[Bug 200415] System crashes when copying multiple files from ZFS to UFS

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200415

            Bug ID: 200415
           Summary: System crashes when copying multiple files from ZFS to
                    UFS
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: jsmith at resonatingmedia.com

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

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