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[Sean Clarke <sean.clarke@xxxxxxxxxxxxxxxxxxxx>]

OK, it is reproducible - I have a filserver with 6x 3TB in a BTRFS RAID
1+0 configuration.

>From a client (and using NFS) I copy a 95GB tar file from the fileserver
to a USB HD.

It seems at the very end (when BTRFS deletes the 95GB file on the server
it falls over - btrfs-transaction and btrfs-flush_del using 3 to 5 cores
at 50 to 100%.

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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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