Trying to reproduce with the above command line I don't see the above failure mode. I do see an "Invalid write". I won't file a separate bug until we've investigated further:

Repeating all tests (iteration 12) . . .

Note: Google Test filter = ClientSurfaceEvents.client_can_query_current_orientation
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from ClientSurfaceEvents
[ RUN      ] ClientSurfaceEvents.client_can_query_current_orientation
/home/alan/display_server/mir1/tests/acceptance-tests/test_client_surface_events.cpp:254: Failure
Value of: wait_for_event(mir_event_type_orientation, std::chrono::seconds(1))
  Actual: false
Expected: true
==3769== Invalid write of size 4
==3769==    at 0x77D288: testing::UnitTest::AddTestPartResult(testing::TestPartResult::Type, char const*, int, std::string const&, std::string const&) (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x77212C: testing::internal::AssertHelper::operator=(testing::Message const&) const (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x601A77: ClientSurfaceEvents_client_can_query_current_orientation_Test::TestBody() (test_client_surface_events.cpp:254)
==3769==    by 0x794335: void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x78F58B: void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x7772E2: testing::Test::Run() (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x777ABD: testing::TestInfo::Run() (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x77814D: testing::TestCase::Run() (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x77E797: testing::internal::UnitTestImpl::RunAllTests() (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x795713: bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x7903E5: bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==    by 0x77D456: testing::UnitTest::Run() (in /home/alan/display_server/mir1/build/bin/mir_acceptance_tests)
==3769==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==3769== 
==3769== 
==3769== HEAP SUMMARY:
==3769==     in use at exit: 296,994 bytes in 4,389 blocks
==3769==   total heap usage: 154,055 allocs, 149,666 frees, 8,123,620 bytes allocated
==3769== 
==3769== LEAK SUMMARY:
==3769==    definitely lost: 0 bytes in 0 blocks
==3769==    indirectly lost: 0 bytes in 0 blocks
==3769==      possibly lost: 51,235 bytes in 934 blocks
==3769==    still reachable: 245,759 bytes in 3,455 blocks
==3769==         suppressed: 0 bytes in 0 blocks
==3769== Rerun with --leak-check=full to see details of leaked memory
==3769== 
==3769== For counts of detected and suppressed errors, rerun with: -v
==3769== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Killed