igt@testdisplay - timeout - Per-test timeout exceeded. Killing the current test with SIGQUIT.

https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_7640/shard-kbl1/igt@testdisplay.html

<7> [547.169210] i915 0000:00:02.0: [drm:drm_dp_read_downstream_info [drm_display_helper]] AUX B/DDI B/PHY B: DPCD DFP: 0b f0 03 11
<4> [551.182203] [IGT] Per-test timeout exceeded. Killing the current test with SIGQUIT.
<6> [551.182417] sysrq: Show State
<6> [551.182453] task:systemd         state:S stack:12088 pid:    1 ppid:     0 flags:0x00000000
<6> [551.182492] Call Trace:
<6> [551.182503]  <TASK>
<6> [551.182537]  __schedule+0x483/0xb40
<6> [551.182609]  schedule+0x3f/0xb0
<6> [551.182633]  schedule_hrtimeout_range_clock+0x11d/0x130
<6> [551.182654]  ? do_epoll_wait+0x759/0x910
<6> [551.182685]  ? _raw_write_unlock_irq+0x1f/0x50
<6> [551.182710]  ? lockdep_hardirqs_on+0xbf/0x140
<6> [551.182742]  do_epoll_wait+0x76a/0x910
<6> [551.182966]  ? finish_swait+0x90/0x90
<6> [551.183040]  __x64_sys_epoll_wait+0x50/0x90
<6> [551.183066]  ? lockdep_hardirqs_on+0xbf/0x140
<6> [551.183119]  do_syscall_64+0x37/0x90
<6> [551.183152]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
<6> [551.183178] RIP: 0033:0x7f82607595ce
<6> [551.183200] RSP: 002b:00007ffed725b890 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8
<6> [551.183236] RAX: ffffffffffffffda RBX: 000055719fb1bf50 RCX: 00007f82607595ce
<6> [551.183258] RDX: 0000000000000052 RSI: 000055719fc51230 RDI: 0000000000000004
<6> [551.183277] RBP: ffffffffffffffff R08: 0000000000000000 R09: 0000000000001dd0
<6> [551.183296] R10: 00000000ffffffff R11: 0000000000000293 R12: 0000000000000001
<6> [551.183314] R13: 0000000000000052 R14: 000055719e901883 R15: 0000000000000000
<6> [551.183448]  </TASK>