Date: Mon, 16 Feb 2004 08:07:00 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Kris Kennaway <kris@obsecurity.org> Cc: current@freebsd.org Subject: Re: Scheduling deadlock on alpha? Message-ID: <20040216070659.GA44313@cicely12.cicely.de> In-Reply-To: <20040216063651.GA72959@xor.obsecurity.org> References: <20040216055840.GA72555@xor.obsecurity.org> <20040216061821.GZ44313@cicely12.cicely.de> <20040216063651.GA72959@xor.obsecurity.org>
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On Sun, Feb 15, 2004 at 10:36:51PM -0800, Kris Kennaway wrote: > On Mon, Feb 16, 2004 at 07:18:22AM +0100, Bernd Walter wrote: > > On Sun, Feb 15, 2004 at 09:58:40PM -0800, Kris Kennaway wrote: > > > One of the alpha package machines seems to have deadlocked; no > > > processes are running, but the kernel itself responds to pings, and I > > > can break to DDB: > > > > How long have you waited? > > It seems that the system was busy waiting for page faults and swap. > > I've seen conditions lately where this can block the system for a very > > long time in case there is not enough memory free. > > The number of processes point to memory stress. > > It's been about 1/2 hour now...this machine doesn't seem to have been > under exceptional load compared to the other equivalent alpha package > machines OK - it was not _that_ long, but it was long enough for me to to really think about a hanging machine once. I'm no VM expert, but those two look very strange to me: 7 fffffc0003ca4b40 fffffe0004f38000 0 0 0 0000204 [SLP]VMWait 0xfffffc000068c468] pagedaemon 0 fffffc0000693178 fffffc0000796000 0 0 0 0000200 [SLP]vmwait 0xfffffc00006e4028] swapper At least I think that all others are awaiting them to do their job first. Not to mention about the different writing of the same word. -- B.Walter BWCT http://www.bwct.de ticso@bwct.de info@bwct.de
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