[Bug 108591] [CI][DRMTIP] igt@gem_tiled_fence_blits@normal - fail - Failed assertion: linear[i] == start_val

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=108591

--- Comment #8 from Chris Wilson <chris@chris-wilson.co.uk> ---
Probably should have mentioned the gpu hang, as that makes it a completely
different bug.

<7> [99.123649] hangcheck rcs0
<7> [99.123667] hangcheck \x09current seqno 1ec, last 1fb, hangcheck 1ec [5952
ms]
<7> [99.123671] hangcheck \x09Reset count: 0 (global 0)
<7> [99.123676] hangcheck \x09Requests:
<7> [99.123688] hangcheck \x09\x09first  1ed [4:2ba8] @ 7677ms: rcs0
<7> [99.123693] hangcheck \x09\x09last   1fb [4:2bb6] @ 7672ms: rcs0
<7> [99.123704] hangcheck \x09\x09active 1ed [4:2ba8] @ 7677ms: rcs0
<7> [99.123709] hangcheck \x09\x09ring->start:  0x00002000
<7> [99.123712] hangcheck \x09\x09ring->head:   0x0000ad60
<7> [99.123716] hangcheck \x09\x09ring->tail:   0x0000afc8
<7> [99.123720] hangcheck \x09\x09ring->emit:   0x0000afc8
<7> [99.123724] hangcheck \x09\x09ring->space:  0x00006a78
<7> [99.123729] hangcheck [head ad70, postfix ad88, tail ad98, batch
0x00000000_00326000]:
<7> [99.123745] hangcheck [0000] 02000001 00000000 18800080 00326001 02000000
00000000 10800001 000000c0
<7> [99.123750] hangcheck [0020] 000001ed 01000000
<7> [99.123769] hangcheck \x09RING_START: 0x00002000
<7> [99.123774] hangcheck \x09RING_HEAD:  0x0000ad84
<7> [99.123778] hangcheck \x09RING_TAIL:  0x0000afc8
<7> [99.123782] hangcheck \x09RING_CTL:   0x0001f001
<7> [99.123786] hangcheck \x09RING_MODE:  0x00000000
<7> [99.123791] hangcheck \x09ACTHD:  0x00000000_0060ad84
<7> [99.123795] hangcheck \x09BBADDR: 0x00000000_00000000
<7> [99.123799] hangcheck \x09DMA_FADDR: 0x00000000_0000cfc8
<7> [99.123803] hangcheck \x09IPEIR: 0x00000000
<7> [99.123807] hangcheck \x09IPEHR: 0x02000000
<7> [99.123833] hangcheck \x09\x09E 1ed [4:2ba8] @ 7677ms: rcs0
<7> [99.123870] hangcheck \x09\x09E 1ee [4:2ba9] @ 7676ms: rcs0
<7> [99.123874] hangcheck \x09\x09E 1ef [4:2baa] @ 7676ms: rcs0
<7> [99.123879] hangcheck \x09\x09E 1f0 [4:2bab] @ 7675ms: rcs0
<7> [99.123884] hangcheck \x09\x09E 1f1 [4:2bac] @ 7675ms: rcs0
<7> [99.123888] hangcheck \x09\x09E 1f2 [4:2bad] @ 7675ms: rcs0
<7> [99.123893] hangcheck \x09\x09E 1f3 [4:2bae] @ 7675ms: rcs0
<7> [99.123897] hangcheck \x09\x09...skipping 7 executing requests...
<7> [99.123902] hangcheck \x09\x09E 1fb [4:2bb6] @ 7672ms: rcs0
<7> [99.123905] hangcheck \x09\x09Queue priority: -2147483648
<7> [99.123926] hangcheck \x09gem_tiled_fence [1040] waiting for 1ed
<7> [99.123955] hangcheck IRQ? 0x1 (breadcrumbs? yes)
<7> [99.123959] hangcheck HWSP:
<7> [99.123965] hangcheck [0000] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [99.123968] hangcheck *
<7> [99.123974] hangcheck [00c0] 000001ec 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [99.123979] hangcheck [00e0] 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<7> [99.123983] hangcheck *
<7> [99.123987] hangcheck Idle? no

Looks intact. So could be a reloc coherency issue and it tried to read/write
into garbage, but then it just uses the stale locations of old buffers. Still
that's my leading candidate.

Fwiw, my slow pIIIm i915gm doesn't seem to suffer the same fate.

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