Follow-up Comment #16, bug#64806 (group make): >From the backtrace of the hung process, it looks like we wait forever for a mutex to be released, which means some child process that holds the mutex exited. But the mutex is never released. Do you see any other related sub-processes that are hung at that time? Since Make is run with "-j 8", there could be up to 8 Make sub-processes running for which we are waiting in the top-level Make.
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