empiredan opened a new issue, #1817:
URL: https://github.com/apache/incubator-pegasus/issues/1817
It is found that after sending http request "/meta/cluster" to any standby
meta server (for example, to sending request to a local meta server with port
34601, the command would be `curl -v 127.0.0.1:34601/meta/cluster`), it would
exits abnormally with core dump. Running gdb over the core dump file would
output following messages:
```
root@d04a6b37202f:/data/code/incubator-pegasus/onebox/meta1# gdb
/data/code/incubator-pegasus/onebox/meta1/pegasus_server 'core.1703160155.
meta.default.4.149'
Core was generated by
`/data/code/incubator-pegasus/onebox/meta1/pegasus_server config.ini -app_list
m'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f686b5fb653 in
dsn::replication::meta_http_service::get_cluster_info_handler
(this=0x55da218de340, req=..., resp=...) at
/data/code/incubator-pegasus/src/meta/meta_http_service.cpp:487
487
_service->_balancer->get_balance_operation_count(balance_operation_type));
[Current thread is 1 (Thread 0x7f685f73a640 (LWP 423))]
Installing openjdk unwinder
Traceback (most recent call last):
File
"/usr/share/gdb/auto-load/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so-gdb.py",
line 52, in <module>
class Types(object):
File
"/usr/share/gdb/auto-load/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so-gdb.py",
line 66, in Types
nmethodp_t = gdb.lookup_type('nmethod').pointer()
gdb.error: No type named nmethod.
(gdb) bt
#0 0x00007f686b5fb653 in
dsn::replication::meta_http_service::get_cluster_info_handler
(this=0x55da218de340, req=..., resp=...) at
/data/code/incubator-pegasus/src/meta/meta_http_service.cpp:487
#1 0x00007f686c1a89c7 in std::function<void (dsn::http_request const&,
dsn::http_response&)>::operator()(dsn::http_request const&,
dsn::http_response&) const (__args#1=..., __args#0=..., this=0x55da21f73660) at
/usr/include/c++/11/bits/std_function.h:590
#2 dsn::http_server::serve (this=<optimized out>, msg=0x55da220648f0) at
/data/code/incubator-pegasus/src/http/http_server.cpp:152
#3 0x00007f686c205d6b in std::function<void
(dsn::message_ex*)>::operator()(dsn::message_ex*) const (__args#0=<optimized
out>, this=0x55da219387d0) at /usr/include/c++/11/bits/std_function.h:586
#4 dsn::rpc_request_task::exec (this=0x55da21938700) at
/data/code/incubator-pegasus/src/runtime/task/task.h:435
#5 0x00007f686c2083cf in dsn::task::exec_internal (this=0x55da21938700) at
/data/code/incubator-pegasus/src/runtime/task/task.cpp:173
#6 0x00007f686c22285a in dsn::task_worker::loop (this=0x55da21f44f00) at
/data/code/incubator-pegasus/src/runtime/task/task_worker.cpp:245
#7 0x00007f686a031253 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
#8 0x00007f6869cbaac3 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#9 0x00007f6869d4bbf4 in clone () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) f 1
#1 0x00007f686c1a89c7 in std::function<void (dsn::http_request const&,
dsn::http_response&)>::operator()(dsn::http_request const&,
dsn::http_response&) const (__args#1=..., __args#0=..., this=0x55da21f73660) at
/usr/include/c++/11/bits/std_function.h:590
590 return _M_invoker(_M_functor,
std::forward<_ArgTypes>(__args)...);
(gdb) f 0
#0 0x00007f686b5fb653 in
dsn::replication::meta_http_service::get_cluster_info_handler
(this=0x55da218de340, req=..., resp=...) at
/data/code/incubator-pegasus/src/meta/meta_http_service.cpp:487
487
_service->_balancer->get_balance_operation_count(balance_operation_type));
(gdb) list
482
_meta_function_level_VALUES_TO_NAMES.find(_service->get_function_level())->second
+ 3);
483 std::vector<std::string> balance_operation_type;
484 balance_operation_type.emplace_back("detail");
485 tp.add_row_name_and_data(
486 "balance_operation_count",
487
_service->_balancer->get_balance_operation_count(balance_operation_type));
488 double primary_stddev, total_stddev;
489 _service->_state->get_cluster_balance_score(primary_stddev,
total_stddev);
490 tp.add_row_name_and_data("primary_replica_count_stddev",
primary_stddev);
491 tp.add_row_name_and_data("total_replica_count_stddev",
total_stddev);
(gdb) p _service
$1 = (dsn::replication::meta_service *) 0x55da21aaa000
(gdb) p _service->_balancer
$2 = std::shared_ptr<dsn::replication::server_load_balancer> (empty) =
{get() = 0x0}
```
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