PFZheng edited a comment on issue #1085: PrometheusMetricsService造成死锁 URL: https://github.com/apache/incubator-brpc/issues/1085#issuecomment-613207192 如果是在PassiveStatus里用了 bthread mutex，可能是内部版本fix过的一个问题。这里会有一个pthread mutex 下用 bthread mutex的嵌套。 问题出在这段代码 struct VarMapWithLock : public VarMap { pthread_mutex_t mutex; VarMapWithLock() { CHECK_EQ(0, init(1024, 80)); pthread_mutexattr_t attr; pthread_mutexattr_init(&attr); **pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);** pthread_mutex_init(&mutex, &attr); pthread_mutexattr_destroy(&attr); } }; 这里的pthread mutex可能重入，重入的pthread mutex在lock/unlock的时候会检查owner，即pthread id。bthread切换后，这个条件不再满足，导致锁未unlock。
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