The following reply was made to PR kern/162558; it has been noted by GNATS.
From: Eugene Grosbein <[email protected]> To: [email protected] Cc: Subject: Re: kern/162558: [dummynet] [panic] seldom dummynet panics Date: Wed, 15 Feb 2012 19:25:43 +0700 Hi! The source of this problem seems to be famous 'dangling pointer' problem: - mbufs with packets from PPPoE users sometimes stall within dummynet queues, - then user disconnects, its ngX interface get destroyed, - then dummynet attempts to dereference its ifp pointer and panic occurs. There is workaround consisting of several tunnables eliminating races: - net.isr.bindthreads=1 in /boot/loader.conf; - net.isr.direct=1 and net.isr.direct_force=1 in /etc/sysctl.conf (default) Plus, use recent 8.2-STABLE as it contains some netgraph fixes for bugs that lead to panics in 8.2-RELEASE and early 8.2-STABLE versions. With these precautions I run my routers rock stable for months. Eugene Grosbein _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[email protected]"
