Not sure if this is a real issue but just had a stalled shutdown on a node:
The node is running the master at c7e73eafa139c29a38f73ab697e2e967a386908d from Wed Apr 5 11:29:19 2017.
As you can see, it took > 7 mins from a requested shutdown to a net thread exit. Debug log:
02017-04-14 07:34:12 Shutdown: In progress...
12017-04-14 07:41:47 net thread exit
22017-04-14 07:41:47 sending version (103 bytes) peer=193
32017-04-14 07:41:47 msghand thread exit
42017-04-14 07:41:47 send version message: version 70015, blocks=461809, us=[::]:0, peer=193
52017-04-14 07:41:47 opencon thread exit
62017-04-14 07:41:47 Flushed 69008 addresses to peers.dat 109ms
72017-04-14 07:41:47 disconnecting peer=0
82017-04-14 07:41:47 disconnecting peer=1
92017-04-14 07:41:47 disconnecting peer=5
102017-04-14 07:41:47 disconnecting peer=7
112017-04-14 07:41:47 disconnecting peer=19
122017-04-14 07:41:47 disconnecting peer=24
132017-04-14 07:41:47 disconnecting peer=25
142017-04-14 07:41:47 disconnecting peer=38
152017-04-14 07:41:47 disconnecting peer=58
162017-04-14 07:41:47 disconnecting peer=137
172017-04-14 07:41:47 disconnecting peer=169
182017-04-14 07:41:47 disconnecting peer=178
192017-04-14 07:41:47 disconnecting peer=183
202017-04-14 07:41:47 disconnecting peer=185
212017-04-14 07:41:47 disconnecting peer=190
222017-04-14 07:41:47 disconnecting peer=193
232017-04-14 07:41:48 Dumped mempool: 0.046245s to copy, 0.174033s to dump
242017-04-14 07:41:48 Shutdown: done
The backtraces during the stalling are:
0(gdb) thread apply all bt
1
2Thread 5 (Thread 0x7f777ffff700 (LWP 2034)):
3[#0](/bitcoin-bitcoin/0/) pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
4[#1](/bitcoin-bitcoin/1/) 0x00007f77b76419eb in BGThread (this=0x7f77b8dd94b0) at leveldb/util/env_posix.cc:574
5[#2](/bitcoin-bitcoin/2/) leveldb::(anonymous namespace)::PosixEnv::BGThreadWrapper (arg=0x7f77b8dd94b0) at leveldb/util/env_posix.cc:521
6[#3](/bitcoin-bitcoin/3/) 0x00007f77b4a93064 in start_thread (arg=0x7f777ffff700) at pthread_create.c:309
7[#4](/bitcoin-bitcoin/4/) 0x00007f77b47c862d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
8
9Thread 4 (Thread 0x7f7767fff700 (LWP 2038)):
10[#0](/bitcoin-bitcoin/0/) __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
11[#1](/bitcoin-bitcoin/1/) 0x00007f77b4a95494 in _L_lock_952 () from /lib/x86_64-linux-gnu/libpthread.so.0
12[#2](/bitcoin-bitcoin/2/) 0x00007f77b4a952f6 in __GI___pthread_mutex_lock (mutex=0x7f775c1d12e8) at ../nptl/pthread_mutex_lock.c:114
13[#3](/bitcoin-bitcoin/3/) 0x00007f77b730fd2d in lock (this=<optimized out>) at /usr/include/boost/thread/pthread/recursive_mutex.hpp:110
14[#4](/bitcoin-bitcoin/4/) lock (this=<optimized out>) at sync.h:60
15[#5](/bitcoin-bitcoin/5/) lock (this=0x7f7767feeb50) at /usr/include/boost/thread/lock_types.hpp:346
16[#6](/bitcoin-bitcoin/6/) Enter (pszName=<optimized out>, pszFile=<optimized out>, nLine=<optimized out>, this=0x7f7767feeb50) at sync.h:124
17[#7](/bitcoin-bitcoin/7/) CMutexLock<CCriticalSection>::CMutexLock (this=0x7f7767feeb50, mutexIn=..., pszName=<optimized out>, pszFile=<optimized out>, nLine=<optimized out>, fTry=<optimized out>) at sync.h:145
18[#8](/bitcoin-bitcoin/8/) 0x00007f77b733bcfa in CConnman::ThreadSocketHandler (this=0x7f77b8ddc010) at net.cpp:1293
19[#9](/bitcoin-bitcoin/9/) 0x00007f77b730c68d in operator() (this=0x7f7767ffeeb0) at /usr/include/c++/4.9/functional:2439
20[#10](/bitcoin-bitcoin/10/) TraceThread<std::function<void ()> >(char const*, std::function<void ()>) (name=0x7f77b76c9cfc "net", func=...) at util.h:266
21[#11](/bitcoin-bitcoin/11/) 0x00007f77b733f95b in _M_invoke<0ul, 1ul> (this=<optimized out>) at /usr/include/c++/4.9/functional:1700
22[#12](/bitcoin-bitcoin/12/) operator() (this=<optimized out>) at /usr/include/c++/4.9/functional:1688
23[#13](/bitcoin-bitcoin/13/) std::thread::_Impl<std::_Bind_simple<void (*(char const*, std::function<void ()>))(char const*, std::function<void ()>)> >::_M_run() (this=<optimized out>) at /usr/include/c++/4.9/thread:115
24[#14](/bitcoin-bitcoin/14/) 0x00007f77b5275970 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
25[#15](/bitcoin-bitcoin/15/) 0x00007f77b4a93064 in start_thread (arg=0x7f7767fff700) at pthread_create.c:309
26[#16](/bitcoin-bitcoin/16/) 0x00007f77b47c862d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
27
28Thread 3 (Thread 0x7f77667fc700 (LWP 2041)):
29[#0](/bitcoin-bitcoin/0/) __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
30[#1](/bitcoin-bitcoin/1/) 0x00007f77b4a95494 in _L_lock_952 () from /lib/x86_64-linux-gnu/libpthread.so.0
31[#2](/bitcoin-bitcoin/2/) 0x00007f77b4a952f6 in __GI___pthread_mutex_lock (mutex=0x7f77b7a73880 <cs_main>) at ../nptl/pthread_mutex_lock.c:114
32[#3](/bitcoin-bitcoin/3/) 0x00007f77b730fd2d in lock (this=<optimized out>) at /usr/include/boost/thread/pthread/recursive_mutex.hpp:110
33[#4](/bitcoin-bitcoin/4/) lock (this=<optimized out>) at sync.h:60
34---Type <return> to continue, or q <return> to quit---
35[#5](/bitcoin-bitcoin/5/) lock (this=0x7f77667fb690) at /usr/include/boost/thread/lock_types.hpp:346
36[#6](/bitcoin-bitcoin/6/) Enter (pszName=<optimized out>, pszFile=<optimized out>, nLine=<optimized out>, this=0x7f77667fb690) at sync.h:124
37[#7](/bitcoin-bitcoin/7/) CMutexLock<CCriticalSection>::CMutexLock (this=0x7f77667fb690, mutexIn=..., pszName=<optimized out>, pszFile=<optimized out>, nLine=<optimized out>, fTry=<optimized out>) at sync.h:145
38[#8](/bitcoin-bitcoin/8/) 0x00007f77b735e512 in (anonymous namespace)::InitializeNode (pnode=0x7f774c2ba150, connman=...) at net_processing.cpp:271
39[#9](/bitcoin-bitcoin/9/) 0x00007f77b7353e36 in operator() (a1=..., a0=<optimized out>, this=<optimized out>) at /usr/include/boost/function/function_template.hpp:767
40[#10](/bitcoin-bitcoin/10/) m_invoke<boost::function<void(CNode*, CConnman&)>, 0u, 1u, CNode*&, CConnman&> (args=..., func=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:92
41[#11](/bitcoin-bitcoin/11/) operator()<boost::function<void(CNode*, CConnman&)>, CNode*&, CConnman&, 2ul> (args=..., func=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:81
42[#12](/bitcoin-bitcoin/12/) m_invoke<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > > (connectionBody=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:117
43[#13](/bitcoin-bitcoin/13/) operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > > (connectionBody=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:110
44[#14](/bitcoin-bitcoin/14/) dereference (this=0x7f77667fb7d0) at /usr/include/boost/signals2/detail/slot_call_iterator.hpp:82
45[#15](/bitcoin-bitcoin/15/) dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, CNode*, CConnman&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > > (f=...) at /usr/include/boost/iterator/iterator_facade.hpp:514
46[#16](/bitcoin-bitcoin/16/) operator* (this=0x7f77667fb7d0) at /usr/include/boost/iterator/iterator_facade.hpp:639
47[#17](/bitcoin-bitcoin/17/) operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, CNode*, CConnman&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > > (last=..., first=..., this=<optimized out>) at /usr/include/boost/signals2/optional_last_value.hpp:55
48[#18](/bitcoin-bitcoin/18/) operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, CNode*, CConnman&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(CNode*, CConnman&), boost::function<void(CNode*, CConnman&)> >, boost::signals2::mutex> > > (last=..., first=..., combiner=..., this=<optimized out>) at /usr/include/boost/signals2/detail/result_type_wrapper.hpp:64
49[#19](/bitcoin-bitcoin/19/) boost::signals2::detail::signal_impl<void (CNode*, CConnman&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (CNode*, CConnman&)>, boost::function<void (boost::signals2::connection const&, CNode*, CConnman&)>, boost::signals2::mutex>::operator()(CNode*, CConnman&) (this=<optimized out>, args#0=0x7f774c2ba150, args#1=...) at /usr/include/boost/signals2/detail/signal_template.hpp:246
50[#20](/bitcoin-bitcoin/20/) 0x00007f77b7334d2d in operator() (args#1=..., args#0=<optimized out>, this=0x7f77b7a718f0 <g_signals+48>) at /usr/include/boost/signals2/detail/signal_template.hpp:695
51[#21](/bitcoin-bitcoin/21/) CConnman::OpenNetworkConnection (this=this@entry=0x7f77b8ddc010, addrConnect=..., fCountFailure=<optimized out>, grantOutbound=grantOutbound@entry=0x7f77667fbbb0, pszDest=pszDest@entry=0x0,
52 fOneShot=fOneShot@entry=false, fFeeler=false, fAddnode=false) at net.cpp:1940
53[#22](/bitcoin-bitcoin/22/) 0x00007f77b7335b1b in CConnman::ThreadOpenConnections (this=<optimized out>) at net.cpp:1814
54[#23](/bitcoin-bitcoin/23/) 0x00007f77b730c68d in operator() (this=0x7f77667fbeb0) at /usr/include/c++/4.9/functional:2439
55[#24](/bitcoin-bitcoin/24/) TraceThread<std::function<void ()> >(char const*, std::function<void ()>) (name=0x7f77b768222c "opencon", func=...) at util.h:266
56---Type <return> to continue, or q <return> to quit---
57[#25](/bitcoin-bitcoin/25/) 0x00007f77b733f95b in _M_invoke<0ul, 1ul> (this=<optimized out>) at /usr/include/c++/4.9/functional:1700
58[#26](/bitcoin-bitcoin/26/) operator() (this=<optimized out>) at /usr/include/c++/4.9/functional:1688
59[#27](/bitcoin-bitcoin/27/) std::thread::_Impl<std::_Bind_simple<void (*(char const*, std::function<void ()>))(char const*, std::function<void ()>)> >::_M_run() (this=<optimized out>) at /usr/include/c++/4.9/thread:115
60[#28](/bitcoin-bitcoin/28/) 0x00007f77b5275970 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
61[#29](/bitcoin-bitcoin/29/) 0x00007f77b4a93064 in start_thread (arg=0x7f77667fc700) at pthread_create.c:309
62[#30](/bitcoin-bitcoin/30/) 0x00007f77b47c862d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
63
64Thread 2 (Thread 0x7f7765ffb700 (LWP 2042)):
65[#0](/bitcoin-bitcoin/0/) 0x00007f77b4a99f0b in __libc_send (fd=43, buf=0x7f77508b89b0, n=998120, flags=-1) at ../sysdeps/unix/sysv/linux/x86_64/send.c:31
66[#1](/bitcoin-bitcoin/1/) 0x00007f77b732d728 in CConnman::SocketSendData (this=this@entry=0x7f77b8ddc010, pnode=pnode@entry=0x7f775c1d1240) at net.cpp:844
67[#2](/bitcoin-bitcoin/2/) 0x00007f77b7331b64 in CConnman::PushMessage(CNode*, CSerializedNetMsg&&) (this=this@entry=0x7f77b8ddc010, pnode=pnode@entry=0x7f775c1d1240,
68 msg=msg@entry=<unknown type in /home/jonasschnelli/bitcoin/bitcoin/src/bitcoind, CU 0x31d41a, DIE 0x4c1e2c>) at net.cpp:2770
69[#3](/bitcoin-bitcoin/3/) 0x00007f77b7367b54 in ProcessGetData (pfrom=0x7f775c1d1240, pfrom@entry=0x7f7765ff9470, consensusParams=..., connman=..., interruptMsgProc=...) at net_processing.cpp:1045
70[#4](/bitcoin-bitcoin/4/) 0x00007f77b736cef6 in ProcessMessage (pfrom=0x7f7765ff9470, pfrom@entry=0x7f775c1d1240, strCommand="", vRecv=..., nTimeReceived=<optimized out>, chainparams=..., connman=..., interruptMsgProc=...)
71 at net_processing.cpp:1600
72[#5](/bitcoin-bitcoin/5/) 0x00007f77b737fe29 in ProcessMessages (pfrom=0x7f775c1d1240, connman=..., interruptMsgProc=...) at net_processing.cpp:2717
73[#6](/bitcoin-bitcoin/6/) 0x00007f77b7354c54 in operator() (a2=..., a1=..., a0=<optimized out>, this=<optimized out>) at /usr/include/boost/function/function_template.hpp:767
74[#7](/bitcoin-bitcoin/7/) m_invoke<bool, boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)>, 0u, 1u, 2u, CNode*&, CConnman&, std::atomic<bool>&> (args=..., func=..., this=<optimized out>)
75 at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:87
76[#8](/bitcoin-bitcoin/8/) operator()<boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)>, CNode*&, CConnman&, std::atomic<bool>&, 3ul> (args=..., func=..., this=<optimized out>)
77 at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:81
78[#9](/bitcoin-bitcoin/9/) m_invoke<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > > (connectionBody=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:123
79[#10](/bitcoin-bitcoin/10/) operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > > (connectionBody=..., this=<optimized out>) at /usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:110
80[#11](/bitcoin-bitcoin/11/) dereference (this=0x7f7765ffab20) at /usr/include/boost/signals2/detail/slot_call_iterator.hpp:82
81[#12](/bitcoin-bitcoin/12/) dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<bool, CNode*, CConnman&, std::atomic<bool>&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > > (f=...) at /usr/include/boost/iterator/iterator_facade.hpp:514
82[#13](/bitcoin-bitcoin/13/) operator* (this=0x7f7765ffab20) at /usr/include/boost/iterator/iterator_facade.hpp:639
83[#14](/bitcoin-bitcoin/14/) operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<bool, CNode*, CConnman&, std::atomic<bool>&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&---Type <return> to continue, or q <return> to quit---
84)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > > (last=..., first=..., this=<optimized out>) at net.h:419
85[#15](/bitcoin-bitcoin/15/) operator()<CombinerAll, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<bool, CNode*, CConnman&, std::atomic<bool>&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<bool(CNode*, CConnman&, std::atomic<bool>&), boost::function<bool(CNode*, CConnman&, std::atomic<bool>&)> >, boost::signals2::mutex> > > (last=..., first=..., combiner=..., this=<optimized out>)
86 at /usr/include/boost/signals2/detail/result_type_wrapper.hpp:53
87[#16](/bitcoin-bitcoin/16/) boost::signals2::detail::signal_impl<bool (CNode*, CConnman&, std::atomic<bool>&), CombinerAll, int, std::less<int>, boost::function<bool (CNode*, CConnman&, std::atomic<bool>&)>, boost::function<bool (boost::signals2::connection const&, CNode*, CConnman&, std::atomic<bool>&)>, boost::signals2::mutex>::operator()(CNode*, CConnman&, std::atomic<bool>&) (this=<optimized out>, args#0=args#0@entry=0x7f775c1d1240, args#1=...,
88 args#2=...) at /usr/include/boost/signals2/detail/signal_template.hpp:246
89[#17](/bitcoin-bitcoin/17/) 0x00007f77b7336cd8 in operator() (args#2=..., args#1=..., args#0=0x7f775c1d1240, this=0x7f77b7a718c0 <g_signals>) at /usr/include/boost/signals2/detail/signal_template.hpp:695
90[#18](/bitcoin-bitcoin/18/) CConnman::ThreadMessageHandler (this=0x7f77b8ddc010) at net.cpp:1970
91[#19](/bitcoin-bitcoin/19/) 0x00007f77b730c68d in operator() (this=0x7f7765ffaeb0) at /usr/include/c++/4.9/functional:2439
92[#20](/bitcoin-bitcoin/20/) TraceThread<std::function<void ()> >(char const*, std::function<void ()>) (name=0x7f77b7682234 "msghand", func=...) at util.h:266
93[#21](/bitcoin-bitcoin/21/) 0x00007f77b733f95b in _M_invoke<0ul, 1ul> (this=<optimized out>) at /usr/include/c++/4.9/functional:1700
94[#22](/bitcoin-bitcoin/22/) operator() (this=<optimized out>) at /usr/include/c++/4.9/functional:1688
95[#23](/bitcoin-bitcoin/23/) std::thread::_Impl<std::_Bind_simple<void (*(char const*, std::function<void ()>))(char const*, std::function<void ()>)> >::_M_run() (this=<optimized out>) at /usr/include/c++/4.9/thread:115
96[#24](/bitcoin-bitcoin/24/) 0x00007f77b5275970 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
97[#25](/bitcoin-bitcoin/25/) 0x00007f77b4a93064 in start_thread (arg=0x7f7765ffb700) at pthread_create.c:309
98[#26](/bitcoin-bitcoin/26/) 0x00007f77b47c862d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
99
100Thread 1 (Thread 0x7f77b7a41740 (LWP 2018)):
101[#0](/bitcoin-bitcoin/0/) 0x00007f77b4a9449b in pthread_join (threadid=140150789093120, thread_return=0x0) at pthread_join.c:92
102[#1](/bitcoin-bitcoin/1/) 0x00007f77b5275837 in std::thread::join() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
103[#2](/bitcoin-bitcoin/2/) 0x00007f77b733dc4f in CConnman::Stop (this=this@entry=0x7f77b8ddc010) at net.cpp:2342
104[#3](/bitcoin-bitcoin/3/) 0x00007f77b733e2ac in CConnman::~CConnman (this=0x7f77b8ddc010, __in_chrg=<optimized out>) at net.cpp:2395
105[#4](/bitcoin-bitcoin/4/) 0x00007f77b72e8ec1 in operator() (this=<optimized out>, __ptr=0x7f77b8ddc010) at /usr/include/c++/4.9/bits/unique_ptr.h:76
106[#5](/bitcoin-bitcoin/5/) reset (__p=0x7f77b8ddc010, this=0x7f77b7a715d0 <g_connman>) at /usr/include/c++/4.9/bits/unique_ptr.h:344
107[#6](/bitcoin-bitcoin/6/) Shutdown () at init.cpp:206
108[#7](/bitcoin-bitcoin/7/) 0x00007f77b72d8073 in AppInit (argc=<optimized out>, argv=<optimized out>) at bitcoind.cpp:184
109[#8](/bitcoin-bitcoin/8/) 0x00007f77b72cac1f in main (argc=3, argv=0x7ffdf20c7978) at bitcoind.cpp:196
