Comment # 28
on bug 100567
from Roy
Somewhat surprised that this particular report hasn't received any attention from a core dev. Sadly, I'm afraid my response will not be hugely satisfying eiter. The message "fifo: SCHED_ERROR 0a [CTXSW_TIMEOUT]" is not the result of *a bug* and does not point in the direction of one. Rather it is a symptom of a wide variety of potential problems with nouveau, (all of) which result in a hang of the rendering part of the GPU. On itself it doesn't give meaningful information to any developer as to what may be the culprit. It's like measuring a fever, it could be the result of many conditions. Developers would be helped if there was a reliably reproducible situation in which this event can be triggered. If there is a list of steps that can be followed that would result in this message and a hang, that somehow doesn't involve words like "random" or "wait for possibly a few hours", and that can be traced with tools such as APITrace, we could get a step further in analysing what goes wrong. However, it seems unlikely this is the case, especially since we are also aware of multithreading-related issues that make isolating such problems extremely difficult. Unfortunately, post-mortem syslogs and dmesgs are unlikely to add any useful information to this or similar bug reports.
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