Date: Wed, 21 Jul 2010 06:16:10 GMT From: Mike Andrews <mandrews@bit0.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/148807: 8.1-RELEASE "panic: sbdrop" and "panic: sbsndptr: sockbuf _ and mbuf _ clashing" under heavy load Message-ID: <201007210616.o6L6GAjS006772@www.freebsd.org> Resent-Message-ID: <201007210620.o6L6K1GN081710@freefall.freebsd.org>
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>Number: 148807 >Category: kern >Synopsis: 8.1-RELEASE "panic: sbdrop" and "panic: sbsndptr: sockbuf _ and mbuf _ clashing" under heavy load >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jul 21 06:20:01 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Mike Andrews >Release: 8.1-RELEASE amd64 >Organization: >Environment: FreeBSD bourbon.fark.com 8.1-RELEASE FreeBSD 8.1-RELEASE #6: Sat Jul 17 18:30:12 EDT 2010 root@beer.int.fark.com:/usr/obj/usr/src/sys/FARK64 amd64 >Description: Under heavy load (i.e. enough to make an 8 GB machine start to swap) I'm seeing multiple (identical) machines panic repeatedly with the above panic messages. The panics go away once load goes down. Also very occasionally seeing "em0: discard frame w/o packet header" before the panics, though not very often. Hardware is five identical Supermicro PDSMI+ systems, Q6600, 8 GB ECC memory. The only references I'm finding to these panics on Google seem to point at either IPv6 or em as potential issues, and we're using both. :) Specifically http://groups.google.com/group/mailing.freebsd.net/browse_thread/thread/28db45413a889411 looks VERY similar. I have not yet tried shutting off IPv6 or at least switching some services back to IPv4. (Our v6 usage is all internal-only.) core.txt.* files are at http://www.bit0.com/tmp/core.txt.20100721.tar.gz I have minidumps as well but as they may contain some proprietary data I'd rather not post 'em online, however I can run whatever kgdb commands are needed to help troubleshoot. :) >How-To-Repeat: See above >Fix: Unknown >Release-Note: >Audit-Trail: >Unformatted:
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