Otherwise, if we assert, we'll hang here:
Thread 1 (Thread 0x7f74eba79580 (LWP 1688617)):
#0 0x00007f74eb2aa529 in futex_wait (private=<optimized out>, expected=132, futex_word=0x7ffd642b4b54) at ../sysdeps/unix/sysv/linux/futex-internal.h:61
#1 futex_wait_simple (private=<optimized out>, expected=132, futex_word=0x7ffd642b4b54) at ../sysdeps/nptl/futex-internal.h:135
#2 __pthread_cond_destroy (cond=0x7ffd642b4b30) at pthread_cond_destroy.c:54
#3 0x0000563ff2e5a891 in LibRadosService_StatusFormat_Test::TestBody (this=<optimized out>) at /usr/include/c++/7/bits/unique_ptr.h:78
#4 0x0000563ff2e9dc3a in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void> (location=0x563ff2ea72e4 "the test body", method=<optimized out>, object=0x563ff422a6d0)
at ./src/googletest/googletest/src/gtest.cc:2605
#5 testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void> (object=object@entry=0x563ff422a6d0, method=<optimized out>, location=location@entry=0x563ff2ea72e4 "the test body")
at ./src/googletest/googletest/src/gtest.cc:2641
#6 0x0000563ff2e908c3 in testing::Test::Run (this=0x563ff422a6d0) at ./src/googletest/googletest/src/gtest.cc:2680
#7 0x0000563ff2e90a25 in testing::TestInfo::Run (this=0x563ff41a3b70) at ./src/googletest/googletest/src/gtest.cc:2858
#8 0x0000563ff2e90ec1 in testing::TestSuite::Run (this=0x563ff41b6230) at ./src/googletest/googletest/src/gtest.cc:3012
#9 0x0000563ff2e92bdc in testing::internal::UnitTestImpl::RunAllTests (this=<optimized out>) at ./src/googletest/googletest/src/gtest.cc:5723
#10 0x0000563ff2e9e14a in testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> (location=0x563ff2ea8728 "auxiliary test code (environments or event listeners)",
method=<optimized out>, object=0x563ff41a2d10) at ./src/googletest/googletest/src/gtest.cc:2605
#11 testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool> (object=0x563ff41a2d10, method=<optimized out>,
location=location@entry=0x563ff2ea8728 "auxiliary test code (environments or event listeners)") at ./src/googletest/googletest/src/gtest.cc:2641
#12 0x0000563ff2e90ae8 in testing::UnitTest::Run (this=0x563ff30c0660 <testing::UnitTest::GetInstance()::instance>) at ./src/googletest/googletest/src/gtest.cc:5306
Signed-off-by: Sage Weil <sage@newdream.net>