Panic on boot with April 16 src (lengthy info attached)

Robert Watson rwatson at
Tue Apr 17 21:05:25 UTC 2007

On Tue, 17 Apr 2007, Tillman Hodgson wrote:

> On Tue, Apr 17, 2007 at 05:32:32PM +0100, Robert Watson wrote:
>> There's quite a bit of stuff in here, but I can speak to this one: Andre's 
>> recent TCP timer change causes TCP to run without Giant when 
>> debug.mpsafenet=0.  This leads to panics with INVARIANTS, and non-MPSAFE 
>> code running without Giant otherwise.
> Thanks Robert, that did indeed let me boot. I appreciate your help :-)
> I originally put it in there to work around a LOR that I was experiencing 
> (based on you mentioning it in an email to current@ Sun 18 Mar 2007 15:50). 
> doesn't show any changes to 
> that particular LOR, do you happen to know if there's any ongoing work on 
> this? I'm very willing to act as a test system.

I chatted with Andre about the panic earlier this afternoon, and it sounds 
like the fix is straight forward.  I would anticipate seeing it committed in 
the near future.

I'll send out an e-mail explaining the above lock order reversal tomorrow 
morning.  I understand that several people have been looking at this, so 
perhaps one of those people will reply talking about it before then. :-)

Robert N M Watson
Computer Laboratory
University of Cambridge

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