Date: Wed, 20 Nov 2002 10:20:36 -0800 From: "Joel M. Baldwin" <qumqats@outel.org> To: Robert Watson <rwatson@FreeBSD.ORG> Cc: current@FreeBSD.ORG Subject: Re: panic: sleeping thread owns a mutex - with debug traceback Message-ID: <2964362.1037787636@[192.168.1.20]> In-Reply-To: <Pine.NEB.3.96L.1021120120103.40737Z-100000@fledge.watson.org> References: <Pine.NEB.3.96L.1021120120103.40737Z-100000@fledge.watson.or g>
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--On Wednesday, November 20, 2002 12:01 PM -0500 Robert Watson <rwatson@FreeBSD.ORG> wrote: > On Wed, 20 Nov 2002, Robert Watson wrote: > >> Hmm. Another thread has decided to sleep while holding an inpcb >> mutex. Any chance this can be reproduced while running WITNESS? If >> so, you should get a panic earlier when the other thread sleeps in >> the first place. The easiest way to do that is if you can reproduce >> the panic with WITNESS. If you can't reproduce the panic, you may >> be able to extract this from your system core using gdb -- you want >> to figure out what the thread owner of the mutex is doing -- in the >> context of the kassert() below, td is the pointer to the thread >> that owns the mutex. I'm not sure how to extract a stack trace from >> that information, unfortunately, perhaps someone can give us >> pointers. (note: td from the priority_propagate() argument is >> shadowed, which is annoying). > > Ack. I mis-read. You want the stack from thread td1 (the mutex > owner), not thread td. The kernel that produced the core dump ALREADY HAS WITNESS and WITNESS_SKIPSPIN! :( I'll try to get more info from kgdb, but I doubt that I'll have much luck since I've never tried using gdb before. If someone else wants to give it a try the core dump is available at <http://outel.org/sleepingcore>; > Robert N M Watson FreeBSD Core Team, TrustedBSD Projects > robert@fledge.watson.org Network Associates Laboratories To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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