Date: Wed, 7 Jul 2004 12:24:59 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: Daniel Lang <dl@leo.org> Cc: current@freebsd.org Subject: Re: panic: m_copym, length > size of mbuf chain Message-ID: <Pine.NEB.3.96L.1040707122259.37929D-100000@fledge.watson.org> In-Reply-To: <20040707162154.GB45200@atrbg11.informatik.tu-muenchen.de>
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On Wed, 7 Jul 2004, Daniel Lang wrote: > Dear Robert, > > Robert Watson wrote on Wed, Jul 07, 2004 at 11:11:02AM -0400: > > What kernel configuration are you running with, and what system tunables? > [..] > > Bruce Simpson has asked the same thing. I'll just attach my answer to > him to this mail. > > It does not, however, include the system tunables, and I cannot include > a sysctl -a output right now (the machine just crashed again, this time > again inside of WITNESS, a separate email will document this). But IIRC > I have removed all tunables from /etc/sysctl.conf and /boot/loader.conf > > As I told Bruce, I have never set debug.mpsafenet (in case you are > especially interested in this tunable). Yeah, that's one of the ones I was particularly interested in :-). Just to try ruling out possibilities -- have you run an extensive set of hardware diagnostics? Most server class hardware ships with a decent diagnostics disk, and I'm sure we can find some for you in the event your hardware didn't come with some. While it's quite possibly a software problem, tracking hardware problems using software symptoms constitutes undesirable pain and so it wouldn't hurt to give that a spin. I remember seing your earlier e-mails about running with WITNESS increasing the chances of pain -- this could be a bug in WITNESS as you suggest, or it could be that WITNESS increases the opportunities for a variety of locking related races by increasing the cost of lock/unlock operations. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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