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Note this doesn't fix all deadlocks in the python bindings. The following is still possible:
Thread 4 (Thread 0x2b0ca2fec700 (LWP 1104273)):
#0 0x00002b0c9e77b790 in sem_wait () from /lib64/libpthread.so.0
#1 0x00002b0c9e4b47b5 in PyThread_acquire_lock () from /lib64/libpython2.7.so.1.0
#2 0x00002b0c9e4838a6 in PyEval_RestoreThread () from /lib64/libpython2.7.so.1.0
#3 0x00002b0c9e4a3518 in PyGILState_Ensure () from /lib64/libpython2.7.so.1.0
#4 0x00002b0ca12dff05 in PyXRootD::AsyncResponseHandler<XrdCl::ChunkInfo>::HandleResponseWithHosts(XrdCl::XRootDStatus*, XrdCl::AnyObject*, std::vector<XrdCl::HostInfo, std::allocator<XrdCl::HostInfo> >*) () from /usr/lib64/python2.7/site-packages/pyxrootd/client.so
#5 0x00002b0ca157c0be in (anonymous namespace)::StatefulHandler::HandleResponseWithHosts(XrdCl::XRootDStatus*, XrdCl::AnyObject*, std::vector<XrdCl::HostInfo, std::allocator<XrdCl::HostInfo> >*) () from /lib64/libXrdCl.so.2
#6 0x00002b0ca155f87b in XrdCl::XRootDMsgHandler::HandleResponse() () from /lib64/libXrdCl.so.2
#7 0x00002b0ca1561a38 in XrdCl::XRootDMsgHandler::Process(XrdCl::Message*) () from /lib64/libXrdCl.so.2
#8 0x00002b0ca154597e in XrdCl::Stream::HandleIncMsgJob::Run(void*) () from /lib64/libXrdCl.so.2
#9 0x00002b0ca15a6dcf in XrdCl::JobManager::RunJobs() () from /lib64/libXrdCl.so.2
#10 0x00002b0ca15a7029 in RunRunnerThread () from /lib64/libXrdCl.so.2
#11 0x00002b0c9e775dc5 in start_thread () from /lib64/libpthread.so.0
#12 0x00002b0c9f18921d in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x2b0c9e1b3880 (LWP 1104270)):
#0 0x00002b0c9e776ef7 in pthread_join () from /lib64/libpthread.so.0
#1 0x00002b0ca15a6a53 in XrdCl::JobManager::StopWorkers(unsigned int) () from /lib64/libXrdCl.so.2
#2 0x00002b0ca15a6ce6 in XrdCl::JobManager::Stop() () from /lib64/libXrdCl.so.2
#3 0x00002b0ca153e551 in XrdCl::PostMaster::Stop() () from /lib64/libXrdCl.so.2
#4 0x00002b0ca152b95a in XrdCl::DefaultEnv::Finalize() () from /lib64/libXrdCl.so.2
#5 0x00002b0c9f0cbe69 in __run_exit_handlers () from /lib64/libc.so.6
#6 0x00002b0c9f0cbeb5 in exit () from /lib64/libc.so.6
#7 0x00002b0c9e4a4b4f in Py_Exit () from /lib64/libpython2.7.so.1.0
#8 0x00002b0c9e4a4c87 in handle_system_exit.part.2 () from /lib64/libpython2.7.so.1.0
#9 0x00002b0c9e4a4f4d in PyErr_PrintEx () from /lib64/libpython2.7.so.1.0
#10 0x00002b0c9e4a5b6e in PyRun_SimpleFileExFlags () from /lib64/libpython2.7.so.1.0
#11 0x00002b0c9e4b6b9f in Py_Main () from /lib64/libpython2.7.so.1.0
#12 0x00002b0c9f0b4b15 in __libc_start_main () from /lib64/libc.so.6
#13 0x0000000000400721 in _start ()
(cut out irrelevant threads).
That deadlock occurs when python shuts down while callbacks are still pending.
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