Segfaults on apt-get update

[Jesse Sheidlower <jester@panix.com>]

I'm running Sid. At some point in the last few days, I lost
the ability to update my packages; Synaptic, which I normally
use, crashes silently (even when run from the commandline),
and "apt-get update" segfaults midway through downloading
packages.

I Googled around for similar problems, and I tried a few
suggestions, including deleting /var/cache/apt/*.bin and
increasing the cache size with 

apt-get -o APT::Cache-Limit="50000000" update

or the like. None of these has been successful.

Any suggestions for what I should try next?

Thanks.

Jesse Sheidlower