----- "Bhaskar Jayaraman" <Bhaskar.Jayaraman@xxxxxxx> wrote: > Dave, my apologies for being ambiguous, I forgot to mention how I > installed xen-3.3.0; since an upgrade of the xen kernel, which came > with the CentOS 5.2 DVD, to xen-3.3.0 would fail the xen python > scripts, a workaround was employed. > So we first install CentOS w/o Xen and then bring in the xen-3.3.0 > sources and install it on top of this. In this procedure the crash.ko > driver doesn't seem to be getting installed. > Now I'm facing two issues: - > > 1] I believe I will need the crash.ko driver to run the crash on a > live kernel but I'm not able to find its source file in the linux > sources that come with 3.3.0 As I've tried to stress in my previous responses, the Red Hat crash.ko module is most likely *not* necessary in your case -- but more on that below... With respect to the ramifications of applying xen-3.3.0 source code (which includes Xensource's 2.6.18-based kernel, right?) on top of the CentOS 5.2 source three, then it's to be expected that Xensource vmlinux kernel doesn't include the /dev/crash driver -- that's a Red Hat only concept. > > 2] I believe we have to build a debug kernel for crash to work with > it. However when I enable the compile kernel with debug info in "make > menuconfig", and make in the /xen-3.3.0/linux-2.6.18-xen.hg directory > and do a make on /xen-3.3.0 directory, I keep getting an error which > says: - > Sorry, I'm not going to be able to help you w/respect to upstream Xensource kernel building. Never done it, and I don't suppose I ever will... However, there are several upstream xen junkies on this list, and they may be able to help you out with generating a debug-full vmlinux. > make -C /home/user/xen-3.3.0/linux-2.6.18-xen.hg > O=/home/user/xen-3.3.0/build-linux-2.6.18-xen_x86_64 modules > Using /home/user/xen-3.3.0/linux-2.6.18-xen.hg as source for kernel > /home/user/xen-3.3.0/linux-2.6.18-xen.hg is not clean, please run > 'make mrproper' > in the '/home/user/xen-3.3.0/linux-2.6.18-xen.hg' directory. > make[5]: *** [prepare3] Error 1 > make[4]: *** [modules] Error 2 > make[3]: *** [modules] Error 2 > make[3]: Leaving directory > `/home/user/xen-3.3.0/build-linux-2.6.18-xen_x86_64' > make[2]: *** [build] Error 1 > make[2]: Leaving directory `/home/user/xen-3.3.0' > make[1]: *** [linux-2.6-xen-install] Error 2 > make[1]: Leaving directory `/home/user/xen-3.3.0' > make: *** [install-kernels] Error 1 BTW, did you do the preliminary "make mrproper" like it requests? Anyway, getting back to the /dev/crash driver issue... Especially given that you are running on an x86_64, the course of least resistance is to utilize the built-in /dev/mem driver and forget about trying to shoe-horn the Red Hat /dev/crash driver into place. If /dev/mem doesn't work by default because the Xensource 2.6.18 vmlinux kernel has put restrictions on its use (like Red Hat does), then just remove those restrictions and rebuild. Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
