Date: Fri, 1 Jul 2005 14:29:46 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Marc Olzheim <marcolz@stack.nl> Cc: freebsd-stable@FreeBSD.org Subject: Re: Today's RELENG_5_4 and 'lock cmpxchgl' Message-ID: <20050701182946.GA99767@xor.obsecurity.org> In-Reply-To: <20050701130335.GA2040@stack.nl> References: <20050701101458.GA1193@stack.nl> <20050701104139.GB1193@stack.nl> <20050701130335.GA2040@stack.nl>
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[-- Attachment #1 --] On Fri, Jul 01, 2005 at 03:03:35PM +0200, Marc Olzheim wrote: > On Fri, Jul 01, 2005 at 12:41:39PM +0200, Marc Olzheim wrote: > > On Fri, Jul 01, 2005 at 12:14:58PM +0200, Marc Olzheim wrote: > > > Somehow, this sounds familiar, i.e.: the "lock cmpxchgl": > > > > > > Fatal trap 12: page fault while in kernel mode > > ... > > > Stopped at 0xc05160c3 = knote+0x27: lock cmpxchgl %ecx,0x1c(%edx) > > > > Somehow I think I solved this last time by activating 'INVARIANTS'... > > I'll try that now. > > Let's paraphrase: > > I think i solved this last time by activating 'INVARIANTS'... > > Anyway, tried that and yes, it didn't crash in the last few hours, so I > guess it works. Without INVARIANTS, it crashed within seconds. > > On the downside, my Gigabit performance dropped from 99 MB/sec to 80 > MB/sec because of INVARIANTS. The panic appears to be an instance of a known bug in 5.4 (and INVARIANTS will not fix it, but may just delay the inevitable by changing timings). See Doug White's recent emails which point to a patch you should test. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCxYuaWry0BWjoQKURApEDAJ0YmU9ZOekwqYZakNtElz1LYPT32wCfYPYJ Lpy2ECAZlZ0IgAT+DS5XiOs= =gIzy -----END PGP SIGNATURE-----
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