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Re: [patch] allow switching stacks

From: Andrew Cagney <cagney at gnu dot org>
To: jim dot houston at comcast dot net
Cc: gdb-patches at sources dot redhat dot com
Date: Tue, 09 Mar 2004 15:21:25 -0500
Subject: Re: [patch] allow switching stacks
References: <m3y8qbp650.fsf@new.localdomain>

Hi Everyone,

This patch against gdb-6.0 adds an option to disable an error check
which reports a non-contiguous stack as corrupted. I need this
option to get a reliable stack trace using kgdb on the x86-64 Linux
kernel because it uses a separate per-processor interrupt stack.

This option is enabled with:

set backtrace switch-stacks on

Jim Houston - Concurrent Computer Corp.

Can you provide more details of the problem -- exactly what do things look like at the stack switch?

Your problem sounds very similar to the combination of a signal altstack and a signal trampoline - for such a situtation the stack direction check isn't applicable (pointing to the real bug).

Andrew

References:
- [patch] allow switching stacks
  - From: Jim Houston

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