FreeBSD version: 11-Current (armv6)
Hardware: Raspberry Pi 2
Problem: When attempting to copy multiple files (or a ditectory tree) from a ZFS volume to a UFS partition, FreeBSD crashes and requires a power cycle.When the OS crashes it is completely unresponsive to either keyboard input or network pings.
I have experimented with multiple devices formatted with ZFS. In each case I can import the ZFS pool, browse direcotires and copy files one at a time from the ZFS volume to a UFS partition. Howver, trying to copy more than three or four files at a time using the "cp" command causes FreeBSD to freeze.
Copying files from the UFS partition to the ZFS partition works, even when dealing with large directory trees. Only ZFS-to-UFS appears to trigger the crash.
Copying large numbers of files within the boundaries of the ZFS volume works. Copying many files within the boundary of the UFS volume also works. The bug is only triggered when copying multiple files from ZFS to UFS.
A discussion on this issue is ongoing in the FreeBSD forum: https://forums.freebsd.org/threads/raspberry-pi-2.50291/page-2