I'm experimenting with recording sound using the Pi and a USB microphone.
I can record long samples using
arecord from the command line but when I use Audacity I get frequent bus errors, usually after 10 seconds or so of recording.
I've changed the sound quality down to 22 KHz to lighten the load on the CPU, but this doesn't seem to affect the crashing.
Here's the log info from kern.log:
Feb 12 13:27:15 raspberrypi kernel: [ 6207.394332] Alignment trap: not handling instruction ece77a01 at [<00393db0>] Feb 12 13:27:15 raspberrypi kernel: [ 6207.394367] Unhandled fault: alignment exception (0x811) at 0xb2805c72