middaywords opened a new issue, #2936:
URL: https://github.com/apache/brpc/issues/2936
**Describe the bug (描述bug)**
server:
```
➜ echo_c++ git:(master) ./echo_server
I0404 03:39:09.932712 141904 0 src/brpc/server.cpp:1241]
Server[example::EchoServiceImpl] is serving on port=8000.
I0404 03:39:09.933092 141904 0 src/brpc/server.cpp:1244] Check out
http://noble:8000 in web browser.
```
client:
```
➜ echo_c++ git:(master) ./echo_client
[1] 141961 segmentation fault (core dumped) ./echo_client
```
**To Reproduce (复现方法)**
```bash
$ ./config_brpc.sh --headers=/usr/include --libs=/usr/lib --cxx=clang++
--cc=clang
$ cd example/echo_c++
$ make
$ ./echo_server &
$ ./echo_client
```
gdb 调试发现 _app_connect memory addr cannot access.
```
➜ echo_c++ git:(master) gdb ./echo_client
...
Reading symbols from ./echo_client...
(gdb) r
Starting program: /home/kanxu/proj/brpc/example/echo_c++/echo_client
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
[New Thread 0xfffff740ee40 (LWP 142238)]
[New Thread 0xfffff6a0ee40 (LWP 142239)]
[New Thread 0xfffff600ee40 (LWP 142240)]
[New Thread 0xfffff560ee40 (LWP 142241)]
[New Thread 0xfffff4c0ee40 (LWP 142242)]
[New Thread 0xffffefe0ee40 (LWP 142243)]
[New Thread 0xffffef40ee40 (LWP 142244)]
[New Thread 0xffffeea0ee40 (LWP 142245)]
[New Thread 0xffffee00ee40 (LWP 142246)]
[New Thread 0xffffed60ee40 (LWP 142247)]
[New Thread 0xffffecc0ee40 (LWP 142248)]
Thread 10 "brpc_wkr:0-6" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xffffee00ee40 (LWP 142246)]
brpc::Socket::CheckConnectedAndKeepWrite (fd=<optimized out>, err=<optimized
out>, err@entry=0, data=0xaaaaac08cab0) at src/brpc/socket.cpp:1571
1571 s->_app_connect->StartConnect(req->get_socket(),
(gdb) bt
#0 brpc::Socket::CheckConnectedAndKeepWrite (fd=<optimized out>,
err=<optimized out>, err@entry=0, data=0xaaaaac08cab0) at
src/brpc/socket.cpp:1571
#1 0x0000aaaaaacc5d98 in brpc::Socket::KeepWriteIfConnected (fd=<optimized
out>, err=0, data=<optimized out>) at src/brpc/socket.cpp:1554
#2 0x0000aaaaaacc5ee8 in brpc::Socket::HandleEpollOutRequest
(this=0xaaaaac04f8b0, error_code=0, req=0xaaaaabe184b0) at
src/brpc/socket.cpp:1490
#3 brpc::Socket::OnOutputEvent (user_data=<optimized out>) at
src/brpc/socket.cpp:1456
#4 0x0000aaaaaac8e080 in brpc::IOEventData::CallOutputEventCallback
(this=0xaaaaac022220, events=4, thread_attr=...)
at ./src/brpc/event_dispatcher.h:74
#5 brpc::EventDispatcher::OnEvent<false> (event_data_id=<optimized out>,
events=4, thread_attr=...) at ./src/brpc/event_dispatcher.h:158
#6 brpc::EventDispatcher::CallOutputEventCallback (event_data_id=<optimized
out>, events=4, thread_attr=...) at ./src/brpc/event_dispatcher.h:170
#7 brpc::EventDispatcher::Run (this=0xaaaaabe1efc8) at
./src/brpc/event_dispatcher_epoll.cpp:232
#8 0x0000aaaaaac8dd00 in brpc::EventDispatcher::RunThis
(arg=0x631eba43eaea2) at ./src/brpc/event_dispatcher_epoll.cpp:189
#9 0x0000aaaaaac77d44 in bthread::TaskGroup::task_runner
(skip_remained=<optimized out>) at src/bthread/task_group.cpp:305
#10 0x0000aaaaaadbd5b0 in bthread_make_fcontext ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) p s->_app_connect
$1 = <error reading variable: Cannot access memory at address 0x1f4000000008>
(gdb)
```
**Expected behavior (期望行为)**
```
➜ echo_c++ git:(master) ✗ ./echo_client
I0404 03:28:27.590878 135960 0 client.cpp:78] Received response from
0.0.0.0:8000 to 127.0.0.1:43450: hello world (attached=) latency=5523us
I0404 03:28:28.591892 135960 0 client.cpp:78] Received response from
0.0.0.0:8000 to 127.0.0.1:43450: hello world (attached=) latency=767us
```
**Versions (各种版本)**
OS: 6.10.0
Compiler: clang++
```
➜ echo_c++ git:(master) clang++ -v
Ubuntu clang version 18.1.3 (1ubuntu1)
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/aarch64-linux-gnu/13
Selected GCC installation: /usr/bin/../lib/gcc/aarch64-linux-gnu/13
Candidate multilib: .;@m64
Selected multilib: .;@m64
```
brpc: 3d16b5bc08c967103c9640e9aef24a63e775dd24 (latest)
protobuf: 3.21.12
**Additional context/screenshots (更多上下文/截图)**
用 g++/gcc 编译可以正常运行
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