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To: Bakul Shah <bakul@BitBlocks.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sat, 11 Jun 2005 08:46:29 PDT."
	<200506111546.j5BFkToq011515@gate.bitblocks.com> 
Date: Mon, 13 Jun 2005 10:16:10 +0200
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Sender: phk@critter.freebsd.dk
Cc: Antoine Brodin <antoine.brodin@laposte.net>, freebsd-arch@freebsd.org
Subject: Re: RFC: Stack saving/tracing functionality. 
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In message <200506111546.j5BFkToq011515@gate.bitblocks.com>, Bakul Shah writes:
>> ... but it would be neat if it could also save/print userland stacks
>> so that we could get tracebacks from abort()'ing userland programs.
>
>Along these lines; wouldn't it be neat if there was a sysctl
>to leave a segfaulted or aborted process around so that you
>can attach a debugger to it and find out what went wrong (and
>may be even correct it!)?  Debugging a live process (even if
>fatally injured) yields more clues as you can poke around at
>its I/O connections, its caller process etc.  A separate
>program can be used to create a coredump if you really wish
>to preseve the dead body for later autopsy.

Ideally a coredump should include anything sockstat and fstat can
tell you about the process.

/me longs for the MVS dumps level of details...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.