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Date:      Wed, 30 Jun 2004 10:05:15 +0200
From:      Daniel Lang <dl@leo.org>
To:        Colin Percival <colin.percival@wadham.ox.ac.uk>
Cc:        freebsd-current@freebsd.org
Subject:   Re: sio vs sched_lock LOR (was: Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain")
Message-ID:  <20040630080515.GE79266@atrbg11.informatik.tu-muenchen.de>
In-Reply-To: <6.1.0.6.1.20040629223609.03bdfce0@popserver.sfu.ca>
References:  <20040628202434.GA73213@atrbg11.informatik.tu-muenchen.de> <20040629153921.GE75577@atrbg11.informatik.tu-muenchen.de> <6.1.0.6.1.20040629223609.03bdfce0@popserver.sfu.ca>
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[-- Attachment #1 --]
Hi,

Colin Percival wrote on Tue, Jun 29, 2004 at 10:58:29PM -0700:
[..]
> Regardless of the questionable validity of the other problems this machine
> is encountering, this LOR is real (and ugly).  calcru() asserts that it is
> holding sched_lock, but it can printf() about negative runtime or runtime
> going backwards.  With a serial console attached, these messages end up at
> siocnputc(), which needs sio_lock.

Yes, I get lots of 'calcru' messages on the console.

> Now, I presume that there is some reason why the locking order hard-coded
> into witness makes it illegal to pick up sio_lock while holding sched_lock,
> but I can't see it.  Maybe someone else can explain?
> 
> In the mean time, a workaround for this LOR is to unplug the serial console. :-)

ARGL :-)

Well, if this keeps the machine from locking up, I'll try it...

Best regards,
 Daniel
-- 
IRCnet: Mr-Spock  
   - In dieser Mail ist ein Geist, der Dich in den Hintern beisst - 
 Daniel Lang * dl@leo.org * +49 89 289 18532 * http://www.leo.org/~dl/

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