kern/148807: 8.1-RELEASE "panic: sbdrop" and "panic: sbsndptr: sockbuf _ and mbuf _ clashing" under heavy load

Mike Andrews mandrews at bit0.com
Wed Jul 21 06:20:01 UTC 2010


>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 at 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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