on Thu, May 10, 2001 at 10:54:18PM -0500, Astrogeek (dude@failsure.net) wrote: > On my unstable box, "mount -a" segfaults. It gives the following error (lots > of stuff snipped): An interesting mystery. > <1>Unable to handle kernel NULL pointer dereference at virtual address[...] > [...] > pmd entry cbb49000: 0000000000000000 > ... pmd not present! > [...] > > I woke up this morning and everything was unmounted. I actually found > that kind of odd :-) Windows instincts somehow kicked in and I > rebooted. And mount segfaulted giving me only the NFS mounts, /, > /proc and /dev. I have to manually mount several partitions. dmesg > also segfaults, and I can't see if anything else is going wrong as > (since /var is on a separate partition) I have no kernel log! I've > been messing with it for a couple hours now, I have: > > 1) Installed mount/util-linux from testing and stable and compiled > from source > 2) Downgraded libc6 to testing and back again, no change > 3) Removed and tested each stick of RAM in the machine, and some > add-on cards > 4) Memtest came up with no errors on five runs > 5) Tried different kernel versions (all 2.4.x, running 2.4.4-ac6) > 6) strace mount -a doesn't show anything obvious (to me) except at the end > +++ killed by SIGSEGV +++ You usually need to trace back through the command list a bit -- usually less than a screenful, occasionally more. If you can't work it out yourself, post, say, the last 100 lines of strace output to list. > Mounting each partition individually, as stated above, works for some > reason. How about commenting out all but one partition in /etc/fstab, then adding them back in one at a time, and trying "mount -a" until the problem appears. It's odd though that individual mounts work where a mount -a doesn't. It might also be helpful for you to post your /etc/fstab as this might hold some clues. Partition type / filesystem among them. Have you checked the filesystem(s) for errors? > Before I reinstall, as this is really difficult for me to > troubleshoot, anybody more experienced have any suggestions? Nothing > except mount and dmesg appear to be having trouble. > > The machines running stable are all yawning ;-) I hope it's not bad > hardware. I be broke. I'm leaning toward HW myself, as it seems like you've been through most of the SW systems involved. -- Karsten M. Self <kmself@ix.netcom.com> http://kmself.home.netcom.com/ What part of "Gestalt" don't you understand? There is no K5 cabal http://gestalt-system.sourceforge.net/ http://www.kuro5hin.org
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