** Description changed:

  Two parts of the juju-core test suite panic or segfault when run with
  -compiler gccgo on amd64.
  
  Some examples, in provider/openstack:
  
  ubuntu@go:~/go/src/github.com/juju/juju$ (cd provider/openstack/&& go test 
./... -compiler gccgo -gocheck.v -v)
  3
  === RUN Test
  ...
  PASS: local_test.go:1207: 
com_juju_juju_provider_openstack_test.TestFetchFromToolsMetadataSources.pN66_github.com_juju_juju_provider_openstack_test.localHTTPSServerSuite
     0.243s
  munmap of stack space failed: errno 22
  Aborted
  ...
  
  ubuntu@go:~/go/src/github.com/juju/juju$ (cd provider/openstack/&& go test 
./... -compiler gccgo -gocheck.v -v)
  3
  === RUN Test
  ...
  PASS: local_test.go:1207: 
com_juju_juju_provider_openstack_test.TestFetchFromToolsMetadataSources.pN66_github.com_juju_juju_provider_openstack_test.localHTTPSServerSuite
     0.295s
  signal: segmentation fault (core dumped)
  FAIL  github.com/juju/juju/provider/openstack 12.746s
  
  And in environs/simplestreams:
  
  ubuntu@go:~/go/src/github.com/juju/juju$ (cd environs/simplestreams&& go test 
./... -compiler gccgo -gocheck.v -v)
  === RUN Test
  ...
  PASS: datasource_test.go:79: 
com_juju_juju_environs_simplestreams_test.TestNonVerifyingClientSucceeds.pN69_github.com_juju_juju_environs_simplestreams_test.datasourceHTTPSSuite
      0.014s
  unexpected fault address 0x7f3300000011
  fatal error: fault
  [signal 0xb code=0x1 addr=0x7f3300000011]
  ...
  
- This one looks a bit like bug 1381671 but the same run can just pass:
+ This one looks a bit like bug 1287879 but the same run can just pass:
  
  $ (cd environs/simplestreams&& go test ./... -compiler gccgo -gocheck.v -v)
  === RUN Test
  ...
  OK: 46 passed
  --- PASS: Test (0.27 seconds)
  PASS
  
- 
  Some investigations from IRC:
  <http://irclogs.ubuntu.com/2014/10/31/%23juju-dev.html#t17:29>

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https://bugs.launchpad.net/bugs/1393825

Title:
  Juju testsuite fails in random ways

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