This is not a bug in libvirt after all.  When I fix migration.c to
reetry on -EAGAIN as well as -EINTR when flushing a buffer, the
migration completes.  However, the resulting VM on the other end is
corrupt.  I can ssh in, but eventually ls of any data not yet in the
buffer cache results in IO error, and eventual crash.

The code which I had to patch has been removed in latest upstream git
HEAD, investigating that...

** Also affects: qemu (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu)
       Status: New => Triaged

** Changed in: qemu (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1157626

Title:
  Unable to use "virsh migrate" on two hosts after moving to raring

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