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[Anders Kaseorg <andersk@xxxxxxx>]

Yes, because the Launchpad PPA builders are still running a Hardy kernel
(even when building for supported releases)!

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https://bugs.launchpad.net/bugs/1027517

Title:
  fifo: Do not restart open() if it already found a partner

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This race condition is believed to be responsible for a FTBFS of git
  with dash ≥ 0.5.6 (at least on the PPA builders):

  http://git.kernel.org/linus/05d290d66be6ef77a0b962ebecf01911bd984a78
  fifo: Do not restart open() if it already found a partner
  If a parent and child process open the two ends of a fifo, and the child immediately exits, the parent may receive a SIGCHLD before its open() returns.  In that case, we need to make sure that open() will return successfully after the SIGCHLD handler returns, instead of throwing EINTR or being restarted.  Otherwise, the restarted open() would incorrectly wait for a second partner on the other end.

  The patch was merged as v3.5~31, v3.4.6~25, and v3.0.38~17.

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