On Tue, 2007-11-20 at 11:21 +0100, Tore Anderson wrote: > * S. J. van Harmelen > > > Could you specify the steps I have to take to create the backtrace a > > bit more as I have not done this before. > > > > I run a debian etch server with a custom compiled 2.6.23.1 kernel > > when I get the error. > > Debian strips all their binaries by default, so you need to recompile > multipath-tools and reinstall it: > > $ export DEB_BUILD_OPTIONS=nostrip > $ apt-get build-dep multipath-tools > $ apt-get --compile source multipath-tools > $ dpkg -i multipath-tools*deb I guess I don't have to do that as I compiled the multipath-tools myself? wget http://christophe.varoqui.free.fr/.../multipath-tools-0.4.8.tar.bz2 tar jxf multipath-tools-0.4.8.tar.bz2 cd multipath-tools-0.4.8/ make make install I did compile them when running the 2.6.22.2 kernel though. Should I recompile them when running the 2.6.23.1 kernel, or doesn't that matter? > > Then start multipathd from a shell that has core dumps enabled (make > sure it's not already running): > > $ ulimit -c unlimited > $ multipathd > > Wait for a segfault to happen, and you should have gotten a file named > "core" in your current directory (or maybe in the root directory since > multipathd chdir()s there, I'm not sure) that contains the backtrace. > We need to extract it with GDB, though, so run: > > $ gdb /sbin/multipathd /path/to/core > (gdb) bt full Oke, the segfault happens right at the start (and only at the start), so that shouldn't be a problem. But I have to stop the running mulipathd and that seems like a problem. This machine is running in production :) So that will have to wait until I get a maintance window I guess... > > ...and post the resulting backtrace here. Hopefully a developer (not > me, unfortunately) will be able to make sense of it. > > Another thing you might want to try is to use your 2.6.23.1 with the > same configuration as your 2.6.22.x (ie. don't use hwhandler rdac), and > see if the segfaults still occur. > > Regards -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
