Fix flaky test shutdown race in seqno_time_test #12282
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Summary: Seen in build-macos-cmake: ``` Received signal 11 (Segmentation fault: 11) facebook#1 rocksdb::MockSystemClock::InstallTimedWaitFixCallback()::$_0::operator()(void*) const (in seqno_time_test) (mock_time_env.cc:29) facebook#2 decltype(std::declval<rocksdb::MockSystemClock::InstallTimedWaitFixCallback()::$_0&>()(std::declval<void*>())) std::__1::__invoke[abi:v15006]<rocksdb::MockSystemClock::InstallTimedWaitFixCallback()::$_0&, void*>(rocksdb::MockSystemClock::InstallTimedWait ixCallback()::$_0&, void*&&) (in seqno_time_test) (invoke.h:394) ... ``` This is presumably because the std::function from the lambda only saves a copy of the SeqnoTimeTest* this pointer, which doesn't prevent it from being reclaimed on parallel shutdown. If we instead save a copy of the `std::shared_ptr<MockSystemClock>` in the std::function, this should prevent the crash. (Note that in `SyncPoint::Data::Process()` copies the std::function before releasing the mutex for calling the callback.) Test Plan: watch CI
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@pdillinger has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
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@pdillinger merged this pull request in b31f324. |
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Summary: Seen in build-macos-cmake:
This is presumably because the std::function from the lambda only saves a copy of the SeqnoTimeTest* this pointer, which doesn't prevent it from being reclaimed on parallel shutdown. If we instead save a copy of the
std::shared_ptr<MockSystemClock>in the std::function, this should prevent the crash. (Note that inSyncPoint::Data::Process()copies the std::function before releasing the mutex for calling the callback.)Test Plan: watch CI