[Bug 112042] [CI][BAT] igt at i915_selftest@live_gem_contexts - dmesg-fail - igt_shared_ctx_exec failed with error -5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112042

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
The basic pattern is like

<7> [659.573044] hangcheck rcs0
<7> [659.573066] hangcheck      Awake? 6
<7> [659.573070] hangcheck      Hangcheck: 5954 ms ago
<7> [659.573074] hangcheck      Reset count: 0 (global 0)
<7> [659.573077] hangcheck      Requests:
<7> [659.573084] hangcheck      MMIO base:  0x00002000
<7> [659.573879] hangcheck      RING_START: 0x001d0000
<7> [659.573886] hangcheck      RING_HEAD:  0x00000028
<7> [659.573893] hangcheck      RING_TAIL:  0x00000068
<7> [659.573903] hangcheck      RING_CTL:   0x00003001
<7> [659.573925] hangcheck      RING_MODE:  0x00000000
<7> [659.574685] hangcheck      RING_IMR: 00000000
<7> [659.574700] hangcheck      ACTHD:  0x00000000_001773e4
<7> [659.574714] hangcheck      BBADDR: 0x00000000_001773e5
<7> [659.574755] hangcheck      DMA_FADDR: 0x00000000_001775c0
<7> [659.574762] hangcheck      IPEIR: 0x00000000
<7> [659.574770] hangcheck      IPEHR: 0xf77d32ef
<7> [659.575542] hangcheck      Execlist status: 0x00202098 00000020, entries
12
<7> [659.575548] hangcheck      Execlist CSB read 2, write 2, tasklet queued?
no (enabled)
<7> [659.575561] hangcheck              Active[0]: ring:{start:001d4000,
hwsp:fae192c0, seqno:00000000}, rq:  20fd7:2  prio=3 @ 7541ms: [i915]
<7> [659.575567] hangcheck              Active[1]: rq:  20fd6:4!+  prio=2 @
7541ms: signaled
<7> [659.575734] hangcheck              E  20fd7:2  prio=3 @ 7541ms: [i915]
<7> [659.575814] hangcheck              Queue priority hint: 3
<7> [659.575820] hangcheck              Q  20fd8:2  prio=3 @ 7540ms: [i915]
<7> [659.575826] hangcheck              Q  20fd9:2  prio=3 @ 7540ms: [i915]
<7> [659.575832] hangcheck              Q  20fda:2  prio=3 @ 7540ms: [i915]
<7> [659.575838] hangcheck              Q  20fdb:2  prio=3 @ 7538ms: [i915]
<7> [659.575844] hangcheck              Q  20fd7:4-  prio=2 @ 7541ms: [i915]
<7> [659.575850] hangcheck              Q  20fd8:4  prio=2 @ 7540ms: [i915]
<7> [659.575855] hangcheck              Q  20fd9:4  prio=2 @ 7540ms: [i915]
<7> [659.575861] hangcheck              ...skipping 2 queued requests...
<7> [659.575867] hangcheck              Q  20fdc:2  prio=2 @ 7538ms: [i915]
<7> [659.575897] hangcheck HWSP:
<7> [659.575905] hangcheck [0000] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [659.575909] hangcheck *
<7> [659.575915] hangcheck [0040] 10008002 00000000 10008002 00000000 10008002
00000020 10000014 00000060
<7> [659.575921] hangcheck [0060] 10000018 00000000 10000001 00000000 10000018
00000020 10000001 00000000
<7> [659.575926] hangcheck [0080] 10008002 00000040 10000014 00000040 10008002
00000060 10000014 00000060
<7> [659.575931] hangcheck [00a0] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000002
<7> [659.575937] hangcheck [00c0] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [659.575941] hangcheck *
<7> [659.575946] hangcheck Idle? no

The GPU is not executing the same context as is active, and the HEAD is off in
nowhere land. Naturally it dies.

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