[SKL] Few tests - timeout/incomplete - Received signal SIGQUIT, Per-test timeout exceeded. Killing the current test with SIGQUIT.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_11918/shard-skl4/igt@gem_tiled_wb.html

Received signal SIGQUIT.
Stack trace: 
 #0 [fatal_sig_handler+0xd6]
 #1 [killpg+0x40]
 #2 [getpid+0xb]
 #3 [igt_vlog+0x2cf]
 #4 [igt_log+0x8f]
 #5 [main+0x347]
 #6 [__libc_start_main+0xf3]
 #7 [_start+0x2a]

<6> [307.906104] Console: switching to colour dummy device 80x25
<6> [307.906813] [IGT] gem_tiled_wb: executing
<7> [310.407203] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] Turning [ENCODER:94:DDI A/PHY A] VDD off
<7> [310.408793] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000007
<7> [310.412129] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling DC_off
<7> [310.413719] i915 0000:00:02.0: [drm:skl_enable_dc6 [i915]] Enabling DC6
<7> [310.415159] i915 0000:00:02.0: [drm:gen9_set_dc_state.part.15 [i915]] Setting DC state from 00 to 02
<4> [427.704462] [IGT] Per-test timeout exceeded. Killing the current test with SIGQUIT.
<6> [427.704810] sysrq: Show State
<6> [427.706210] task:systemd         state:S stack:12168 pid:    1 ppid:     0 flags:0x00000000
<6> [427.706336] Call Trace:
<6> [427.706365]  <TASK>
<6> [427.706452]  __schedule+0x483/0xb40
<6> [427.706628]  schedule+0x3f/0xb0
<6> [427.706685]  schedule_hrtimeout_range_clock+0x11d/0x130
<6> [427.706739]  ? do_epoll_wait+0x759/0x910
<6> [427.706814]  ? _raw_write_unlock_irq+0x1f/0x50
<6> [427.707433]  ? lockdep_hardirqs_on+0xbf/0x140
<6> [427.708144]  do_epoll_wait+0x76a/0x910
<6> [427.708343]  ? finish_swait+0x90/0x90
<6> [427.708471]  __x64_sys_epoll_wait+0x50/0x90
<6> [427.708517]  ? lockdep_hardirqs_on+0xbf/0x140
<6> [427.708611]  do_syscall_64+0x37/0x90
<6> [427.708671]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
<6> [427.708718] RIP: 0033:0x7fb515da15ce
<6> [427.708757] RSP: 002b:00007ffddb59aba0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8
<6> [427.708822] RAX: ffffffffffffffda RBX: 0000557ac3d75570 RCX: 00007fb515da15ce
<6> [427.708856] RDX: 0000000000000051 RSI: 0000557ac3ea7dc0 RDI: 0000000000000004
<6> [427.709624] RBP: ffffffffffffffff R08: 0000000000000000 R09: 0000000000000960
<6> [427.709661] R10: 00000000ffffffff R11: 0000000000000293 R12: 0000000000000001
<6> [427.709694] R13: 0000000000000051 R14: 0000557ac24c5883 R15: 0000000000000000