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We found today 8 machines in CMS which threads in a deadlock. Maybe this has been resolved already, this is Xrootd 3.3.6
#0 0x00000039f060e264 in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00000039f0609508 in _L_lock_854 () from /lib64/libpthread.so.0
#2 0x00000039f06093d7 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x000000000041a2a2 in Lock (this=0x7f854b00e600, dictid=1734875904, rTot=0, wTot=0) at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.hh:149
#4 XrdXrootdMonitorLock (this=0x7f854b00e600, dictid=1734875904, rTot=0, wTot=0) at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdMonitor.cc:199
#5 XrdXrootdMonitor::Close (this=0x7f854b00e600, dictid=1734875904, rTot=0, wTot=0) at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdMonitor.cc:353
#6 0x0000000000426ac4 in XrdXrootdProtocol::do_Close (this=0x7f8503712200) at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdXeq.cc:439
#7 0x00000039f224ee69 in XrdLink::DoIt (this=0x7f84f3549008) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdLink.cc:442
#8 0x00000039f2252d05 in XrdScheduler::Run (this=0x39f1c0b900) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:307
#9 0x00000039f2252ef9 in XrdStartWorking (carg=) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:84
#10 0x00000039f222165f in XrdSysThread_Xeq (myargs=0x7f8363af89e0) at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.cc:86
#11 0x00000039f06079d1 in start_thread () from /lib64/libpthread.so.0
#12 0x00000039f02e88fd in clone () from /lib64/libc.so.6
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