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Fix race condition in UDCM #887
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…_event_active == 1` but main thread has already stopped processing messages and thus we will have the situation where one message was left unhandled leading to a hang. (cherry picked from commit open-mpi/ompi@aefc2ed)
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artpol84
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* open-mpi#815 * open-mpi#819 * open-mpi#832 * open-mpi#833 * open-mpi#852 * open-mpi#868 * open-mpi#879 * open-mpi#887 * open-mpi#888 * open-mpi#889 (related to the commit open-mpi/ompi@2abb297)
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where service thread sees that
cm_message_event_active == 1but main thread has already stopped processing messages and thus we will have the situation where one message was left unhandled leading to a hang.(cherry picked from commit open-mpi/ompi@aefc2ed)
Comes from PR open-mpi/ompi#1283