ZFS/extattr lockup (was Re: bsdtar lockup on Current-03/10/2009)

[John Nielsen]

On Wednesday 11 March 2009 12:35:37 am Tim Kientzle wrote:
> John Nielsen wrote:
> > I today noticed the same problem on -CURRENT i386 built March 9.
> > ...  using ZFS and initially
> > thought that was the source of the regression but I haven't produced
> > the lockup with anything but tar and the extattr removal hack seems
> > to have fixed it for now ...
>
> The common element so far seems to be ZFS.  Can you verify that
>
>    $ lsextattr -h user <filename>
>
> hangs on your system as well?  That invokes the same
> extattr_list_link system call used by tar to enumerate
> the extended attributes on a file.

Confirmed. I ran the command on a file in /root (UFS) with no problem. 
Running again on a file in /home/john (ZFS) caused the hang.

JN