freebsd stable - Nov 2009 - zfs/nfs mkstemp() failure & subsequent hangs

Hi all,

I have a 8.0-PRERELEASE zfs/nfs server here that complains about i/o
errors when using rsync on a nfs client:

rsync: mkstemp
"/usr/portage/metadata/cache/app-mobilephone/.ksms-0.1.2.4.BynVFw"
failed:
Input/output error (5)


I found this to be quite similar to kern/135412. However, this one
is said to be fixed and only applicable to 7-stable anyway.
Furthermore, after this happened, I tried to access files on the server
from the zfs filesystem concerned and found that I cannot access the fs
anymore. ls hangs in state zfs, so do mountd and zfs unmount.

Questions:
Should I open a new PR for this?
Are there any ideas how to recover access to the fs apart from rebooting
the machine? Right now I still have it running, so I could get some more
debugging information out of it.


cu
  Gerrit

On Fri, 20 Nov 2009, Gerrit Kühn wrote:
> Hi all,
>
> I have a 8.0-PRERELEASE zfs/nfs server here that complains about i/o
> errors when using rsync on a nfs client:
>
> rsync: mkstemp
>
"/usr/portage/metadata/cache/app-mobilephone/.ksms-0.1.2.4.BynVFw"
failed:
> Input/output error (5)
>
>
> I found this to be quite similar to kern/135412. However, this one
> is said to be fixed and only applicable to 7-stable anyway.
> Furthermore, after this happened, I tried to access files on the server
> from the zfs filesystem concerned and found that I cannot access the fs
> anymore. ls hangs in state zfs, so do mountd and zfs unmount.
>
> Questions:
> Should I open a new PR for this?
Gerrit reports that the fix recently committed to FreeBSD-current as
r199616 (and will be MFC'd to stable/8 in about 2 weeks unless problems
with it are reported) has fixed this problem.

Thanks to Gerrit for reporting it and testing the fix, rick