[swift-dev] snapshot build hang (TestNSNotificationCenter.test_removeObserver)

[Drew Crawford]

I'm attempting to build the snapshot (swift-DEVELOPMENT-SNAPSHOT-2016-01-25-a) on Linux (running buildbot-linux).

I've gotten as far as the Foundation test suite, but on two different reproductions, the Foundation tests hang in an extremely unusual location.

The exact output is

Test Case 'TestNSJSONSerialization.test_isValidJSONObjectTrue' started.
Test Case 'TestNSJSONSerialization.test_isValidJSONObjectTrue' passed (0.0 seconds).
Test Case 'TestNSJSONSerialization.test_isValidJSONObjectFalse' started.
Test Case 'TestNSJSONSerialization.test_isValidJSONObjectFalse' passed (0.0 seconds).
Executed 23 tests, with 0 failures (0 unexpected) in 0.002 (0.003) seconds
Test Case 'TestNSLocale.test_constants' started.
Test Case 'TestNSLocale.test_constants' passed (0.0 seconds).
Executed 1 test, with 0 failures (0 unexpected) in 0.0 (0.0) seconds
Test Case 'TestNSNotificationCenter.test_defaultCenter' started.
Test Case 'TestNSNotificationCenter.test_defaultCenter' passed (0.0 seconds).
Test Case 'TestNSNotificationCenter.test_postNotification' started.
Test Case 'TestNSNotificationCenter.test_postNotification' passed (0.0 seconds).
Test Case 'TestNSNotificationCenter.test_postNotificationForObject' started.
Test Case 'TestNSNotificationCenter.test_postNotificationForObject' passed (0.0 seconds).
Test Case 'TestNSNotificationCenter.test_postMultipleNotifications' started.
Test Case 'TestNSNotificationCenter.test_postMultipleNotifications' passed (0.0 seconds).
Test Case 'TestNSNotificationCenter.test_addObserverForNilName' started.
Test Case 'TestNSNotificationCenter.test_addObserverForNilName' passed (0.0 seconds).
Test Case 'TestNSNotificationCenter.test_removeObserver' started.
Test Case 'TestNSNotificationCenter.test_remove

Very curious that it seems to halt in the middle of printing a log line.

For background, I'm building on a fresh Debian install inside an xhyve VM on El Capitan.  I'm going to retest this on VirtualBox just on the off-chance that this is somehow a bug in the VM itself.
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