Spouted to log 8 times a second: segfault at 0 ip 0057f280 sp bfb3c1c8 error 4 in libc-2.11.1.so[509000+14d000]

Binary package hint: zsh

zsh is my default shell. On two different computers, my system log is swamped with lines like the following:

Mar 19 17:26:26 dylan-laptop kernel: [ 6687.000213] zsh[17270]: segfault at 0 ip 00186280 sp bfb0eb28 error 4 in libc-2.11.1.so[110000+14d000]
Mar 19 17:26:26 dylan-laptop kernel: [ 6687.097689] zsh[17272]: segfault at 0 ip 00364280 sp bfdc8bd8 error 4 in libc-2.11.1.so[2ee000+14d000]
Mar 19 17:26:26 dylan-laptop kernel: [ 6687.197424] zsh[17274]: segfault at 0 ip 00556280 sp bfcf0958 error 4 in libc-2.11.1.so[4e0000+14d000]
Mar 19 17:26:26 dylan-laptop kernel: [ 6687.303456] zsh[17276]: segfault at 0 ip 004b2280 sp bf94db18 error 4 in libc-2.11.1.so[43c000+14d000]
Mar 19 17:26:26 dylan-laptop kernel: [ 6687.404276] zsh[17278]: segfault at 0 ip 00186280 sp bfc74b18 error 4 in libc-2.11.1.so[110000+14d000]
Mar 19 17:26:31 dylan-laptop kernel: [ 6691.581587] __ratelimit: 40 callbacks suppressed
Mar 19 17:26:31 dylan-laptop kernel: [ 6691.581591] zsh[17367]: segfault at 0 ip 002ce280 sp bfc8c6a8 error 4 in libc-2.11.1.so[258000+14d000]
Mar 19 17:26:31 dylan-laptop kernel: [ 6691.677477] zsh[17369]: segfault at 0 ip 001c9280 sp bfe417c8 error 4 in libc-2.11.1.so[153000+14d000]
Mar 19 17:26:31 dylan-laptop kernel: [ 6691.774994] zsh[17371]: segfault at 0 ip 00186280 sp bfafeb48 error 4 in libc-2.11.1.so[110000+14d000]

As you can see, they are insanely frequent and I have one of those blocks for every second I am logged in.
Didn't observe this until just now. /var/log takes up 197.7MB at this point. Don't worry, I'm prepared for this one, now, after my WiFi driver swallowed 2GB with logs ;)

Unfortunately, I haven't been able to find a particular pattern other than that it's incredibly frequent, and I'm not experienced dealing with swarms of information like this. If more information is needed, though, I can try.

ProblemType: Bug
Architecture: i386
Date: Fri Mar 19 17:41:55 2010
DistroRelease: Ubuntu 10.04
NonfreeKernelModules: nvidia
Package: zsh 4.3.10-5ubuntu2
ProcEnviron:
 LANG=en_CA.utf8
 SHELL=/bin/zsh
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: zsh
Uname: Linux 2.6.32-16-generic i686