crash in xfs in current

[Daniel Wagner]

> Thanks for testing this to both of you.  Can you try to build a kernel
> from git commit 555b67e4e729ca544bb4028ab12e532c68b70ddb - this is the
> XFS pull request that Dave sent to Linux for Linux 4.7-rc, so it has
> all the XFS changes relative to 4.6, but none of the others like the VFS
> changes.

For some reason, I can't reproduce it with 4.7-rc1 right now. still
trying...