Comment 10 for bug 1085342

pulseaudio is the current best known way to reproduce the problem.

AUDIODRIVER=pulseaudio play -n -c1 synth whitenoise band -n 100 20 \
        band -n 50 20 gain +25 fade h 1 864000 1

Fails once or twice every ten attempts within the first few seconds. I was able to make it fail regularly with a strategic breakpoint in the low level pthread code after releasing on the locks (details fade, but clearly it depends on arranging the the kernel to return EAGAIN to the futex call).