Re: [RFC] [Crash-utility] Patch to use gdb's bt in crash - works great with kgdb! - KGDB in Linus Kernel.

On Wed, 30 Aug 2006 14:41:32 -0700 Piet Delaney wrote:

On Wed, 2006-08-30 at 16:40 -0400, Vivek Goyal wrote:
On Wed, Aug 30, 2006 at 12:35:21PM -0700, Piet Delaney wrote:

Simple question -- and to be quite honest with you -- I don't
understand why you wouldn't want to simply use gdb alone
in this case?

I don't see any reason for core file not to be read correctly by
gdb. It's convenient to use gdb directly sometimes, for example
while using the ddd GUI.


You can run gdb to open core files as of today but the debugging
capability will be limited. For ex. kernel core headers have the info
of linearly mapped region only and they don't contain the virt address
info of non-linearly mapped regions. So one can not debug the non-linearly
mapped regions like modules.

Amit's modified gdb might help for that problem. I haven't used
it but it allows gdb to load debug information about modules. You
can also use a script Amit wrote to explicitly load module info
into stock gdb; that also might work with kernel core files.


kgdb isn't having any problems with kernel threads back traces.
The kernel objects are tweaked with dwarf code, but I see no
problem with using the same paradigm with crash. Works great.


Can you give some more details on what do you mean by kernel objects
are tweaked with dwarf code.

Attached is the cfi_annotations.patch patch from the kgdb-2.6.16 patch
which is part of the kgdb patch series. I believe George Anzinger used
a similar dwarf patch in the 2.6 mm series patches that Andrew provided.
I think Tom Rini wrote both of them.

ENOPATCH

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