(In reply to Jiri Slaby from comment #18) > (In reply to Jiri Slaby from comment #17) > > So it can and does open .xz. Tony, do you have some old version of systemtap? > > Stap seems to use libelf to handle that and this was added there by > commit 6ecdead8c0fbba51e8b2561e4d54dd7be3f69204 > Author: Roland McGrath <roland@redhat.com> > Date: Fri Feb 11 12:29:45 2011 -0800 > > libdwfl: Search for Linux kernel binaries with compression file name > suffixes. > > So xz should not be a problem. That said, I don't understand what your issue > is. Something seems to be broken on your system. I don't have an issue. The vmlinux I was using wasn't xz compressed and so systemtap wasn't decompressing it. Maybe it can decompress xz. My point was that you said only "kdump and crash read it [vmlinux]" which isn't true, systemtap also does. That is all.