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Date: Thu, 22 Sep 2005 00:36:09 -0600
From: Scott Long <scottl@samsco.org>
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To: "Mikhail T." <mi@aldan.algebra.com>
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Cc: amd64@FreeBSD.org, re@FreeBSD.org, current@FreeBSD.org
Subject: Re: amd64+gdb -- instant reboot (BETA5 and 4)
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Mikhail T. wrote:
> Hi!
> 
> I was trying to use gdb to debug a program (audio/timidity++) on
> my 6.0-BETA4.
> 
> It would play fine, and then I'll interrupt it with Ctrl-C to enter the
> debugger. If I then try to exit the debugger, the whole system will
> reboot instantaniously.
> 
> I sync-ed to today's sources (BETA5) and added WITNESS, WITNESS_KDB,
> INVARIANTS, and INVARIANT_SUPPORT (strangly, INVARIANTS requires, but
> does not imply INVARIANT_SUPPORT).
> 
> With BETA5 the story is exactly the same -- instant reboot.
> 
> Sometimes I can see two lines of debug messages (lock order reversal?)
> flushed on the console, but the machine reboots too quickly to read
> them beyond:
> 
> 	1 ....................
> 	2 ....................
> 
> Is this gdb misbehaviour a known problem? How can I have the system
> avoid rebooting? Crash-dumping is enabled, but does not take place :-(
> 
> Is that because timidity uses threads, perhaps?
> 
> Thanks!
> 
> 	-mi

It's definitely not known.  Any chance you could hook up a serial
console to log the output.  It'll be pretty hard to debug otherwise.
Sounds like you're likely getting a triple fault.

Scott