Question

我在我的程序上运行Valgrind。它向我展示了两个错误，但只提到了针对它们的地址而不是实际代码，即使在调试版本中也是如此。

你能来吗？帮助我理解它说的内容以及如何达到错误的代码行？

输出

==23002== Memcheck, a memory error detector.  
==23002== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.  
==23002== Using LibVEX rev 1575, a library for dynamic binary translation.  
==23002== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP.  
==23002== Using valgrind-3.1.1, a dynamic binary instrumentation framework.  
==23002== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.  
==23002== For more details, rerun with: -v  
==23002==  
==23002== Invalid read of size 4  
==23002== at 0x8AAE6D: open_path (in /lib/ld-2.3.4.so)  
==23002== by 0x8AB68B: _dl_map_object (in /lib/ld-2.3.4.so)  
==23002== by 0x8AF307: openaux (in /lib/ld-2.3.4.so)  
==23002== by 0x8B066D: _dl_catch_error (in /lib/ld-2.3.4.so)  
==23002== by 0x8AF5A9: _dl_map_object_deps (in /lib/ld-2.3.4.so)  
==23002== by 0x8A6459: dl_main (in /lib/ld-2.3.4.so)  
==23002== by 0x8B3DF4: _dl_sysdep_start (in /lib/ld-2.3.4.so)  
==23002== by 0x8A53EF: _dl_start (in /lib/ld-2.3.4.so)  
==23002== by 0x8A47C6: (within /lib/ld-2.3.4.so)  
==23002== Address 0x2F8BBBF8 is not stack'd, malloc'd or (recently) free'd  
==23002==  
==23002== Process terminating with default action of signal 11 (SIGSEGV)  
==23002== Access not within mapped region at address 0x2F8BBBF8  
==23002== at 0x8AAE6D: open_path (in /lib/ld-2.3.4.so)  
==23002== by 0x8AB68B: _dl_map_object (in /lib/ld-2.3.4.so)  
==23002== by 0x8AF307: openaux (in /lib/ld-2.3.4.so)  
==23002== by 0x8B066D: _dl_catch_error (in /lib/ld-2.3.4.so)  
==23002== by 0x8AF5A9: _dl_map_object_deps (in /lib/ld-2.3.4.so)  
==23002== by 0x8A6459: dl_main (in /lib/ld-2.3.4.so)  
==23002== by 0x8B3DF4: _dl_sysdep_start (in /lib/ld-2.3.4.so)  
==23002== by 0x8A53EF: _dl_start (in /lib/ld-2.3.4.so)  
==23002== by 0x8A47C6: (within /lib/ld-2.3.4.so)  
==23002==  
==23002== Jump to the invalid address stated on the next line  
==23002== at 0x246: ???  
==23002== Address 0x246 is not stack'd, malloc'd or (recently) free'd  
==23002==  
==23002== Process terminating with default action of signal 11 (SIGSEGV)  
==23002== Bad permissions for mapped region at address 0x246  
==23002== at 0x246: ???  
==23002==  
==23002== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)  
==23002== malloc/free: in use at exit: 0 bytes in 0 blocks.  
==23002== malloc/free: 0 allocs, 0 frees, 0 bytes allocated.  
==23002== For counts of detected errors, rerun with: -v  
==23002== All heap blocks were freed -- no leaks are possible.

Answer 1

那个地址看起来很虚伪。忘记valgrind，启动gdb以找到你的程序是segfaulting的位置。

Answer 2

没有调试信息，因为指示的代码位于ld-2.3.4.so库中（这是动态链接器）。

在我看来，您的可执行文件与损坏的动态库文件相关联（或者正在尝试通过该机制加载不是动态库的文件）。

Valgrind输出显示地址而不是错误代码

2 个答案: