hi,
I'm currently doing a pressure test for 3.2.3 using the attached test script. The testing environment is a two nodes replSet using WiredTiger. After running the script for long time(about 2 days). The mongod process will hang. As you can see in the attached thread stack, a lot of threads were waiting for the GlobalLock which was being held by someone(probably the thread doing profile, i.e. Thread 501). Looks like the thread locked it with MODE_IX and was doing a cappedDelete operation, making room for new profiling document. But it seems that it was waiting on WT's cache evict_waiter_cond and hangs there forever.