Thread 43 (Thread 0x7f07e62b1700 (LWP 21086)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000081e6db in ceph::log::Log::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 42 (Thread 0x7f07e5362700 (LWP 21090)):
#0  0x00007f07e87ef0c1 in sem_timedwait () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008d1b38 in CephContextServiceThread::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 41 (Thread 0x7f07e4b61700 (LWP 21091)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00000000008bdf4b in AdminSocket::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 40 (Thread 0x7f07e4360700 (LWP 21138)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000007e2431 in WBThrottle::get_next_should_flush(boost::tuples::tuple<hobject_t, std::tr1::shared_ptr<FDCache::FD>, WBThrottle::PendingWB, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>*) ()
#2  0x00000000007e2cfa in WBThrottle::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 39 (Thread 0x7f07dfb57700 (LWP 21139)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008a4299 in SimpleMessenger::reaper_entry() ()
#2  0x00000000008a9d4d in SimpleMessenger::ReaperThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 38 (Thread 0x7f07e0358700 (LWP 21140)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008a4299 in SimpleMessenger::reaper_entry() ()
#2  0x00000000008a9d4d in SimpleMessenger::ReaperThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 37 (Thread 0x7f07e0b59700 (LWP 21141)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008a4299 in SimpleMessenger::reaper_entry() ()
#2  0x00000000008a9d4d in SimpleMessenger::ReaperThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 36 (Thread 0x7f07e3b5f700 (LWP 21142)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008a4299 in SimpleMessenger::reaper_entry() ()
#2  0x00000000008a9d4d in SimpleMessenger::ReaperThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 35 (Thread 0x7f07e335e700 (LWP 21143)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008a4299 in SimpleMessenger::reaper_entry() ()
#2  0x00000000008a9d4d in SimpleMessenger::ReaperThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 34 (Thread 0x7f07e2b5d700 (LWP 21144)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b1e1b in SafeTimer::timer_thread() ()
#2  0x00000000008b27cd in SafeTimerThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 33 (Thread 0x7f07e235c700 (LWP 21145)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b18c7 in SafeTimer::timer_thread() ()
#2  0x00000000008b27cd in SafeTimerThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 32 (Thread 0x7f07e1b5b700 (LWP 21234)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000007919e4 in FileStore::sync_entry() ()
#2  0x00000000007adedd in FileStore::SyncThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 31 (Thread 0x7f07e135a700 (LWP 21235)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000076ddd8 in FileJournal::write_thread_entry() ()
#2  0x000000000069bacd in FileJournal::Writer::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 30 (Thread 0x7f07df356700 (LWP 21236)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000764fcf in FileJournal::write_finish_thread_entry() ()
#2  0x000000000069baad in FileJournal::WriteFinisher::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 29 (Thread 0x7f07deb55700 (LWP 21237)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000080eab0 in Finisher::finisher_thread_entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 28 (Thread 0x7f07de354700 (LWP 21238)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 27 (Thread 0x7f07ddb53700 (LWP 21239)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 26 (Thread 0x7f07dd352700 (LWP 21240)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000080eab0 in Finisher::finisher_thread_entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 25 (Thread 0x7f07dcb51700 (LWP 21241)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000080eab0 in Finisher::finisher_thread_entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 24 (Thread 0x7f07dc350700 (LWP 21242)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b18c7 in SafeTimer::timer_thread() ()
#2  0x00000000008b27cd in SafeTimerThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 23 (Thread 0x7f07da632700 (LWP 21252)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000988f88 in DispatchQueue::entry() ()
#2  0x00000000008a927d in DispatchQueue::DispatchThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 22 (Thread 0x7f07d9e31700 (LWP 21253)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000096bf75 in Accepter::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 21 (Thread 0x7f07d9630700 (LWP 21254)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000988f88 in DispatchQueue::entry() ()
#2  0x00000000008a927d in DispatchQueue::DispatchThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 20 (Thread 0x7f07d8e2f700 (LWP 21255)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000096bf75 in Accepter::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 19 (Thread 0x7f07d862e700 (LWP 21256)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000988f88 in DispatchQueue::entry() ()
#2  0x00000000008a927d in DispatchQueue::DispatchThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 18 (Thread 0x7f07d7e2d700 (LWP 21257)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000988f88 in DispatchQueue::entry() ()
#2  0x00000000008a927d in DispatchQueue::DispatchThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 17 (Thread 0x7f07d762c700 (LWP 21258)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000096bf75 in Accepter::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 16 (Thread 0x7f07d6e2b700 (LWP 21259)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x0000000000988f88 in DispatchQueue::entry() ()
#2  0x00000000008a927d in DispatchQueue::DispatchThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 15 (Thread 0x7f07d662a700 (LWP 21260)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000096bf75 in Accepter::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 14 (Thread 0x7f07d5e29700 (LWP 21261)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b1e1b in SafeTimer::timer_thread() ()
#2  0x00000000008b27cd in SafeTimerThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 13 (Thread 0x7f07d5628700 (LWP 21262)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000080eab0 in Finisher::finisher_thread_entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 12 (Thread 0x7f07d4e27700 (LWP 21263)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0

#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 11 (Thread 0x7f07d4626700 (LWP 21264)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7f07d3e25700 (LWP 21265)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f07d3624700 (LWP 21266)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f07d2e23700 (LWP 21267)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b4f5e in ThreadPool::worker(ThreadPool::WorkThread*) ()
#2  0x00000000008b68e0 in ThreadPool::WorkThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f07d2622700 (LWP 21268)):
#0  0x00007f07e87ed0fe in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000066e129 in OSD::heartbeat_entry() ()
#2  0x00000000006b719d in OSD::T_Heartbeat::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f07d1e21700 (LWP 21269)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000080eab0 in Finisher::finisher_thread_entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f07d1620700 (LWP 21270)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008b18c7 in SafeTimer::timer_thread() ()
#2  0x00000000008b27cd in SafeTimerThread::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f07e9338700 (LWP 21271)):
#0  0x00007f07e87ecd84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000009a78f3 in Pipe::writer() ()
#2  0x00000000009b286d in Pipe::Writer::entry() ()
#3  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f07d0e1f700 (LWP 21280)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000000000099aff2 in Pipe::tcp_read_wait() ()
#2  0x000000000099b310 in Pipe::tcp_read(char*, int) ()
---Type <return> to continue, or q <return> to quit---
#3  0x00000000009aeda0 in Pipe::reader() ()
#4  0x00000000009b288d in Pipe::Reader::entry() ()
#5  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f07d0d1e700 (LWP 21512)):
#0  0x00007f07e700da43 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00000000007fc7e4 in SignalHandler::entry() ()
#2  0x00007f07e87e8e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#3  0x00007f07e70193fd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f07e93567c0 (LWP 21084)):
#0  0x00007f07e87ea148 in pthread_join () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000008ac462 in Thread::join(void**) ()
#2  0x00000000008a35b5 in SimpleMessenger::wait() ()
#3  0x00000000005bb98e in main ()