igt@i915_selftest@live@gt_heartbeat - abort - GEM_BUG_ON(engine->heartbeat.systole)

https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_115874v1/fi-kbl-soraka/igt@i915_selftest@live@gt_heartbeat.html#dmesg-warnings460

<6> [923.510208] i915: Running intel_heartbeat_live_selftests/live_heartbeat_fast
<5> [923.525980] i915 0000:00:02.0: [drm] rcs0 heartbeat interval adjusted to a non-default value which may cause engine resets to target innocent contexts!
<6> [923.555064] rcs0: Heartbeat delay: 3430us [3296, 4857]
<5> [923.557934] i915 0000:00:02.0: [drm] bcs0 heartbeat interval adjusted to a non-default value which may cause engine resets to target innocent contexts!
<6> [923.586069] bcs0: Heartbeat delay: 4144us [3909, 4392]
<5> [923.588594] i915 0000:00:02.0: [drm] vcs0 heartbeat interval adjusted to a non-default value which may cause engine resets to target innocent contexts!
<3> [923.593338] __live_heartbeat_fast:227 GEM_BUG_ON(engine->heartbeat.systole)
<0> [923.593529] Dumping ftrace buffer:
<0> [923.593631] ---------------------------------
<0> [923.594917] CPU:0 [LOST 84829 EVENTS]
i915_sel-5636      0..... 858322547us : __i915_request_commit: 0000:00:02.0 bcs0: fence 9e9:5987, current 5986 
<0> [923.596093] i915_sel-5636      0d.s2. 858322762us : __i915_request_submit: 0000:00:02.0 bcs0: fence 9e9:5987, current 5986 
<0> [923.597091] i915_sel-5636      0d.s1. 858322784us : execlists_submission_tasklet: 0000:00:02.0 bcs0: context:9e9 schedule-in, ccid:20
<0> [923.598094] i915_sel-5636      0d.s1. 858322797us : trace_ports: 0000:00:02.0 bcs0: submit { ccid:20 9e9:5987* prio 0 }
<0> [923.599074] i915_sel-5636      0..... 858323148us : __engine_unpark: 0000:00:02.0 vcs0: 
<0> [923.600044] i915_sel-5636      0..... 858323169us : __engine_unpark: 0000:00:02.0 vcs0: context:9ea reset { seqno:174e, *hwsp:174e, ring:4e0 }