Date: Sun, 11 Apr 1999 00:03:49 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "David E. Cross" <crossd@cs.rpi.edu> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-security@FreeBSD.ORG Subject: Re: increased crashing in NFS server Message-ID: <199904110703.AAA03493@apollo.backplane.com> References: <199904110341.XAA17071@cs.rpi.edu>
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:I recently updated all of our FreeBSD3 clients to use NFSv3/UDP when
:contacting our servers (FreeBSD3 of the same build tree). We have
:noticed an increase in crashing of our main home directory server
:(which is the only server really handling RW mounts, our other servers
:are mostly RO, with some minor RW activity.) The first crash was
:obviously NFS. I traced it to one of 2 possible crash points in the
:kernel (sorry, no stack trace, we don't [yet] have a crashlogs enabled
:for that machine.).
:
:The panic was:
:mbuf siz=33476
:panic: Bad nfs svc reply
You are using a 32K file block size? If so, reduce it to 8K.
I think you've just shown us a security hole in the NFS system -- it
panics if it is given too large a response packet. Oops. It should
just print a message and drop the packet.
:The second panic just happened, it claims to be softupdate related. I
:think it may have something to do with NFSv3 however since this machine
:used to be very stable (ie, not 2 crashes in a week).
:
:This panic was:
:panic: softdep_write_inodeblock: indirect pointer #0 mismatch 0 != 102192
:8
:syncing disks... panic: softdep_lock: locking against myself
:...
: The Regents of the University of California. All rights reserved.
:FreeBSD 3.1-STABLE #0: Sun Mar 21 02:23:19 EST 1999
: schimken@wobble.cs.rpi.edu:/usr/src/sys/compile/STAGGER
:...
:David Cross | WinNT:Linux::Linux:FreeBSD
This is when you built it. When did you check the source out of the CVS
tree?
There have been a few commits in this area since Mar 21st, you definitely
want to update your sources, but I don't think any of the commits address
the above softupdates panic. I've never seen that panic before.
I recommend fsck'ing all your filesystems from single-user just in case
there's some garbage in there.
-Matt
Matthew Dillon
<dillon@backplane.com>
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