[Bug 108535] [CI][BAT] igt@* - dmesg-fail / incomplete - GEM_BUG_ON(buf[2 * head + 1] != port->context_id)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108535

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
If you look at an example like:
<0>[   44.057849] gem_ctx_-1065    2.... 44089852us : i915_request_add: rcs0
fence 20ff:80
<0>[   44.057881] gem_ctx_-1065    2..s1 44089865us :
execlists_submission_tasklet: rcs0 awake?=1, active=5
<0>[   44.057915] gem_ctx_-1065    2d.s2 44089866us : process_csb: rcs0 cs-irq
head=1, tail=2
<0>[   44.057948] gem_ctx_-1065    2d.s2 44089866us : process_csb: rcs0 csb[2]:
status=0x10000014:0x000002a0, active=0x5
<0>[   44.057982] gem_ctx_-1065    2d.s2 44089867us : process_csb: rcs0 out[0]:
ctx=672.1, global=3670 (fence 20e1:58) (current 3670), prio=0
<0>[   44.058017] gem_ctx_-1065    2d.s2 44089867us : process_csb: rcs0
completed ctx=672
<0>[   44.058051] gem_ctx_-1065    2d.s2 44089868us : __i915_request_submit:
rcs0 fence 20e3:58 -> global=3672, current 3670
<0>[   44.058086] gem_ctx_-1065    2d.s2 44089870us :
__execlists_submission_tasklet: rcs0 in[1]:  ctx=736.1, global=3672 (fence
20e3:58) (current 3671), prio=0
<0>[   44.058123] gem_ctx_-1065    2d.s2 44089871us :
__execlists_submission_tasklet: rcs0 in[0]:  ctx=704.2, global=3671 (fence
20e2:58) (current 3671), prio=0
<0>[   44.058159] gem_ctx_-1065    2..s1 44089886us :
execlists_submission_tasklet: rcs0 awake?=1, active=1
<0>[   44.058192] gem_ctx_-1065    2d.s2 44089887us : process_csb: rcs0 cs-irq
head=2, tail=4
<0>[   44.058224] gem_ctx_-1065    2d.s2 44089888us : process_csb: rcs0 csb[3]:
status=0x10000018:0x000002c0, active=0x1
<0>[   44.058258] gem_ctx_-1065    2d.s2 44089889us : process_csb: rcs0 out[0]:
ctx=704.2, global=3671 (fence 20e2:58) (current 3671), prio=0
<0>[   44.058292] gem_ctx_-1065    2d.s2 44089890us : process_csb: rcs0 csb[4]:
status=0x10000001:0x00000000, active=0x1
<0>[   44.058328] gem_ctx_-1065    2.... 44089895us : i915_request_retire: rcs0
fence 2100:57, global=3637, current 3670
<0>[   44.058363] gem_ctx_-1065    2.... 44089896us : i915_request_retire:
__retire_engine_request(rcs0) fence 2100:57, global=3637, current 3671
<0>[   44.058398] gem_ctx_-1065    2..s. 44089901us :
execlists_submission_tasklet: rcs0 awake?=1, active=5
<0>[   44.058430] gem_ctx_-1065    2d.s1 44089902us : process_csb: rcs0 cs-irq
head=4, tail=4
<0>[   44.058462] gem_ctx_-1065    2.... 44089915us : i915_request_add: rcs0
fence 2100:80
<0>[   44.058494] gem_ctx_-1065    2.... 44089930us : i915_request_retire: rcs0
fence 2101:57, global=3638, current 3671
<0>[   44.058528] gem_ctx_-1065    2.... 44089931us : i915_request_retire:
__retire_engine_request(rcs0) fence 2101:57, global=3638, current 3671
<0>[   44.058563] gem_ctx_-1065    2.... 44089941us : i915_request_add: rcs0
fence 2101:80
<0>[   44.058595] gem_ctx_-1065    2..s1 44089948us :
execlists_submission_tasklet: rcs0 awake?=1, active=5
<0>[   44.058627] gem_ctx_-1065    2d.s2 44089949us : process_csb: rcs0 cs-irq
head=4, tail=5
<0>[   44.058659] gem_ctx_-1065    2d.s2 44089949us : process_csb: rcs0 csb[5]:
status=0x10000014:0x000002c0, active=0x5
<0>[   44.058692] gem_ctx_-1065    2d.s2 44089950us : process_csb: rcs0 out[0]:
ctx=704.1, global=3671 (fence 20e2:58) (current 3672), prio=0
<0>[   44.058727] gem_ctx_-1065    2d.s2 44089950us : process_csb: rcs0
completed ctx=704
<0>[   44.058759] gem_ctx_-1065    2d.s2 44089951us : __i915_request_submit:
rcs0 fence 20e4:58 -> global=3673, current 3672
<0>[   44.058793] gem_ctx_-1065    2d.s2 44089953us :
__execlists_submission_tasklet: rcs0 in[1]:  ctx=768.1, global=3673 (fence
20e4:58) (current 3672), prio=0
<0>[   44.058830] gem_ctx_-1065    2d.s2 44089954us :
__execlists_submission_tasklet: rcs0 in[0]:  ctx=736.2, global=3672 (fence
20e3:58) (current 3672), prio=0
<0>[   44.058865] gem_ctx_-1065    2..s1 44089961us :
execlists_submission_tasklet: rcs0 awake?=1, active=1
<0>[   44.058897] gem_ctx_-1065    2d.s2 44089962us : process_csb: rcs0 cs-irq
head=5, tail=1
<0>[   44.058928] gem_ctx_-1065    2d.s2 44089963us : process_csb: rcs0 csb[0]:
status=0x10000018:0x000002e0, active=0x1
<0>[   44.058962] gem_ctx_-1065    2d.s2 44089963us : process_csb: rcs0 out[0]:
ctx=736.2, global=3672 (fence 20e3:58) (current 3672), prio=0
<0>[   44.058996] gem_ctx_-1065    2d.s2 44089964us : process_csb: rcs0 csb[1]:
status=0x10000001:0x00000000, active=0x1
<0>[   44.059031] gem_ctx_-1065    2.... 44089972us : i915_request_retire: rcs0
fence 2102:57, global=3639, current 3672
<0>[   44.059065] gem_ctx_-1065    2.... 44089973us : i915_request_retire:
__retire_engine_request(rcs0) fence 2102:57, global=3639, current 3672
<0>[   44.059100] gem_ctx_-1065    2..s1 44089980us :
execlists_submission_tasklet: rcs0 awake?=1, active=5
<0>[   44.059133] gem_ctx_-1065    2d.s2 44089983us : process_csb: rcs0 cs-irq
head=1, tail=2
<0>[   44.059164] gem_ctx_-1065    2d.s2 44089983us : process_csb: rcs0 csb[2]:
status=0x10000014:0x000002a0, active=0x5
<0>[   44.059197] gem_ctx_-1065    2d.s2 44089984us : process_csb: rcs0 out[0]:
ctx=736.1, global=3672 (fence 20e3:58) (current 3672), prio=0
<0>[   44.059232] gem_ctx_-1065    2d.s2 44090144us : process_csb:
process_csb:953 GEM_BUG_ON(buf[2 * head + 1] != port->context_id)

Quite clearly we did not receive a CS event for the last submission.

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