SIGABRT in ~ProxyClientBase with #29409 and rust client #219

issue ryanofsky openend this issue on September 29, 2025
ryanofsky commented at 2:00 pm on September 29, 2025: collaborator
Originally posted by @TheCharlatan in https://github.com/bitcoin/bitcoin/issues/29409#issuecomment-3345899017
Thanks for the rebase :)
I updated darosior’s core_bdk_wallet to use this newest version and I ran into a few crashes again. This is the one I managed to get a reproducible backtrace for:
 02025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server post request  [#32](/bitcoin-core-multiprocess/32/) {bitcoin-node-165737/b-capnp-loop-166141 (from )}
 12025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server send response [#32](/bitcoin-core-multiprocess/32/) Chain.handleNotifications$Results (result = <external capability>)
 22025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server destroy N2mp11ProxyServerIN3ipc5capnp8messages7HandlerEEE
 32025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165873} IPC client destroy N2mp11ProxyClientIN3ipc5capnp8messages18ChainNotificationsEEE
 42025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165873} IPC client first request from current thread, constructing waiter
 52025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165873} IPC client send ChainNotifications.destroy$Params (context = (thread = <external capability>, callbackThread = <external capability>))
 62025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server destroy N2mp11ProxyServerIN3ipc5capnp8messages5ChainEEE
 72025-09-29T11:18:20Z [ipc] IPC client method call interrupted by disconnect.
 8terminate called after throwing an instance of 'ipc::Exception'
 9  what():  IPC client method call interrupted by disconnect.
10[Thread 0x7ffed37fe6c0 (LWP 166141) exited]
112025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server: socket disconnected.
122025-09-29T11:18:20Z [ipc] {bitcoin-node-165737/b-capnp-loop-165742} IPC server destroy N2mp11ProxyServerIN3ipc5capnp8messages4InitEEE
13
14Thread 45 "b-capnp-loop" received signal SIGABRT, Aborted.
15[Switching to Thread 0x7ffed2ffd6c0 (LWP 165873)]
16__pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
17warning: 44	./nptl/pthread_kill.c: No such file or directory
18(gdb) bt
19[#0](/bitcoin-core-multiprocess/0/)  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
20[#1](/bitcoin-core-multiprocess/1/)  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
21[#2](/bitcoin-core-multiprocess/2/)  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
22[#3](/bitcoin-core-multiprocess/3/)  0x00007ffff724527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
23[#4](/bitcoin-core-multiprocess/4/)  0x00007ffff72288ff in __GI_abort () at ./stdlib/abort.c:79
24[#5](/bitcoin-core-multiprocess/5/)  0x00007ffff76a5ff5 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
25[#6](/bitcoin-core-multiprocess/6/)  0x00007ffff76bb0da in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
26[#7](/bitcoin-core-multiprocess/7/)  0x00007ffff76a5a55 in std::terminate() () from /lib/x86_64-linux-gnu/libstdc++.so.6
27[#8](/bitcoin-core-multiprocess/8/)  0x000055555563c47f in __clang_call_terminate ()
28[#9](/bitcoin-core-multiprocess/9/)  0x0000555555b39999 in mp::ProxyClientBase<ipc::capnp::messages::ChainNotifications, interfaces::Chain::Notifications>::~ProxyClientBase (this=0x7ffed40cfe60)
29    at ./ipc/libmultiprocess/include/mp/proxy-io.h:468
30[#10](/bitcoin-core-multiprocess/10/) 0x0000555555b36e9f in mp::ProxyClient<ipc::capnp::messages::ChainNotifications>::~ProxyClient (this=0x28769)
31    at /home/drgrid/bitcoin/build_dev_mode_clang/src/ipc/capnp/chain.capnp.proxy-types.c++:12
32[#11](/bitcoin-core-multiprocess/11/) 0x000055555575637e in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x7ffed40049a0)
33    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:346
34[#12](/bitcoin-core-multiprocess/12/) std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=<optimized out>)
35    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1071
36[#13](/bitcoin-core-multiprocess/13/) std::__shared_ptr<interfaces::Chain::Notifications, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=<optimized out>)
37    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1524
38[#14](/bitcoin-core-multiprocess/14/) node::(anonymous namespace)::NotificationsProxy::~NotificationsProxy (this=<optimized out>) at ./node/interfaces.cpp:456
39[#15](/bitcoin-core-multiprocess/15/) 0x0000555555755fbc in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x7ffed4000d80)
40    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:346
41[#16](/bitcoin-core-multiprocess/16/) std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=<optimized out>)
42    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1071
43[#17](/bitcoin-core-multiprocess/17/) std::__shared_ptr<node::(anonymous namespace)::NotificationsProxy, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=<optimized out>)
44    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1524
45[#18](/bitcoin-core-multiprocess/18/) std::__shared_ptr<node::(anonymous namespace)::NotificationsProxy, (__gnu_cxx::_Lock_policy)2>::reset (this=0x7ffed4005a50)
46    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1642
47[#19](/bitcoin-core-multiprocess/19/) node::(anonymous namespace)::NotificationsHandlerImpl::disconnect (this=0x7ffed4005a40) at ./node/interfaces.cpp:496
48[#20](/bitcoin-core-multiprocess/20/) 0x0000555555755e47 in node::(anonymous namespace)::NotificationsHandlerImpl::~NotificationsHandlerImpl (this=0x7ffed4005a40) at ./node/interfaces.cpp:491
49[#21](/bitcoin-core-multiprocess/21/) node::(anonymous namespace)::NotificationsHandlerImpl::~NotificationsHandlerImpl (this=0x28769) at ./node/interfaces.cpp:491
50[#22](/bitcoin-core-multiprocess/22/) 0x0000555555b49cb7 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x7ffed4004d00)
51    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:346
52[#23](/bitcoin-core-multiprocess/23/) std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=<optimized out>)
53    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1071
54[#24](/bitcoin-core-multiprocess/24/) std::__shared_ptr<interfaces::Handler, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=<optimized out>)
55    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1524
56[#25](/bitcoin-core-multiprocess/25/) std::__shared_ptr<interfaces::Handler, (__gnu_cxx::_Lock_policy)2>::reset (this=0x7fffe801c3e0)
57    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/shared_ptr_base.h:1642
58[#26](/bitcoin-core-multiprocess/26/) mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}::operator()() (this=0x7fffe801c3e0)
59    at ./ipc/libmultiprocess/include/mp/proxy-io.h:514
60[#27](/bitcoin-core-multiprocess/27/) std::__invoke_impl<void, mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}&>(std::__invoke_other, mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}&) (__f=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61
61[#28](/bitcoin-core-multiprocess/28/) std::__invoke_r<void, mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}&>(mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}&) (__fn=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:111
62[#29](/bitcoin-core-multiprocess/29/) std::_Function_handler<void (), mp::ProxyServerBase<ipc::capnp::messages::Handler, interfaces::Handler>::~ProxyServerBase()::{lambda()#1}>::_M_invoke(std::_Any_data const&) (
63    __functor=...) at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:290
64[#30](/bitcoin-core-multiprocess/30/) 0x0000555555f41979 in std::function<void ()>::operator()() const (this=0x7ffed2ffca70) at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_function.h:591
65[#31](/bitcoin-core-multiprocess/31/) mp::Unlock<mp::Lock, std::function<void ()> const&>(mp::Lock&, std::function<void ()> const&) (lock=..., callback=...) at ./ipc/libmultiprocess/include/mp/util.h:209
66[#32](/bitcoin-core-multiprocess/32/) 0x0000555555f3f56f in mp::EventLoop::startAsyncThread()::$_0::operator()() const (this=<optimized out>) at ./ipc/libmultiprocess/src/mp/proxy.cpp:298
67[#33](/bitcoin-core-multiprocess/33/) std::__invoke_impl<void, mp::EventLoop::startAsyncThread()::$_0>(std::__invoke_other, mp::EventLoop::startAsyncThread()::$_0&&) (__f=...)
68    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:61
69[#34](/bitcoin-core-multiprocess/34/) std::__invoke<mp::EventLoop::startAsyncThread()::$_0>(mp::EventLoop::startAsyncThread()::$_0&&) (__fn=...)
70    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/invoke.h:96
71[#35](/bitcoin-core-multiprocess/35/) std::thread::_Invoker<std::tuple<mp::EventLoop::startAsyncThread()::$_0> >::_M_invoke<0ul>(std::_Index_tuple<0ul>) (this=<optimized out>)
72    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_thread.h:292
73[#36](/bitcoin-core-multiprocess/36/) std::thread::_Invoker<std::tuple<mp::EventLoop::startAsyncThread()::$_0> >::operator()() (this=<optimized out>)
74    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_thread.h:299
75[#37](/bitcoin-core-multiprocess/37/) std::thread::_State_impl<std::thread::_Invoker<std::tuple<mp::EventLoop::startAsyncThread()::$_0> > >::_M_run() (this=<optimized out>)
76    at /usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/std_thread.h:244
77[#38](/bitcoin-core-multiprocess/38/) 0x00007ffff76ecdb4 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
78[#39](/bitcoin-core-multiprocess/39/) 0x00007ffff729caa4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:447
79[#40](/bitcoin-core-multiprocess/40/) 0x00007ffff7329c6c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
ryanofsky commented at 2:13 pm on September 29, 2025: collaborator

Seems that an exception is being thrown from the ~ProxyServerBase() destructor, causing std::terminate to be called. I’ll need to look into stack trace more to try to figure out the how this is happening. Hopefully it should not be too hard to write a unit test to reproduce it.
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