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<div style='display: inline'> <h1 style='font-family: Malgun Gothic, Consolas; font-size: 20pt; color: #006699; text-align: center; font-weight: bold'>리눅스 환경에서 C/C++ 프로그램이 Segmentation fault 에러가 발생한 경우</h1> <p> 리눅스 환경에 낯설다 보니 ^^ 회사 동료가 빠르게 오류 원인을 파악하는 방법을 알려줬습니다. 우선, (아마도 container 환경이라면 거의 없을 텐데) gdb를 설치하고,<br /> <br /> <pre style='margin: 10px 0px 10px 10px; padding: 10px 0px 10px 10px; background-color: #fbedbb; overflow: auto; font-family: Consolas, Verdana;' > apt-get update && apt-get install -y --no-install-recommends gdb </pre> <br /> gdb를 대상 실행 모듈을 로드하도록 실행한 후, (이 글에서는 dotnet 프로그램으로 가정)<br /> <br /> <pre style='margin: 10px 0px 10px 10px; padding: 10px 0px 10px 10px; background-color: #fbedbb; overflow: auto; font-family: Consolas, Verdana;' > $ <span style='color: blue; font-weight: bold'>gdb dotnet</span> GNU gdb (Debian 7.12-6) 7.12.0.20161007-git Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from dotnet...(no debugging symbols found)...done. </pre> <br /> 명령행 인자가 있다면 함께 명시하면서 "r"로 실행을 시키면,<br /> <br /> <pre style='margin: 10px 0px 10px 10px; padding: 10px 0px 10px 10px; background-color: #fbedbb; overflow: auto; font-family: Consolas, Verdana;' > (gdb) <span style='color: blue; font-weight: bold'>r "razor21_sample.dll"</span> Starting program: /usr/bin/dotnet "razor21_sample.dll" warning: Error disabling address space randomization: Operation not permitted [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [New Thread 0x7fe676029700 (LWP 745)] ...[생략]... [New Thread 0x7fe667fff700 (LWP 790)] Thread 1 "dotnet" received <span style='color: blue; font-weight: bold'>signal SIGSEGV, Segmentation fault.</span> 0x00007f0a363b5c0c in construct<unsigned char, unsigned char const&> () at /usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/ext/new_allocator.h:136 136 /usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/ext/new_allocator.h: No such file or directory. </pre> <br /> Segmentation fault 오류가 발생한 시점에 서게 되고, 이때 bt 명령을 통해 호출 스택을 살필 수 있습니다.<br /> <br /> <pre style='margin: 10px 0px 10px 10px; padding: 10px 0px 10px 10px; background-color: #fbedbb; overflow: auto; font-family: Consolas, Verdana;' > (gdb) <span style='color: blue; font-weight: bold'>bt</span> #0 0x00007fe6740bfc0c in construct<unsigned char, unsigned char const&> () at /usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/ext/new_allocator.h:136 #1 construct<unsigned char, unsigned char const&> () at /usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/alloc_traits.h:475 #2 push_back () at /usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/stl_vector.h:1079 #3 TestSegFaultMethod () at /home/testusr/projects/libTest/shared/TestInfo.cpp:2315 #4 0x00007fe6740bf6d8 in TestResolve () at /home/testusr/projects/libTest/shared/TestInfo.cpp:2155 #5 0x00007fe6740e3d4d in TestCall () at /home/testusr/projects/libTest/shared/TestApp.cpp:1391 #6 0x00007fe6740e3439 in TestMethod () at /home/testusr/projects/libTest/shared/TestApp.cpp:1273 #7 0x00007fe6740e2e49 in TestJIT () at /home/testusr/projects/libTest/shared/TestApp.cpp:1178 #8 0x00007fe677132f3c in EEToProfInterfaceImpl::TestJIT(unsigned long, int) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #9 0x00007fe67726d222 in MethodDesc::JitCompileCodeLockedEventWrapper(PrepareCodeConfig*, ListLockEntryBase<NativeCodeVersion>*) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #10 0x00007fe67726cbb0 in MethodDesc::JitCompileCode(PrepareCodeConfig*) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #11 0x00007fe67726c937 in MethodDesc::PrepareILBasedCode(PrepareCodeConfig*) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #12 0x00007fe67726ef15 in MethodDesc::DoPrestub(MethodTable*) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #13 0x00007fe67726e844 in PreStubWorker () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #14 0x00007fe6771f0bc4 in ThePreStub () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #15 0x00007fe6771efedf in CallDescrWorkerInternal () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #16 0x00007fe67711060c in MethodDescCallSite::CallTargetWorker(unsigned long const*, unsigned long*, int) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #17 0x00007fe677211076 in RunMain(MethodDesc*, short, int*, PtrArray**) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #18 0x00007fe677211315 in Assembly::ExecuteMainMethod(PtrArray**, int) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #19 0x00007fe677059ec2 in CorHost2::ExecuteAssembly(unsigned int, char16_t const*, int, char16_t const**, unsigned int*) () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so #20 0x00007fe677034fe4 in coreclr_execute_assembly () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libcoreclr.so ---Type <return> to continue, or q <return> to quit--- #21 0x00007fe67780c84d in ?? () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libhostpolicy.so #22 0x00007fe6777ff2cd in ?? () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libhostpolicy.so #23 0x00007fe6777ffb1c in corehost_main () from /usr/share/dotnet/shared/Microsoft.NETCore.App/2.1.17/libhostpolicy.so #24 0x00007fe677ab29cf in ?? () from /usr/share/dotnet/host/fxr/2.1.17/libhostfxr.so #25 0x00007fe677abdf8c in ?? () from /usr/share/dotnet/host/fxr/2.1.17/libhostfxr.so #26 0x00007fe677abf0e5 in ?? () from /usr/share/dotnet/host/fxr/2.1.17/libhostfxr.so #27 0x00007fe677abe659 in ?? () from /usr/share/dotnet/host/fxr/2.1.17/libhostfxr.so #28 0x00007fe677ab2c1c in hostfxr_main_startupinfo () from /usr/share/dotnet/host/fxr/2.1.17/libhostfxr.so #29 0x000000000040ac74 in ?? () #30 0x000000000040af05 in ?? () #31 0x00007fe677d232e1 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6 #32 0x0000000000408a54 in _start () (gdb) </pre> <br /> 이 정도만 확인할 수 있어도, 어떻게 원인을 탐색 및 해결해야 할지 큰 도움이 됩니다. ^^<br /> </p><br /> <br /><hr /><span style='color: Maroon'>[이 글에 대해서 여러분들과 의견을 공유하고 싶습니다. 틀리거나 미흡한 부분 또는 의문 사항이 있으시면 언제든 댓글 남겨주십시오.]</span> </div>
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