Hi,

It would appear that we have a sporadic issue with the new condvar implementation. A completely unrelated PR failed on master due to the Thread_CondvarNotifyWakeup test failing during the test run on an Android device.

test_thread.cpp:712: CHECK_EQUAL(wait_counter, num_waiters-1) failed with (7, 9)

A subsequent run of the same build didn't fail. @kspangsege indicated that trying to reproduce this issue on Linux might be tricky because there might be implementation differences between the two platforms.

Console (not much information): https://ci.realm.io/job/core-android-run-tests/63/console
Test results: https://ci.realm.io/job/core-android-run-tests/63/testReport/junit/%28root%29/DefaultSuite/Thread_CondvarNotifyWakeup/