Date: Thu, 04 Dec 2003 11:59:30 -0500 From: "Brian F. Feldman" <green@freebsd.org> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-current@freebsd.org Subject: Re: LOR (swap_pager.c , uma_core.c) Message-ID: <200312041659.hB4GxUax006276@green.bikeshed.org> In-Reply-To: Message from Kris Kennaway <kris@obsecurity.org> <20031204163551.GA85960@xor.obsecurity.org>
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Kris Kennaway <kris@obsecurity.org> wrote: > On Thu, Dec 04, 2003 at 05:30:30PM +0100, Andy Hilker wrote: > > > > Hi, > > > > one of my servers with SMP crashs every few minutes oder a few hours > > under heavy load (e.g. /usr/ports/math/mprime, mprime -t ) > > With SMP disabled, server runs very stable. > > > > kernel: lock order reversal > > kernel: 1st 0xc2113c60 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1323 > > kernel: 2nd 0xc076ef40 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pager.c:1838 > > kernel: 3rd 0xc1037b58 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:881 > > kernel: Stack backtrace: > > This is a known false positive, reported at least once a day. Remove > WITNESS_DDB from your kernel, or at least remove DDB_UNATTENDED so > your system won't reboot when these harmless WITNESS warnings show up. Here's all of the sysctls you should know about: debug.trace_on_panic debug.debugger_on_panic kern.sync_on_panic machdep.ddb_on_nmi debug.witness_watch debug.witness_ddb debug.witness_trace debug.witness_skipspin If you want to change debug.witness_skipspin, though, that has to be set as a tunable in /boot/loader.conf instead of /etc/sysctl.conf. If you're actually running into real crashes, there's a possibility that this might help: http://www.FreeBSD.org/~jhb/patches/turnstile.patch -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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