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cP->dlType is being read outside of the lock. Diagnosed through the
following report from ThreadSanitizer:

WARNING: ThreadSanitizer: data race (pid=13166)
Write of size 1 at 0x7b28000100d0 by thread T29 (mutexes: write M0, write M0, write M1382, write M0, write M1385):
-0 XrdSys::IOEvents::Poller::TmoAdd(XrdSys::IOEvents::Channel*, int) /home/gbitzes/xrootd/src/XrdSys/XrdSysIOEvents.cc:1088 (libXrdUtils.so.2+0x0000000338f1)
-1 XrdSys::IOEvents::Channel::Enable(int, int, char const**) /home/gbitzes/xrootd/src/XrdSys/XrdSysIOEvents.cc:415 (libXrdUtils.so.2+0x0000000355b6)
-2 XrdCl::PollerBuiltIn::EnableWriteNotification(XrdCl::Socket*, bool, unsigned short) /home/gbitzes/xrootd/src/XrdCl/XrdClPollerBuiltIn.cc:481 (libXrdCl.so.2+0x000000063c50)
-3 XrdCl::AsyncSocketHandler::EnableUplink() /home/gbitzes/xrootd/src/./XrdCl/XrdClAsyncSocketHandler.hh:96 (libXrdCl.so.2+0x00000006d06f)
-4 XrdCl::Stream::EnableLink(XrdCl::PathID&) /home/gbitzes/xrootd/src/XrdCl/XrdClStream.cc:226 (libXrdCl.so.2+0x00000006d06f)
-5 XrdCl::Stream::Send(XrdCl::Message*, XrdCl::OutgoingMsgHandler*, bool, long) /home/gbitzes/xrootd/src/XrdCl/XrdClStream.cc:316 (libXrdCl.so.2+0x00000006e0d7)
-6 XrdCl::Channel::Send(XrdCl::Message*, XrdCl::OutgoingMsgHandler*, bool, long, XrdCl::VirtualRedirector*) /home/gbitzes/xrootd/src/XrdCl/XrdClChannel.cc:306 (libXrdCl.so.2+0x000000068686)
-7 XrdCl::PostMaster::Send(XrdCl::URL const&, XrdCl::Message*, XrdCl::OutgoingMsgHandler*, bool, long) /home/gbitzes/xrootd/src/XrdCl/XrdClPostMaster.cc:198 (libXrdCl.so.2+0x000000066ec9)
-8 XrdCl::MessageUtils::SendMessage(XrdCl::URL const&, XrdCl::Message*, XrdCl::ResponseHandler*, XrdCl::MessageSendParams const&) /home/gbitzes/xrootd/src/XrdCl/XrdClMessageUtils.cc:114 (libXrdCl.so.2+0x0000000b349e)
-9 XrdCl::FileSystem::Send(XrdCl::Message*, XrdCl::ResponseHandler*, XrdCl::MessageSendParams&) /home/gbitzes/xrootd/src/XrdCl/XrdClFileSystem.cc:1419 (libXrdCl.so.2+0x000000085b3d)
-10 XrdCl::FileSystem::Query(XrdCl::QueryCode::Code, XrdCl::Buffer const&, XrdCl::ResponseHandler*, unsigned short) /home/gbitzes/xrootd/src/XrdCl/XrdClFileSystem.cc:720 (libXrdCl.so.2+0x00000008fbe3)
-11 XrdCl::FileSystem::Query(XrdCl::QueryCode::Code, XrdCl::Buffer const&, XrdCl::Buffer*&, unsigned short) /home/gbitzes/xrootd/src/XrdCl/XrdClFileSystem.cc:732 (libXrdCl.so.2+0x00000009006e)
-12 backend::Query(XrdCl::FileSystem&, XrdCl::QueryCode::Code, XrdCl::Buffer&, XrdCl::Buffer*&) /afs/cern.ch/user/g/gbitzes/dev/eos/fusex/backend/backend.cc:875 (eosxd+0x00000067fb9f)
-13 backend::putMD(fuse_id const&, eos::fusex::md*, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, XrdSysMutex*) /afs/cern.ch/user/g/gbitzes/dev/eos/fusex/backend/backend.cc:454 (eosxd+0x00000068912e)
-14 metad::mdcflush(ThreadAssistant&) /afs/cern.ch/user/g/gbitzes/dev/eos/fusex/md/md.cc:1887 (eosxd+0x000000611515)
-15 void std::__invoke_impl<void, void (metad::)(ThreadAssistant&), metad, ThreadAssistant&>(std::__invoke_memfun_deref, void (metad::&&)(ThreadAssistant&), metad&&, ThreadAssistant&) /usr/include/c++/7/bits/invoke.h:73 (eosxd+0x0000005b1fb6)
-16 std::__invoke_result<void (metad::)(ThreadAssistant&), metad, ThreadAssistant&>::type std::__invoke<void (metad::)(ThreadAssistant&), metad, ThreadAssistant&>(void (metad::&&)(ThreadAssistant&), metad&&, ThreadAssistant&) /usr/include/c++/7/bits/invoke.h:95 (eosxd+0x0000005b1fb6)
-17 decltype (__invoke((_S_declval<0ul>)(), (_S_declval<1ul>)(), (_S_declval<2ul>)())) std::thread::_Invoker<std::tuple<void (metad::)(ThreadAssistant&), metad, ThreadAssistant&> >::_M_invoke<0ul, 1ul, 2ul>(std::_Index_tuple<0ul, 1ul, 2ul>) /usr/include/c++/7/thread:234 (eosxd+0x0000005b1fb6)
-18 std::thread::_Invoker<std::tuple<void (metad::)(ThreadAssistant&), metad, ThreadAssistant&> >::operator()() /usr/include/c++/7/thread:243 (eosxd+0x0000005b1fb6)
-19 std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (metad::)(ThreadAssistant&), metad, ThreadAssistant&> > >::_M_run() /usr/include/c++/7/thread:186 (eosxd+0x0000005b1fb6)
-20 (libstdc++.so.6+0x0000000bc01e)

Previous read of size 1 at 0x7b28000100d0 by thread T34:
-0 XrdSys::IOEvents::Poller::CbkTMO() /home/gbitzes/xrootd/src/XrdSys/XrdSysIOEvents.cc:597 (libXrdUtils.so.2+0x000000034d8a)
-1 XrdSys::IOEvents::Poller::TmoGet() /home/gbitzes/xrootd/src/XrdSys/XrdSysIOEvents.cc:1150 (libXrdUtils.so.2+0x000000035166)
-2 XrdSys::IOEvents::PollE::Begin(XrdSysSemaphore*, int&, char const**) /home/gbitzes/xrootd/src/./XrdSys/XrdSysIOEventsPollE.icc:213 (libXrdUtils.so.2+0x000000036787)
-3 XrdSys::IOEvents::BootStrap::Start(void*) /home/gbitzes/xrootd/src/XrdSys/XrdSysIOEvents.cc:131 (libXrdUtils.so.2+0x000000030c5c)
-4 XrdSysThread_Xeq /home/gbitzes/xrootd/src/XrdSys/XrdSysPthread.cc:86 (libXrdUtils.so.2+0x00000002d50f)
-5 (libtsan.so.0+0x0000000257eb)

You can view, comment on, or merge this pull request online at:

https://github.com/xrootd/xrootd/pull/624

Commit Summary

[XrdSys] Fix data race on cP->dlType

File Changes

M src/XrdSys/XrdSysIOEvents.cc (5)

Patch Links:

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