I have a core file from a VM.

Crash tool will not read it:

crash /usr/lib/debug/lib/modules/2.6.18-308.el5/vmlinux /opt/crash/vmss.core

crash 7.1.0-3.el6
[SNIP...]
GNU gdb (GDB) 7.6
[SNIP...]
This GDB was configured as "x86_64-unknown-linux-gnu"...
crash: /usr/lib/debug/lib/modules/2.6.18-308.el5/vmlinux and /opt/crash/vmss.core do not match!

It would seem this is incorrect, uname -r on the host shows: 2.6.18-308.el5
This is verified here:

strings /usr/lib/debug/lib/modules/2.6.18-308.el5/vmlinux | grep "Linux version"

Linux version 2.6.18-308.el5 (mockbuild@ca-build10.us.oracle.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Sat Feb 25 12:40:07 EST 2012

strings /opt/crash/vmss.core | grep "Linux version"

Linux version 2.6.18-308.el5 (mockbuild@ca-build10.us.oracle.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Sat Feb 25 12:40:07 EST 2012

These are identical.

Any ideas?