https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4386/fi-cnl-y3/igt@gvt_basic@invalid-placeholder-test.html

run.log say owatch timeout:
running: igt/gvt_basic/invalid-placeholder-test

[284/285] skip: 25, pass: 259 |                
owatch: TIMEOUT!
owatch: timeout for /dev/watchdog0 set to 10 (requested 10)

However, From dmesg and pstore there is another backtrace:

<7>[  536.051747] [IGT] gvt_basic: executing
...

<4>[  558.607125] ------------[ cut here ]------------
<4>[  558.607134] DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock))
<4>[  558.607142] WARNING: CPU: 0 PID: 4636 at kernel/locking/mutex-debug.c:103 mutex_destroy+0x49/0x50
<4>[  558.607161] Modules linked in: i915(-) vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core snd_pcm e1000e mei_me mei prime_numbers [last unloaded: snd_hda_intel]
<4>[  558.607207] CPU: 0 PID: 4636 Comm: gvt_basic Tainted: G     U           4.16.0-rc7-CI-CI_DRM_3992+ #1
<4>[  558.607217] Hardware name: Intel Corporation CannonLake Client Platform/CannonLake Y LPDDR4 RVP, BIOS CNLSFWR1.R00.X122.B01.1801151045 01/15/2018
<4>[  558.607230] RIP: 0010:mutex_destroy+0x49/0x50
<4>[  558.607236] RSP: 0018:ffffc90000ac7db8 EFLAGS: 00010296
<4>[  558.607243] RAX: 000000000000002a RBX: ffff880258ae6b98 RCX: 0000000000000001
<4>[  558.607250] RDX: 0000000080000001 RSI: 0000000000000001 RDI: 00000000ffffffff
<4>[  558.607257] RBP: ffff88025b350008 R08: 0000000000000000 R09: 0000000000000000
<4>[  558.607265] R10: 0000000000000000 R11: ffffffff810ec1eb R12: ffffffffa032d7e0
<4>[  558.607272] R13: ffffffffa032d850 R14: ffff880264d52ef8 R15: ffffffffa032d8d0
<4>[  558.607280] FS:  00007f1a2988a980(0000) GS:ffff88026f800000(0000) knlGS:0000000000000000
<4>[  558.607289] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  558.607295] CR2: 00007f8e46b42e80 CR3: 000000024cc5e004 CR4: 0000000000760ef0
<4>[  558.607302] PKRU: 55555554
<4>[  558.607306] Call Trace:
<4>[  558.607313]  drm_fb_helper_fini.part.13+0xb7/0x100
<4>[  558.607357]  intel_fbdev_fini+0x20/0x80 [i915]
<4>[  558.607399]  intel_modeset_cleanup+0x82/0x110 [i915]
<4>[  558.607429]  i915_driver_unload+0x98/0x110 [i915]
<4>[  558.607459]  i915_pci_remove+0x10/0x20 [i915]
<4>[  558.607466]  pci_device_remove+0x31/0xa0
<4>[  558.607472]  device_release_driver_internal+0x15b/0x230
<4>[  558.607480]  driver_detach+0x35/0x70
<4>[  558.607486]  bus_remove_driver+0x53/0xd0
<4>[  558.607492]  pci_unregister_driver+0x39/0xa0
<4>[  558.607500]  SyS_delete_module+0x180/0x1d0
<4>[  558.607506]  ? do_syscall_64+0x19/0x1a0
<4>[  558.607512]  ? trace_hardirqs_on_caller+0xde/0x1c0
<4>[  558.607518]  do_syscall_64+0x65/0x1a0
<4>[  558.607524]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
<4>[  558.607530] RIP: 0033:0x7f1a28f3f1b7
<4>[  558.607535] RSP: 002b:00007fff1a7a35f8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
<4>[  558.607544] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1a28f3f1b7
<4>[  558.607551] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055f58b01e098
<4>[  558.607559] RBP: 000055f58b01e030 R08: 000055f58b01e09c R09: 00007fff1a7a3638
<4>[  558.607566] R10: 00007fff1a7a25f4 R11: 0000000000000206 R12: 000055f58a51cb00
<4>[  558.607573] R13: 00007fff1a7a38a0 R14: 0000000000000000 R15: 0000000000000000
<4>[  558.607583] Code: 00 00 00 5b c3 e8 78 ec 37 00 85 c0 74 ed 8b 05 2e 77 60 02 85 c0 75 e3 48 c7 c6 0e d6 07 82 48 c7 c7 d3 c4 06 82 e8 07 80 fa ff <0f> 0b eb cc 0f 1f 00 48 b8 11 11 11 11 11 11 11 11 48 89 76 20 
<4>[  558.607646] WARNING: CPU: 0 PID: 4636 at kernel/locking/mutex-debug.c:103 mutex_destroy+0x49/0x50
<4>[  558.607655] ---[ end trace 92fdd645f35b51bd ]---
<7>[  558.622121] [drm:drm_dp_read_desc] DP sink: OUI 38-ec-11 dev-ID  HW-rev 0.0 SW-rev 0.0 quirks 0x0000
<7>[  558.646119] [drm:drm_add_display_info] non_desktop set to 0
<7>[  558.646153] [drm:drm_add_edid_modes] ELD: no CEA Extension found
<7>[  558.646160] [drm:drm_add_display_info] non_desktop set to 0
<7>[  558.646222] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:101:eDP-1] probed modes :
<7>[  558.646232] [drm:drm_mode_debug_printmodeline] Modeline 102:"3840x2160" 60 533250 3840 3888 3920 4000 2160 2163 2168 2222 0x48 0xa
<7>[  558.646266] [drm:drm_mode_debug_printmodeline] Modeline 103:"3840x2160" 48 426600 3840 3888 3920 4000 2160 2163 2168 2222 0x40 0xa
<4>[  558.646279] general protection fault: 0000 [#1] PREEMPT SMP PTI
<0>[  558.646286] Dumping ftrace buffer:
<0>[  558.646291] ---------------------------------
<0>[  558.646336] CPU:1 [LOST 2227725 EVENTS]
                  prime_vg-3966    1.... 504848333us : reset_all_global_seqno.part.6: rcs0 seqno 0 -> 0
<0>[  558.646411] prime_vg-3966    1.... 504848533us : reset_all_global_seqno.part.6: bcs0 seqno 0 -> 0
...
<0>[  558.659768] gvt_basi-4636    3.... 536295821us : intel_gpu_reset: engine_mask=ffffffff
<0>[  558.659776] ---------------------------------
<4>[  558.659781] Modules linked in: i915(-) vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core snd_pcm e1000e mei_me mei prime_numbers [last unloaded: snd_hda_intel]
<4>[  558.659819] CPU: 3 PID: 2885 Comm: kworker/3:4 Tainted: G     U  W        4.16.0-rc7-CI-CI_DRM_3992+ #1
<4>[  558.659827] Hardware name: Intel Corporation CannonLake Client Platform/CannonLake Y LPDDR4 RVP, BIOS CNLSFWR1.R00.X122.B01.1801151045 01/15/2018
<4>[  558.659839] Workqueue: events output_poll_execute
<4>[  558.659847] RIP: 0010:drm_setup_crtcs+0x13f/0xc50
<4>[  558.659852] RSP: 0018:ffffc90000847d48 EFLAGS: 00010202
<4>[  558.659858] RAX: 6b6b6b6b6b6b6b6b RBX: ffff880258ae6a48 RCX: 0000000000000001
<4>[  558.659864] RDX: 0000000000000870 RSI: 0000000000000f00 RDI: 00000000ffffffff
<4>[  558.659871] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
<4>[  558.659877] R10: 0000000000000f00 R11: ffffffff810ec1eb R12: 0000000000000002
<4>[  558.659884] R13: 0000000000000f00 R14: 0000000000000870 R15: ffff88024d7b6458
<4>[  558.659891] FS:  0000000000000000(0000) GS:ffff88026f980000(0000) knlGS:0000000000000000
<4>[  558.659899] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  558.659904] CR2: 00007f8e46b3a050 CR3: 0000000005210003 CR4: 0000000000760ee0
<4>[  558.659911] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>[  558.659918] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<4>[  558.659924] PKRU: 55555554
<4>[  558.659927] Call Trace:
<4>[  558.659934]  ? drm_fb_helper_is_bound.isra.8+0x6e/0xa0
<4>[  558.659941]  drm_fb_helper_hotplug_event.part.20+0x71/0xa0
<4>[  558.659948]  output_poll_execute+0x8d/0x180
<4>[  558.659955]  process_one_work+0x215/0x620
<4>[  558.659962]  worker_thread+0x48/0x3a0
<4>[  558.659968]  ? _raw_spin_unlock_irqrestore+0x4c/0x60
<4>[  558.659974]  kthread+0xfb/0x130
<4>[  558.659979]  ? process_one_work+0x620/0x620
<4>[  558.659984]  ? _kthread_create_on_node+0x30/0x30
<4>[  558.659990]  ret_from_fork+0x3a/0x50
<4>[  558.659996] Code: 45 31 e4 45 85 c0 0f 8e da 07 00 00 44 8b 6c 24 30 44 8b 74 24 40 48 8b 43 30 49 63 d4 44 89 ee 41 83 c4 01 48 8b 04 d0 44 89 f2 <48> 8b 38 48 8b 87 a8 01 00 00 ff 50 20 01 c5 44 3b 63 20 7c d6 
<1>[  558.660052] RIP: drm_setup_crtcs+0x13f/0xc50 RSP: ffffc90000847d48
<4>[  558.660070] ---[ end trace 92fdd645f35b51be ]---
<7>[  559.620240] [drm:intel_edp_drrs_downclock_work [i915]] eDP Refresh Rate set to : 48Hz
<7>[  561.668336] [drm:edp_panel_vdd_off_sync [i915]] Turning eDP port A VDD off
<7>[  561.668535] [drm:edp_panel_vdd_off_sync [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000067
<3>[  568.836232] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:51:pipe A] flip_done timed out
<3>[  579.076225] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:75:pipe B] flip_done timed out
<3>[  589.316212] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:28:plane 1A] flip_done timed out
<3>[  599.556230] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:52:plane 1B] flip_done timed out
<3>[  609.796194] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:51:pipe A] flip_done timed out
<3>[  620.036211] [drm:drm_atomic_helper_wait_for_flip_done] *ERROR* [CRTC:75:pipe B] flip_done timed out
<7>[  620.036325] [drm:intel_edp_drrs_flush [i915]] eDP Refresh Rate set to : 60Hz
<4>[  620.036447] ------------[ cut here ]------------
<4>[  620.036459] WARN_ON(fbc->crtc->active)
<4>[  620.036556] WARNING: CPU: 0 PID: 4636 at drivers/gpu/drm/i915/intel_fbc.c:1247 intel_fbc_global_disable+0x6b/0x70 [i915]
<4>[  620.036587] Modules linked in: i915(-) vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core snd_pcm e1000e mei_me mei prime_numbers [last unloaded: snd_hda_intel]
<4>[  620.036673] CPU: 0 PID: 4636 Comm: gvt_basic Tainted: G     UD W        4.16.0-rc7-CI-CI_DRM_3992+ #1
<4>[  620.036692] Hardware name: Intel Corporation CannonLake Client Platform/CannonLake Y LPDDR4 RVP, BIOS CNLSFWR1.R00.X122.B01.1801151045 01/15/2018
<4>[  620.036786] RIP: 0010:intel_fbc_global_disable+0x6b/0x70 [i915]
<4>[  620.036800] RSP: 0018:ffffc90000ac7dd8 EFLAGS: 00010292
<4>[  620.036814] RAX: 000000000000001a RBX: ffff88025a670000 RCX: 0000000000000001
<4>[  620.036830] RDX: 0000000080000001 RSI: 0000000000000001 RDI: 00000000ffffffff
<4>[  620.036845] RBP: ffff88025a6779c0 R08: 0000000000000000 R09: 00