That bug is very similar to one I filed that was closed because dmesg
showed the grep segfault was due to the NVidia drivers.
I can't find the one I reported, I've tried bugzilla parameters that
should imho show me closed bugs in grep, but it says zaro bugs found,
so I'm not searching bugzilla right apparently - because I _know_ it
was there (I filed it), I _know_ it was closed as duplicate of general
nvidia bug, I _know_ that the issue was spinlock, and that dmesg showed
it was nvidia's driver to blame. But I can't find it in bugzilla.
If you know how to search bugzilla better than me, it was reported
against grep from my e-mail address < mpeters mac com >