Date: Fri, 06 Jul 2012 15:19:08 +0200 From: "Arno J. Klaassen" <arno@heho.snv.jussieu.fr> To: freebsd-stable@freebsd.org Cc: Rick Macklem <rmacklem@uoguelph.ca> Subject: nfs-bug when server for 9-Stable becomes client as well ? Message-ID: <wpy5mxxc1f.fsf@heho.snv.jussieu.fr>
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Hello,
looks like I discouvered a probable bug in the nfs-code, very
easy to reproduce in my setup :
Machine-1 : Today's 9-stable, exporting /files (ufs) and /z2 (zfs)
Machine-2 : 8-stable as of April the 10th exporting /raid1
On Machine-1 I mount /raid1 (rw,nfsv3,intr,tcp,rsize=32768,wsize=32768)
and start a script on this mount looping something like :
dd if=/dev/random of=BIG bs=1048576 count=${SIZE}
cp -fp BIG BIG2
cmp -x BIG BIG2
I let this run for 24 hours (from time to time stressing Machine-1 with
other scripts, including provoking heavy swapping), no problem at all.
However, then I mount /z2 (rw,nfsv3,intr,tcp,rsize=32768,wsize=32768)
on Machine-2, and *immediately* the above loop on Machine-1 fails :
Copying file ...cp: BIG: Permission denied
No console messages this time, last time I got
kernel: nfs_getpages: error 13
kernel: vm_fault: pager read error, pid 87803 (cmp)
on Machine-1.
I repeated this scenario by replacing Machine-2 with a good old
6-4-stable one, same outcome.
Please tell me what I could do to nail this down a bit more.
Thanx in advance,
Best, Arno
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