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Here, the wakePend variable is written to without a lock:
https://github.com/xrootd/xrootd/blob/master/src/XrdSys/XrdSysIOEventsPollE.icc#L210
while here, it's read with a lock:
https://github.com/xrootd/xrootd/blob/master/src/XrdSys/XrdSysIOEvents.cc#L1162
This causes undefined behavior according to the C++11 standard and is illegal.
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