[Bug 195970] New: dd: stdout: Cannot allocate memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195970

            Bug ID: 195970
           Summary: dd: stdout: Cannot allocate memory
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: la5lbtyi at aon.at

Scenario:
  - amd64 machine acting as a VirtualBox host; virtualbox-ose-4.3.20_2 is
installed
  - while a VirtualBox client is running, the command

    dd if=/dev/ada0s1 bs=1m

    is run, issued via rsh from a remote computer (the purpose is to save a
copy of partition ada0s1 to the remote computer)

Result:
  - after some time, dd exits with an error:

    dd: stdout: Cannot allocate memory
    33006+0 records in
    33005+0 records out
    4326031360 bytes transferred in 69.111410 secs (62595038 bytes/sec)

Expected result:
  - dd completes until the entire partition ada0s1 has been read

Notes:
  - This did not happen when the machine was running FreeBSD 9.2 (with
virtualbox-ose-4.3.20 installed).
  - After shutting down all VirtualBox clients on the machine, the same dd
command runs to completion (no reboot required).

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