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From Helgrind:
==29093== Locks held: 1, at address 0x200EE9B0
==29093== at 0x650773C9: XrdCl::DefaultEnv::SetLogLevel(std::string const&) (in /afs/cern.ch/cms/sw/ReleaseCandidates/vol0/slc6_amd64_gcc481/external/xrootd/4.0.4/lib/libXrdCl.so.2.0.0)
==29093== Locks held: none
==29093== at 0x65073D21: XrdCl::Log::Dump(unsigned long, char const*, ...) (in /afs/cern.ch/cms/sw/ReleaseCandidates/vol0/slc6_amd64_gcc481/external/xrootd/4.0.4/lib/libXrdCl.so.2.0.0)
The current use of SetLogLevel / Dump are not thread-safe. Here's the corresponding code:
https://github.com/xrootd/xrootd/blob/master/src/XrdCl/XrdClLog.hh#L195
https://github.com/xrootd/xrootd/blob/master/src/XrdCl/XrdClLog.hh#L222
simultaneous calls result in undefined behavior.
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