Host dies on NFS write

[Anders <mail-e0wP/LNAh+3kORH8mtz0xlpr/1R2p/CL@public.gmane.org>]

Hi,

I am running 32 bit Linux (Ubuntu Gutsy: 2.6.22-14-server) on host and
guest. Many kvm-intel versions, including kvm-58.

The guest is an NFS server. Whenever I write a large file from the
host, the guest freezes within a few seconds, and the host slowly
spirals into death as well. I am then unable to do most things, but
usually can do ctrl-alt-f1, ctrl-alt-delete to get a proper shutdown
of the host.

There is no Oops or other messages on either host or guest console.

When reading from the NFS, I do not see a problem. Also, a scp write
of the same file completes.

Running strace on the qemu host process shows that it stops in a
write() system call that never returns. The fd is the NFS drive, which
is "-hdb /dev/md1" on the host.

I have tried changing any option that I can think of (including using
all the nic drivers), both in qemu/kvm options and in the guest
kernel, but the problem persists. The only thing that helped was
-no-kvm.

Any pointers on how to debug this further? Thanks!


   Anders

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