Happens regularly when trying to umount eos fuse, running with XRootD 4.4.0.

"""
Thread 3 (Thread 0x7fe40e5f1700 (LWP 19733)):
#0 0x00007fe414719334 in __lll_lock_wait () from /lib64/libpthread.so.0
#1 0x00007fe4147145d8 in _L_lock_854 () from /lib64/libpthread.so.0
#2 0x00007fe4147144a7 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3 0x00007fe414bf5b70 in XrdCl::PollerBuiltIn::RemoveSocket(XrdCl::Socket) () from /usr/lib64/libXrdCl.so.2
#4 0x00007fe414c40ebb in XrdCl::AsyncSocketHandler::Close() () from /usr/lib64/libXrdCl.so.2
#5 0x00007fe414bfaccb in XrdCl::Stream::Disconnect(bool) () from /usr/lib64/libXrdCl.so.2
#6 0x00007fe414bfc22c in XrdCl::Stream::OnReadTimeout(unsigned short) () from /usr/lib64/libXrdCl.so.2
#7 0x00007fe414c427a7 in XrdCl::AsyncSocketHandler::Event(unsigned char, XrdCl::Socket) () from /usr/lib64/libXrdCl.so.2
#8 0x00007fe414bf5333 in ?? () from /usr/lib64/libXrdCl.so.2
#9 0x00007fe414953a88 in XrdSys::IOEvents::Poller::CbkXeq(XrdSys::IOEvents::Channel, int, int, char const) () from /usr/lib64/libXrdUtils.so.2
#10 0x00007fe414953d17 in XrdSys::IOEvents::Poller::CbkTMO() () from /usr/lib64/libXrdUtils.so.2
#11 0x00007fe414953d7d in XrdSys::IOEvents::Poller::TmoGet() () from /usr/lib64/libXrdUtils.so.2
#12 0x00007fe414953de8 in XrdSys::IOEvents::PollE::Begin(XrdSysSemaphore, int&, char const) () from /usr/lib64/libXrdUtils.so.2
#13 0x00007fe41495269d in XrdSys::IOEvents::BootStrap::Start(void) () from /usr/lib64/libXrdUtils.so.2
#14 0x00007fe41495051f in XrdSysThread_Xeq () from /usr/lib64/libXrdUtils.so.2
#15 0x00007fe414712aa1 in start_thread () from /lib64/libpthread.so.0
#16 0x00007fe41272aaad in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fe4013ff700 (LWP 19751)):
#0 0x00007fe41471668c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x0000000000470ecb in eos::common::ConcurrentQueue::wait_pop(CacheEntry&) ()
#2 0x0000000000470277 in FuseWriteCache::RunThreadWrites() ()
#3 0x0000000000470299 in FuseWriteCache::StartWriterThread(void) ()
#4 0x00007fe41495051f in XrdSysThread_Xeq () from /usr/lib64/libXrdUtils.so.2
#5 0x00007fe414712aa1 in start_thread () from /lib64/libpthread.so.0
#6 0x00007fe41272aaad in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fe4156bc880 (LWP 19732)):
#0 0x00007fe414718a00 in sem_wait () from /lib64/libpthread.so.0
#1 0x00007fe414952b06 in XrdSys::IOEvents::Poller::SendCmd(XrdSys::IOEvents::Poller::PipeData&) () from /usr/lib64/libXrdUtils.so.2
#2 0x00007fe414952c78 in XrdSys::IOEvents::PollE::Exclude(XrdSys::IOEvents::Channel*, bool&, bool) () from /usr/lib64/libXrdUtils.so.2
#3 0x00007fe41495271f in XrdSys::IOEvents::Channel::Delete() () from /usr/lib64/libXrdUtils.so.2
#4 0x00007fe414bf5608 in XrdCl::PollerBuiltIn::Stop() () from /usr/lib64/libXrdCl.so.2
#5 0x00007fe414be7bfa in XrdCl::DefaultEnv::Finalize() () from /usr/lib64/libXrdCl.so.2
#6 0x00007fe412677e7d in __cxa_finalize () from /lib64/libc.so.6
#7 0x00007fe414bdcae6 in ?? () from /usr/lib64/libXrdCl.so.2
#8 0x0000000000000037 in ?? ()
#9 0x0000000000000000 in ?? ()
(gdb)
"""

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