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Date:      Wed, 14 Mar 2001 20:05:18 -0500 (EST)
From:      Andrew Gallatin <gallatin@cs.duke.edu>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        alpha@FreeBSD.org
Subject:   Re: Deadlocks, whee!
Message-ID:  <15024.5454.615759.779564@grasshopper.cs.duke.edu>
In-Reply-To: <XFMail.010314164809.jhb@FreeBSD.org>
References:  <15024.3948.98001.417245@grasshopper.cs.duke.edu> <XFMail.010314164809.jhb@FreeBSD.org>

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John Baldwin writes:
 > 
 > On 15-Mar-01 Andrew Gallatin wrote:
 > > 
 > > John Baldwin writes:
 > >  > Hi all,
 > >  > 
 > >  > I managed to deadlock my alpha yesterday with a -j 4 buildworld. 
 > > Previously it
 > >  > would die when it trapped with a raised IPL as a blockable mtx_lock() of
 > > lockmgr
 > >  > in trap().  I'm not sure if these two things are related or not.  I'll try
 > > a
 > >  > normal world without -j X today to see if it fairs better.  Just FYI for
 > > those
 > >  > running current that heavy load may deadlock right now. :(
 > > 
 > > The machine is really deadlocked, or just one process is wedged and
 > > the buildworld stalled?
 > 
 > Well, no messages on the console, no ddb (I have vidconsole), no pings, etc. 
 > So interrupts aren't getting through, or if they are their threads aren't
 > running, and since I use preemption on this alpha, that is very, very unlikely.
 > I'm assuming it is genuinely deadlocked or possibly spinning somewhere with a
 > raised IPL.

Do you have a halt button?  If so, what does the console tell you your
PC and RA are?

Drew



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