zfs/nfs mkstemp() failure & subsequent hangs

[Rick Macklem]

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