zfsonlinux/zfs — pull request #655 by gentoofan (2012-04-09 17:08:49+00:00)
Title: Illumos #1680: zfs vdev_file_io_start: validate vdev before using vdev_tsd

This fix has been applied to FreeBSD and is pending review by Illumos.

I have not duplicated the issue that the FreeBSD developers observed, but I am confident that this change is safe, even if it does not address a problem in our code.