Red Hat Bugzilla – Bug 476373
Latest crash in F9 does not support the latest 2.6.27 F9 kernel
Last modified: 2009-06-10 08:25:13 EDT
Description of problem:
The current version of the crash utility, in F9, does not appear to support crash dumps from the latest available F9 2.6.27 kernel.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install latest crash and F9 kernel build, 184.108.40.206-53.fc9.x86_64. Install the corresponding debuginfo rpm, etc...
2. Install kexec-tools, set it up, etc..
3. Generate a succesful crash dump via altsysrq
4. Try to start crash: crash [vmlinux path] [vmcore path]
crash: cannot resolve: "end_pfn"
A useful debug session
The following thread suggests that this is a known issue in the version of crash not supporting the 2.6.27 kernel. This thread appears to include the necessary patch:
> The following thread suggests that this is a known issue in the version of
> crash not supporting the 2.6.27 kernel. This thread appears to include the
> necessary patch:
That's correct -- which resulted in this upstream change in 4.0-7.2:
4.0-7.2 - Fix for initialization-time failure when running against 2.6.27
x86_64 kernels, which indicate "crash: cannot resolve: end_pfn".
The patch sets the new 2.6.27 x86_64 PAGE_OFFSET value, handles
the change in the x86_64 "_cpu_pda" variable declaration, and
distinguishes paravirtual "pv_ops" kernels from traditional xen
kernels. (firstname.lastname@example.org, email@example.com)
> Version-Release number of selected component (if applicable):
I don't update existing Fedora versions of crash given that they
constantly update their kernel versions, so it's a losing battle.
Every so often I update the "devel" branch, and the most recent one
is later than the one you reference:
But now that one is also obsolete. When I get around to it, I'll update
the devel branch to the latest (at the time) version.
In any case, as I tell all Fedora users, just download the latest from:
Actually I did try rebuilding the latest crash from the F10 branch. I did try to rebuild 4.0-7, but that version still failed to read the crash file. 4.0-7 is dated July 15th, while that mailing list message is from September.
Rebuilding your 4.0-7.5 snapshot resulted in success opening the same kernel dump. So, it looks like F10's crash indeed requires an update.
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