Data race condition

The value of the shared data will be determined by the interleaving of thread execution. Thread shared data is accessed without holding an appropriate lock, possibly causing a race condition
/src/mongo/executor/connection_pool.cpp:274: MISSING_LOCK 142853 Accessing "<anonymous>.cb" without holding lock "mongo::executor::ConnectionPool._mutex". Elsewhere, "auto mongo::executor::ConnectionPool::SpecificPool::guardCallback<mongo::executor::ConnectionPool::SpecificPool::updateEventTimer()::[lambda() (instance 1)]>(mongo::executor::ConnectionPool::SpecificPool::updateEventTimer()::[lambda() (instance 1)] &&)::[lambda(T1 &&...) (instance 1)].cb" is written to with "ConnectionPool._mutex" held 1 out of 1 times.