zfs i/o hangs on 9-PRERELEASE

Martin Matuska mm at FreeBSD.org
Mon Nov 28 07:48:34 UTC 2011

On 28.11.2011 3:21, Mark Felder wrote:
> After many hours of testing, reproducing, and testing again I've
> finally been able to narrow down what the real issue is and it's not
> ZFS as I suspected. After completely turning off all NFS functionality
> and serving my files over Samba I haven't had a single issue. It seems
> there is something going on with the new NFS code (I serve out over
> v4, but reproduced it last week with v3) and my media player box, a
> Popcorn Hour A-200 which is running Linux. If I can cobble some
> hardware together and place it between so I can do some tcpdumps I
> will provide that data so perhaps someone can understand what's going
> on. If this is due to a badly behaving client this is potentially a
> DoS on the server.
> Regards,
> Mark
Hi Mark,

as to the output you have posted this seems to be a pf problem. Could
you try the same situation with with pf(4) disabled? If you are not able
to reproduce this hang with pf(4) disabled, it would be very nice to
have a PR submitted.

Martin Matuska
FreeBSD committer

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