[Nouveau] [Bug 99068] Screen hangs when running a 3D app. GTX 660

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99068

--- Comment #7 from Nicolás Luciano Bértolo <nicolasbertolo at gmail.com> ---
What happens is that the file is actually there, but it is 0 bytes long.

This is the script that I am using to extract the files:

#! /bin/bash

rmmod nvidia_drm
rmmod nvidia_modeset
rmmod nvidia

echo 64000 > /sys/kernel/debug/tracing/buffer_size_kb
echo mmiotrace > /sys/kernel/debug/tracing/current_tracer
cat /sys/kernel/debug/tracing/trace_pipe > mmiotrace.log &

modprobe nvidia

xinit -e sh -c "glxgears & sleep 10"

sleep 5
echo nop > /sys/kernel/debug/tracing/current_tracer
wait

This line fails:
echo nop > /sys/kernel/debug/tracing/current_tracer
It outputs: Resource or device busy.

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