[Bug 1256246] [NEW] gccgo/arm64: using channels before main starts is unreliable

[Michael Hudson-Doyle]

Public bug reported:

This is the distilled version of the problem that was causing the gcc
testsuite to hang -- compile and run the attached.  It hangs for me, but
only on real hardware: I suspect a race that only occurs on
multiprocessors.

For extra fun, it _does not_ hang when compiled with mainline / gcc-4.9
as of a few days ago.

** Affects: gcc-4.8 (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "whut4.go"
   https://bugs.launchpad.net/bugs/1256246/+attachment/3919613/+files/whut4.go

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https://bugs.launchpad.net/bugs/1256246

Title:
  gccgo/arm64: using channels before main starts is unreliable

Status in “gcc-4.8” package in Ubuntu:
  New

Bug description:
  This is the distilled version of the problem that was causing the gcc
  testsuite to hang -- compile and run the attached.  It hangs for me,
  but only on real hardware: I suspect a race that only occurs on
  multiprocessors.

  For extra fun, it _does not_ hang when compiled with mainline /
  gcc-4.9 as of a few days ago.

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