392254] ? entry_SYSENTER_compat+0x68/0x7f [ 47.396830] ? trace_hardirqs_off_caller+0xbb/0x310 [ 47.401829] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.406739] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.411562] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.416391] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.421388] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.426385] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.431408] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.436252] entry_SYSENTER_compat+0x70/0x7f [ 47.440643] RIP: 0023:0xf7f9d849 [ 47.443994] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 47.462882] RSP: 002b:00000000fff159bc EFLAGS: 00000246 ORIG_RAX: 0000000000000036 [ 47.470570] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000004010aeab [ 47.477827] RDX: 0000000020000000 RSI: 00000000fff15b04 RDI: 00000000fff15b0c [ 47.485081] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 47.492338] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 47.499586] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 47.507879] [ 47.509509] ================================================ [ 47.515278] WARNING: lock held when returning to user space! [ 47.521050] 4.20.0+ #298 Not tainted [ 47.524738] ---------