A few of us are experiencing problems with alsa-libs-1.0.2. Example:
charlie@mightymax testcase $ solarwolf
python: pcm_rate.c:512: snd_pcm_rate_init: Assertion `0' failed.
The problem is detailed well in this message:
The incredibly simple patch is in the follow-up reply:
Steps to Reproduce:
According to this message:
it was fixed in a new release of 1.0.2 (same file name, updated contents). The digest for the file in portage matches the latest from the website, and I visually confirmed that the fix is in it.
Just delete /usr/portage/distfiles/alsa-lib-1.0.2.tar.bz2 and re-emerge.