[Crash-utility] Re: BISECTED: Re: source line numbers with x86_64 modules?

Dave Anderson <anderson(a)redhat.com&gt; writes: > Actually it's not a problem with the vmlinux file, but rather with kernel > module object files. The crash utility has an embedded gdb module which > is invoked as "gdb vmlinux", and to get line numbers, the crash utility > simply uses the relevant built-in gdb function to get them. And line > numbers work fine with the base kernel code from the vmlinux file. > > The debuginfo data of kernel modules can be subsequently added to the > crash session by doing a gdb "add-symbol-file" command for any or all > kernel modules. But getting correct line number information for kernel > modules has been a crap-shoot in the past, depending upon architecture > and/or kernel version. For example, they don't work with 2.6.9-based > RHEL4 x86_64 kernel modules, but work fine with 2.6.18-based RHEL5 x86_64 > kernels. > > Looking at Mike's suspect kernel patch list, I don't see anything that > would have any relationship to the issue. Perhaps there was a build tool > change during the same timeframe? It look like Mike just built a series of kernels and had a problem, which should preclude a tool change. That said. Does this feature of crash work in 2.6.29? If not is there enough interest to track this down, and fix it if it is a kernel bug? If we are going to be using these tools we need them working on the latest and greatest kernels, not some weird enterprise branch, for fuddy duddies.