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[Sean Clarke <sean.clarke@xxxxxxxxxxxxxxxxxxxx>]

Sorry Joseph, I should have been clearer. It was with the mainline
kernel 3.12.0-999-generic #201310090426, I never gor around to trying
the rc5 kernel as you suggested - this is my company fileserver so I
cannot just do immediate changes (unless of course it has just crashed
and I am recovering).

I think the lock up problem now is related to bug #1237794 which I am
also looking at, I have not encountered anymore memory issues. so if you
wish you could close this as fixed upstream and I will continue with
#1237794

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https://bugs.launchpad.net/bugs/1238658

Title:
  rsync between two btrfs filesystems causes machines to crash with
  symptoms of memory leak

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Using the latest 13.10 (kernel 3.11.0-12-generic) we performed a
  backup which is essentially an rsync from a 6 disk array to a USB HDD
  - both are BTRFS filesystems

  After several hours the machine was unresponsive and the screen full
  of out of memory errors and killing lots of different processes.

  This was happening at the same time as bug #1237794 - the bugs may be
  related, they may not.

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