Data corruption over NFS in -current

Martin Cracauer cracauer at
Wed Jan 11 16:57:33 UTC 2012

I'm sorry for the unspecific bug report but I thought a heads-up is
better than none.

$ uname -a
FreeBSD 10.0-CURRENT FreeBSD 10.0-CURRENT #2: Wed Dec
28 12:19:21 EST 2011
cracauer at  amd64

I see filesystem corruption on NFS filesystems here.  I am running a
heavy shellscript that is noodling around with ascii files assembling
them with awk and whatnot.  Some actions are concurrent with up to 21
forks doing full-CPU load scripting.  This machine is a K8 with a
total of 8 cores, diskless NFS and memory filesystem for /tmp.

I observe two problems:
- for no reason whatsoever, some files change from my 
  (user/group) cracauer/wheel to root/cracauer
- the same files will later be corrupted.  The beginning of the file
  is normal but then it has what looks like parts of /usr/ports,
  including our CVS files and binary junk, mostly zeros

I did do some ports building lately but not at the same time that this
problem manifested itself.  I speculate some ports blocks were still
resident in the filesystem buffer cache.

Server is Linux.

Martin Cracauer <cracauer at>

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