While working with an EPIA M10000 board and ohphone, I got the following error:

Assertion failed! chan->is_active == sg_active(chan->iobase),via82cxxx_audio.c,via_chan_maybe_start,line=1347

By googling around, I found the solution here.

Apparently, this is due to a paranoid ;-) sound driver for the VIA 8233 audio codec chip. Even if the audio DSP stopped unexpectedly, this not a reason to fire an assert!