Am I not supposed to be able to run crash on a 64-bit host, on a vmcore generated on a 32-bit host? This core was generated on a 32-bit RHEL5: $ file vmcore-2007-11-26-04-08-14 vmcore-2007-11-26-04-08-14: ELF 64-bit LSB core file Intel 80386, version 1 (SYSV), SVR4-style And on my 64-bit RHEL5 I get: $ crash /usr/lib/debug/lib/modules/2.6.18-8.1.6.el5PAE/vmlinux vmcore-2007-11-26-04-08-14 crash 4.0-4.6.1 <snip> crash: vmcore-2007-11-26-04-08-14: not a supported file format And the vmlinux I'm pointing at is the right 32-bit one: $ rpm -qf /usr/lib/debug/lib/modules/2.6.18-8.1.6.el5PAE/vmlinux --queryformat '%{arch}\n' i686 -jf