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Date:      06 Feb 2003 17:13:32 -0500
From:      Muhannad Asfour <muhannad07@cogeco.ca>
To:        Peter Kostouros <peter.kostouros@awta.com.au>
Cc:        freebsd-questions@freebsd.org, freebsd-current@freebsd.org
Subject:   RE: Server locking hard -- A LOT!!!
Message-ID:  <1044569611.39439.2.camel@bsdbox.qubix.ca>
In-Reply-To: <13103B46A474B64E97C5A932AFF1E99B01B744@ho.awtaltd.local>
References:  <13103B46A474B64E97C5A932AFF1E99B01B744@ho.awtaltd.local>

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On Wed, 2003-02-05 at 21:03, Peter Kostouros wrote:
> Hi
> 
> I experienced the problem with kernels from last weekend. I rebuilt
> yesterday, but have not undergone high loads since. I will do thorough tests
> over the weekend.
> 
> Keep in mind there have been some complaints recently, and there is new
> scheduler code just implemented, so I guess at that at the moment CURRENT is
> a place for the brave, well, braver than most.
> 
> -----Original Message-----
> From: Muhannad Asfour [mailto:muhannad07@cogeco.ca]
> Sent: Thursday, 6 February 2003 12:40 PM
> To: Peter Kostouros
> Cc: FreeBSD-current@FreeBSD.org; FreeBSD-questions@FreeBSD.org
> Subject: RE: Server locking hard -- A LOT!!!
> 
> 
> On Wed, 2003-02-05 at 20:03, Peter Kostouros wrote:
> > Not sure this is much help, but I have been getting many hard locks too,
> > from about a kernel I built around the 27th January. My symptoms are that
> > under a relatively heavy CPU load, upon invoking or terminating an
> > application, the machine occasionally terminates (abruptly). I do not even
> > get core dumps.
> > 
> > -----Original Message-----
> > From: Muhannad Asfour [mailto:muhannad07@cogeco.ca]
> > Sent: Thursday, 6 February 2003 11:27 AM
> > To: Peter Kostouros
> > Cc: FreeBSD-questions@FreeBSD.org; FreeBSD-current@FreeBSD.org
> > Subject: Re: Server locking hard -- A LOT!!!
> > 
> > 
> > On Wed, 2003-02-05 at 19:23, Peter Kostouros wrote:
> > > Hi Muhannad
> > > 
> > > Your dmesg output had the following:
> > > lock order reversal 1st 0xc2b5d230 process lock (process lock) @
> > > ../../../kern/kern_descrip.c:2104 
> > > 2nd 0xc2b5bd34 filedesc structure (filedesc structure) @
> > > ../../../kern/kern_descrip.c:2111 
> > > 
> > > These are indicative of the lock order reversals appearing recently. Do
> > you
> > > always get these?
> > > 
> > > Regards
> > >  
> > > Peter
> > > 
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> > 
> > Yes, I always get these.
> I am experiencing the same exact thing.  Odd.  Any idea if it still
> occurs with a more recently built kernel?

I've felt like I tried everything so far, and I cannot figure out what
the problem is, I've done numerous hardware tests, and every single one
was passed with flying colours.  I have narrowed it down to apache
locking the box though.  So I'm not sure what I can do to fix this,
because it is very tedious to have to keep manually rebooting the box
everytime it locks (sometimes 3 times a day!)

Can anyone please suggest something to fix this issue?  If any of the
developers read this, I can give you ssh to the box if required so you
can see what's happening.

Thanks


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