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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/1237794

Title:
  hard lockup on filserver

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi,
      My Core i7 18TB BTRFS file server has been upgraded to 13.10 and since doing so locks up frequently.  Previously it never crashed and was only taken down for maintenance, Monday we upgraded to 13.10 and since then it locks up ever 20hrs or so. We were doing a large backup last night and it locked up within 6 or so hrs.

  On the 1st occurrence absolutely nothing was in the logs, on the 2nd
  occurrence there was some NFS hang messages, when system comes back up
  I will check and post any logging information gleaned.

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