[Bug 195970] virtualbox/memory allocator problem: "dd: stdout: Cannot allocate memory"

[bugzilla-noreply at freebsd.org]

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

Martin Birgmeier <la5lbtyi at aon.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|dd: stdout: Cannot allocate |virtualbox/memory allocator
                   |memory                      |problem: "dd: stdout:
                   |                            |Cannot allocate memory"
            Version|10.1-RELEASE                |10.2-RELEASE

--- Comment #1 from Martin Birgmeier <la5lbtyi at aon.at> ---
In 10.2, the same behavior still persists. The symptom is that when VirtualBox
is running, a dd from a disk partition does not run to completion, but aborts
with the error messsage "dd: cannot allocate memory".

So, the scenario is:
- I want to low-level copy a disk partition using dd
- At the same time, a VirtualBox instance is running

Expected result:
- dd runs to completion
- VirtualBox does not affect dd

Actual result:
- As long as VirtualBox is running, dd aborts after a random number of blocks
read

Workaround:
- Do not start VirtualBox while dd is running

Is this some interaction in how the kernel allocates buffers? It surely isn't
really a userspace problem?

-- Martin

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