Yay, my LVM is broken.
Good news for everyone having LVM problems. I have now succeeded in breaking my LVM setup on my development laptop (looks similar to what Rik is having - segfault in vgscan), so it looks like I will have to fix.
I'm running latest CVS, but with lots of patches, so I don't rule out that I have broken something. All I had done was play with vgexport on a test VG, and then when trying to import it and it was broken. I ran vgscan to detect it again, which went and deleted the entries for my other active VG, and then it broke as well. No rebooting until it works I guess.
Cheers, Andreas
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Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert