[Bug 111598] [CI][SHARDS] igt at gem_sync@basic-all - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111598

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
<7> [2140.194405] hangcheck rcs0
<7> [2140.194409] hangcheck     Awake? 1
<7> [2140.194411] hangcheck     Hangcheck: 12032 ms ago
<7> [2140.194413] hangcheck     Reset count: 0 (global 49)
<7> [2140.194414] hangcheck     Requests:
<7> [2140.194417] hangcheck     MMIO base:  0x00002000
<7> [2140.194420] hangcheck     CCID: 0x7fff610d
<7> [2140.194423] hangcheck     RING_START: 0x00001000
<7> [2140.194425] hangcheck     RING_HEAD:  0x00001350
<7> [2140.194428] hangcheck     RING_TAIL:  0x00000638
<7> [2140.194432] hangcheck     RING_CTL:   0x00003001
<7> [2140.194435] hangcheck     RING_MODE:  0x00004040
<7> [2140.194438] hangcheck     RING_IMR: fffffffe
<7> [2140.194440] hangcheck     ACTHD:  0x00000000_fa101a00
<7> [2140.194443] hangcheck     BBADDR: 0x00000000_fa104879
<7> [2140.194446] hangcheck     DMA_FADDR: 0x00000000_fa107400
<7> [2140.194448] hangcheck     IPEIR: 0x00000000
<7> [2140.194451] hangcheck     IPEHR: 0x0042001e
<7> [2140.194455] hangcheck             E  3:1e3294-  prio=2147483647 @
13752ms: [i915]
<7> [2140.194457] hangcheck HWSP:
<7> [2140.194460] hangcheck [0000] 00000001 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [2140.194463] hangcheck [0020] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [2140.194464] hangcheck *
<7> [2140.194466] hangcheck [0100] 001e3292 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [2140.194469] hangcheck [0120] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [2140.194470] hangcheck *
<7> [2140.194475] hangcheck Idle? no
<7> [2140.194477] hangcheck Signals:
<7> [2140.194479] hangcheck     [3:1e3294] @ 13752ms

IPEHR doesn't correspond to anything natural. Looks like another instance where
we have strange behaviour on the ringbuffer overshooting its TAIL?

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