我正在尝试使用backtrace和backtrace_symbols结果打印出我捕获SIGSEGV信号后代码崩溃的位置。我从工作线程中明确地触发了它。我使用选项-rdynamic编译了我的静态链接多线程c ++程序，我希望backtrace_symbols会返回一个堆栈跟踪来告诉我发生崩溃的位置，但是下面的结果不是我所期望的，MyApplicationService不是一个方法，但只是可执行文件的名称，我不明白为什么。
2013-03-07 15:13:18.119986598 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZNK5boost4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS_6system10error_codeEiEclEPS3_S7_i+0x74) [0xcd69fa]
2013-03-07 15:13:18.119988126 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost3_bi5list3INS0_5valueIPN18my_app__service_lib14service_runnerEEENS_3argILi1EEENS7_ILi2EEEEclINS_4_mfi3mf2IvS4_RKNS_6system10error_codeEiEENS0_5list2ISH_RKiEEEEvNS0_4typeIvEERT_RT0_i+0x7c) [0xcd6848]
2013-03-07 15:13:18.119989192 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost3_bi6bind_tIvNS_4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS_6system10error_codeEiEENS0_5list3INS0_5valueIPS5_EENS_3argILi1EEENSF_ILi2EEEEEEclIS7_iEEvRKT_RKT0_+0x4c) [0xcd6690]
2013-03-07 15:13:18.119990120 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio6detail7binder2INS_3_bi6bind_tIvNS_4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS_6system10error_codeEiEENS3_5list3INS3_5valueIPS8_EENS_3argILi1EEENSI_ILi2EEEEEEESA_iEclEv+0x2b) [0xcd6597]
2013-03-07 15:13:18.119991031 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio19asio_handler_invokeINS0_6detail7binder2INS_3_bi6bind_tIvNS_4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS_6system10error_codeEiEENS4_5list3INS4_5valueIPS9_EENS_3argILi1EEENSJ_ILi2EEEEEEESB_iEEEEvT_z+0x62) [0xcd64b0]
2013-03-07 15:13:18.119992105 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN33boost_asio_handler_invoke_helpers6invokeIN5boost4asio6detail7binder2INS1_3_bi6bind_tIvNS1_4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS1_6system10error_codeEiEENS5_5list3INS5_5valueIPSA_EENS1_3argILi1EEENSK_ILi2EEEEEEESC_iEESO_EEvRT_RT0_+0x64) [0xcd636c]
2013-03-07 15:13:18.119993000 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio6detail14signal_handlerINS_3_bi6bind_tIvNS_4_mfi3mf2IvN18my_app__service_lib14service_runnerERKNS_6system10error_codeEiEENS3_5list3INS3_5valueIPS8_EENS_3argILi1EEENSI_ILi2EEEEEEEE11do_completeEPNS1_15task_io_serviceEPNS1_25task_io_service_operationESC_m+0xb9) [0xcd605d]
2013-03-07 15:13:18.119993884 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio6detail25task_io_service_operation8completeERNS1_15task_io_serviceERKNS_6system10error_codeEm+0x32) [0xccceac]
2013-03-07 15:13:18.119994819 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio6detail15task_io_service10do_run_oneERNS1_11scoped_lockINS1_11posix_mutexEEERNS2_11thread_infoERKNS_6system10error_codeE+0x1a1) [0xccf4a5]
2013-03-07 15:13:18.119995795 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio6detail15task_io_service3runERNS_6system10error_codeE+0x137) [0xcceffd]
2013-03-07 15:13:18.119996845 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN5boost4asio10io_service3runEv+0x2f) [0xccf823]
2013-03-07 15:13:18.119997845 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(_ZN18my_app__service_lib14service_runner3runEv+0x97) [0xccbb65]
2013-03-07 15:13:18.119998914 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService(main+0x4cc) [0xcc4608]
2013-03-07 15:13:18.119999767 [7f2279bbe720] INFO service_runner - /lib64/libc.so.6(__libc_start_main+0xfd) [0x3f0f01ecdd]
2013-03-07 15:13:18.120000694 [7f2279bbe720] INFO service_runner - ../Debug/MyApplicationService() [0xcc4059]
这是我用来打印上述结果的代码：
void *trace[16];
char **messages = (char **)NULL;
int i, trace_size = 0;
SERVICE_LOG_INFO << "Receive signal " << sig ;
trace_size = backtrace(trace, 16);
messages = backtrace_symbols(trace, trace_size);
LOG << "[bt] Execution path:" ;
for (i=1; i<trace_size; ++i)
LOG << messages[i];
其他信息：
OS: RHEL 6.3
compiler: gcc 4.4.6
compile option: -I/opt/rh/devtoolset-1.0/root/usr/include -I/opt/rh/devtoolset-1.0/root/usr/include/c++/4.7.0 -I/opt/rh/devtoolset-1.0/root/usr/include/c++/4.7.0/backward -I/opt/rh/devtoolset-1.0/root/usr/include/c++/4.7.0/x86_64-redhat-linux -I/opt/rh/devtoolset-1.0/root/usr/lib/gcc/x86_64-redhat-linux/4.7.0/include -I/opt/boost_1_52_0 -I/opt/tbb41_20121003oss/include -I/opt/libev-4.11/include -I"Myapp/include" -O0 -g3 -rdynamic -Wall -c -fmessage-length=0 -std=c++11 -fno-strict-aliasing -MMD -MP -MF"src/service_runner.d" -MT"src/service_runner.d" -o "src/service_runner.o" "../src/service_runner.cpp"
答案 0 :(得分：1)
编译选项显示-c，因此-rdynamic将传递给编译步骤。您需要确保在链接代码时使用它。检查是否是这种情况。
编辑：布莱恩，你现在在问题中添加了错位符号，所以你现在有效地想问一个不同的问题。请不要这样做。
但是你做了以下事情：你需要解析backtrace_symbols中的每一行以提取受损符号并在其上调用__cxa_demangle。策略是从字符串末尾搜索+，然后再次从(搜索开始括号+。向后搜索的原因是，前面的文件名也可能包含这些字符（不太可能，但可能）。如果您尝试实施它并遇到问题，请打开一个新问题。
答案 1 :(得分：1)
终于把一切都整理好了。
解决方案步骤： 1）在链接器选项中添加-rdynamic。
2）使用此代码来解码受损的字符串:(代码来自此thread）
// skip first stack frame (points here)
for (int i = 0; i < trace_size && messages != NULL; ++i)
{
char *mangled_name = 0, *offset_begin = 0, *offset_end = 0;
// find parantheses and +address offset surrounding mangled name
for (char *p = messages[i]; *p; ++p)
{
if (*p == '(')
{
mangled_name = p;
}
else if (*p == '+')
{
offset_begin = p;
}
else if (*p == ')')
{
offset_end = p;
break;
}
}
// if the line could be processed, attempt to demangle the symbol
if (mangled_name && offset_begin && offset_end &&
mangled_name < offset_begin)
{
*mangled_name++ = '\0';
*offset_begin++ = '\0';
*offset_end++ = '\0';
int status;
char * real_name = abi::__cxa_demangle(mangled_name, 0, 0, &status);
// if demangling is successful, output the demangled function name
if (status == 0)
{
std::cerr << "[bt]: (" << i << ") " << messages[i] << " : "
<< real_name << "+" << offset_begin << offset_end
<< std::endl;
}
// otherwise, output the mangled function name
else
{
std::cerr << "[bt]: (" << i << ") " << messages[i] << " : "
<< mangled_name << "+" << offset_begin << offset_end
<< std::endl;
}
free(real_name);
}
// otherwise, print the whole line
else
{
std::cerr << "[bt]: (" << i << ") " << messages[i] << std::endl;
}
}
std::cerr << std::endl;