[Bug 1317358] Re: qemu: race condition on stdin reading

[Launchpad Bug Tracker]

** Branch linked: lp:debian/autopkgtest

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https://bugs.launchpad.net/bugs/1317358

Title:
  qemu: race condition on stdin reading

Status in “autopkgtest” package in Ubuntu:
  Fix Committed

Bug description:
  When copying files back and forth, adt-virt-qemu sometimes fails with

  adt-run: @@@@@@@@@@@@@@@@@@@@ ubtree ubtree0
  tar: Unexpected EOF in archive
  tar: Unexpected EOF in archive
  tar: Error is not recoverable: exiting now

  
  Quick workaround for current users: In virt-subproc/adt-virt-qemu, bump this:

  # give the stdin reading some head start
  time.sleep(0.1)

  to 0.5 or even 1. That'll make the whole thing noticeably slower
  though, but (mostly) avoid the tar error.

  For fixing this for good the "runcmd" needs to be fixed to present the
  copied data from the host as an actual pipe instead of a plain file.

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