[Bug 1393825] [NEW] Juju testsuite fails in random ways

[Martin Packman]

Public bug reported:

Two parts of the juju-core test suite panic or segfault when run with
-compiler gccgo on amd64.

Some examples, in provider/openstack:

ubuntu at 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 at 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 at 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:

$ (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>

** Affects: gccgo-go (Ubuntu)
     Importance: Undecided
         Status: New

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

Title:
  Juju testsuite fails in random ways

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