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gdb, cores & kg switchtoact

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gdb, cores & kg switchtoact

Subject: gdb, cores & kg switchtoact
From: Brian Bergstrand <email@hidden>
Date: Thu, 25 Aug 2005 11:21:04 -0500

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I'm investigating a kernel core and trying to use kgmacros' switchtoact. It keeps failing with a memory error though.

(gdb) switchtoact <ADDRESS>
Cannot access memory at address

Looking at the macro I see:

set (struct savearea *) kdp.saved_state=$newact->machine->pcb

So the macro is trying to change memory and failing to do so. A manual set gives the same error:

(gdb) set (struct savearea *)kdp.saved_state=0
Cannot access memory at address 0x3d1cec

This must be because the core is not real memory, but a read-only snapshot.

So, is there anyway around this? I need to inspect different act stacks.

Thanks.

P.S. I seem to remember this working under 10.3.x, but I could be wrong.

Brian Bergstrand
<http://www.bergstrand.org/brian/>   PGP Key ID: 0xB6C7B6A2

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