Date: Sun, 30 Nov 2003 10:10:58 +0100 From: Stefan Ehmann <shoesoft@gmx.net> To: Don Lewis <truckman@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: panic on 5.2 BETA: blockable sleep lock Message-ID: <1070183457.1099.2.camel@shoeserv.freebsd> In-Reply-To: <200311280002.hAS029eF016292@gw.catspoiler.org> References: <200311280002.hAS029eF016292@gw.catspoiler.org>
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On Fri, 2003-11-28 at 01:02, Don Lewis wrote: > On 27 Nov, Stefan Ehmann wrote: > > On Wed, 2003-11-26 at 08:33, Don Lewis wrote: > >> The problem is that selrecord() wants to lock a MTX_DEF mutex, which can > >> cause a context switch if the mutex is already locked by another thread. > >> This is contrary to what bktr_poll() wants to accomplish by calling > >> critical_enter(). > > > > Strange enough that does not seem to happen with a kernel built without > > INVARIANTS and WITNESS. Does this make any sense or is this just by > > chance? > > You might try the patch below with WITNESS enabled. I don't have the > hardware, so I can't test it. It compiles for me, but for all I know it > could delete all your files if you run it. Any chance for getting this committed?
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