igt@gem_exec_gttfill@all - fail - Failed assertion: !"GPU hung", IPEHR: 0x6b6b6b6b

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_475/fi-tgl-u/igt@gem_exec_gttfill@all.html

Starting subtest: all
(gem_exec_gttfill:4970) igt_aux-CRITICAL: Test assertion failure function sig_abort, file ../lib/igt_aux.c:501:
(gem_exec_gttfill:4970) igt_aux-CRITICAL: Failed assertion: !"GPU hung"
Subtest all failed.

7> [289.916077] heartbeat [0360] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
<7> [289.916079] heartbeat *
<7> [289.916083] heartbeat 	On hold?: 0
<7> [289.916085] heartbeat 	MMIO base:  0x001c8000
<7> [289.916105] heartbeat 	EL_STAT_HI: 0x40000000
<7> [289.916111] heartbeat 	EL_STAT_LO: 0x48002098
<7> [289.916116] heartbeat 	RING_START: 0x007ff000
<7> [289.916121] heartbeat 	RING_HEAD:  0x00002490
<7> [289.916126] heartbeat 	RING_TAIL:  0x00002490
<7> [289.916134] heartbeat 	RING_CTL:   0x00003001
<7> [289.916142] heartbeat 	RING_MODE:  0x00000000
<7> [289.916147] heartbeat 	RING_IMR:   0x00000000
<7> [289.916152] heartbeat 	RING_ESR:   0x00000000
<7> [289.916157] heartbeat 	RING_EMR:   0xfffffffe
<7> [289.916162] heartbeat 	RING_EIR:   0x00000000
<7> [289.916173] heartbeat 	ACTHD:  0x00000000_00202490
<7> [289.916183] heartbeat 	BBADDR: 0x00000000_2baaa118
<7> [289.916193] heartbeat 	DMA_FADDR: 0x00000000_00801490
<7> [289.916199] heartbeat 	IPEIR: 0x00000000
<7> [289.916204] heartbeat 	IPEHR: 0x6b6b6b6b
<7> [289.916207] heartbeat 	Execlist tasklet queued? no (enabled), preempt? expired, timeslice? inactive