daming6 commented on issue #3288:
URL: https://github.com/apache/brpc/issues/3288#issuecomment-4417134632
> 会不会是rdma_performance bvar全局变量生命周期的问题？能用 gdb 看看堆栈吗？
这个偶发问题复现概率有点低，目前手动gdb能看不core dumped时调用make_shared()代码中有3处，具体gdb打断点调试如下：
(gdb) c
Continuing.
[New Thread 0x4000037cfdc0 (LWP 2118472)]
Thread 1 "client" hit Breakpoint 1.5,
std::make_shared<bvar::detail::AgentCombiner<bvar::Stat, unsigned long,
bvar::IntRecorder::AddToStat>>() () at
/usr/include/c++/12/bits/shared_ptr.h:1010
1010 std::forward<_Args>(__args)...);
(gdb) bt
#0 std::make_shared<bvar::detail::AgentCombiner<bvar::Stat, unsigned long,
bvar::IntRecorder::AddToStat>>() () at
/usr/include/c++/12/bits/shared_ptr.h:1010
#1 bvar::IntRecorder::IntRecorder (this=0x431090 <g_latency_recorder>) at
./src/bvar/recorder.h:127
#2 bvar::detail::LatencyRecorderBase::LatencyRecorderBase
(this=this@entry=0x431090 <g_latency_recorder>,
window_size=window_size@entry=-1) at src/bvar/latency_recorder.cpp:170
#3 0x0000000000414c5c in bvar::LatencyRecorder::LatencyRecorder
(this=0x431090 <g_latency_recorder>, prefix=...) at
../../output/include/bvar/latency_recorder.h:80
#4 0x000000000040a490 in __static_initialization_and_destruction_0
(__initialize_p=1, __priority=65535) at client.cpp:50
#5 _GLOBAL__sub_I_client.cpp(void) () at client.cpp:312
#6 0x0000400002f27828 in __libc_start_main () from /usr/lib64/libc.so.6
#7 0x000000000040a730 in _start ()
(gdb) c
Continuing.
Thread 1 "client" hit Breakpoint 1.6,
std::make_shared<bvar::detail::AgentCombiner<long, long,
bvar::detail::MaxTo<long> >, long&, long&, bvar::detail::MaxTo<long> const&> ()
at /usr/include/c++/12/bits/shared_ptr.h:1010
1010 std::forward<_Args>(__args)...);
(gdb) bt
#0 std::make_shared<bvar::detail::AgentCombiner<long, long,
bvar::detail::MaxTo<long> >, long&, long&, bvar::detail::MaxTo<long> const&> ()
at /usr/include/c++/12/bits/shared_ptr.h:1010
#1 bvar::Reducer<long, bvar::detail::MaxTo<long>,
bvar::detail::VoidOp>::Reducer (inv_op=..., op=..., identity=0, this=0x4310f0
<g_latency_recorder+96>) at ./src/bvar/reducer.h:204
#2 bvar::Maxer<long, void>::Maxer (default_value=0, this=0x4310f0
<g_latency_recorder+96>) at ./src/bvar/reducer.h:412
#3 bvar::detail::LatencyRecorderBase::LatencyRecorderBase
(this=this@entry=0x431090 <g_latency_recorder>,
window_size=window_size@entry=-1) at src/bvar/latency_recorder.cpp:158
#4 0x0000000000414c5c in bvar::LatencyRecorder::LatencyRecorder
(this=0x431090 <g_latency_recorder>, prefix=...) at
../../output/include/bvar/latency_recorder.h:80
#5 0x000000000040a490 in __static_initialization_and_destruction_0
(__initialize_p=1, __priority=65535) at client.cpp:50
#6 _GLOBAL__sub_I_client.cpp(void) () at client.cpp:312
#7 0x0000400002f27828 in __libc_start_main () from /usr/lib64/libc.so.6
#8 0x000000000040a730 in _start ()
(gdb) c
Continuing.
Thread 1 "client" hit Breakpoint 1.7,
std::make_shared<bvar::detail::AgentCombiner<bvar::detail::PercentileSamples<254ul>,
bvar::detail::PercentileSamples<30ul>,
bvar::detail::detail::AddPercentileSamples>>() ()
at /usr/include/c++/12/bits/shared_ptr.h:1010
1010 std::forward<_Args>(__args)...);
(gdb) bt
#0
std::make_shared<bvar::detail::AgentCombiner<bvar::detail::PercentileSamples<254ul>,
bvar::detail::PercentileSamples<30ul>,
bvar::detail::detail::AddPercentileSamples>>() ()
at /usr/include/c++/12/bits/shared_ptr.h:1010
#1 bvar::detail::Percentile::Percentile (this=this@entry=0x431140
<g_latency_recorder+176>) at src/bvar/detail/percentile.cpp:89
#2 0x000040000063d3dc in
bvar::detail::LatencyRecorderBase::LatencyRecorderBase
(this=this@entry=0x431090 <g_latency_recorder>,
window_size=window_size@entry=-1) at src/bvar/latency_recorder.cpp:170
#3 0x0000000000414c5c in bvar::LatencyRecorder::LatencyRecorder
(this=0x431090 <g_latency_recorder>, prefix=...) at
../../output/include/bvar/latency_recorder.h:80
#4 0x000000000040a490 in __static_initialization_and_destruction_0
(__initialize_p=1, __priority=65535) at client.cpp:50
#5 _GLOBAL__sub_I_client.cpp(void) () at client.cpp:312
#6 0x0000400002f27828 in __libc_start_main () from /usr/lib64/libc.so.6
#7 0x000000000040a730 in _start ()
然后看代码Reducer对象/IntRecorder对象/Percentile对象对应文件中都有operator<<函数，operator<<函数调用_combiner->get_or_create_tls_agent()
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