無法理解核心文件分析的 GDB x 命令輸出

Question

我的程序由於分段錯誤而崩潰，我有核心文件和帶有調試符號的二進制文件。 現在我想弄清楚它到底在哪里崩潰（行號，函數名等），但不幸的是，在運行 x 命令（x/256wa $sp）后，我得到了一些十六進制信息。 我是 gdb 的新手，這里的專家可以幫助我弄清楚我的程序到底在哪里崩潰或那些未識別的地址是什么。 我已經粘貼了我的 x 命令輸出。

0x2bc3b3b8: 0xb 0x0 0x1 0x0
0x2bc3b3c8: 0x378   0x70    0x46    0x6c700
0x2bc3b3d8: 0x7e4c8 0x0 0x370   0x2ae40248
0x2bc3b3e8: 0x2bc3b44c  0xa 0x2bc3c920  0x378
0x2bc3b3f8: 0x0 0x2ad8983c <malloc+252> 0x2b45ee04  0x370
0x2bc3b408: 0x370   0x2bc3b44c  0xa 0x370
0x2bc3b418: 0x9f1f0 0x2b4004a8  0x2b400494  0x2b45ee04
0x2bc3b428: 0x2b45f8f0  0x370   0x6c700 0x16
0x2bc3b438: 0x0 0x0 0x0 0x2
0x2bc3b448: 0x0 0xe 0x17    0x0
0x2bc3b458: 0x0 0x0 0x3e420 0x0
0x2bc3b468: 0x0 0x0 0x2bc3c460  0x152
0x2bc3b478: 0x0 0x2ab738c0  0x7ee543a4  0x2bc3b7b4
0x2bc3b488: 0x2b6c14a0  0x2bc3b728  0x2ad8db10 <strerror+36>    0x2ad8dd34 <strnlen+36>
0x2bc3b498: 0x60000010  0x0 0x0 0x0
0x2bc3b4a8: 0x8 0x0 0x1 0x2b43f5dc
0x2bc3b4b8: 0x0 0x0 0x0 0x2ab962f8 <funlockfile>
0x2bc3b4c8: 0x2bc3b538  0x0 0x0 0x0
0x2bc3b4d8: 0x0 0x0 0x2bc3b574  0x2bc3b55c
0x2bc3b4e8: 0x2b44d2f8  0x0 0x2 0x0
0x2bc3b4f8: 0x0 0x0 0x0 0x2bc3b608
0x2bc3b508: 0x81f18 0x0 0x2bc3b608  0x2b2bf884
0x2bc3b518: 0x81f18 0x697ad 0x56465001  0x120
0x2bc3b528: 0x0 0x0 0x1 0x0
0x2bc3b538: 0x0 0x1 0xf4240 0x0
0x2bc3b548: 0x0 0x0 0x0 0x0
0x2bc3b558: 0x0 0x0 0x0 0xf4240
0x2bc3b568: 0x0 0x0 0x0 0x0
0x2bc3b578: 0x0 0x0 0x0 0x0
0x2bc3b588: 0x0 0x0 0x0 0x0
0x2bc3b598: 0x0 0x0 0x0 0x0
0x2bc3b5a8: 0x0 0xff000000  0x0 0x43e00000
0x2bc3b5b8: 0x0 0x40280000  0x0 0x40200000
0x2bc3b5c8: 0x0 0x40240000  0x0 0x412e8480
0x2bc3b5d8: 0x0 0x3ff00000  0x1 0x0
0x2bc3b5e8: 0x0 0x0 0x0 0x0
0x2bc3b5f8: 0x0 0x0 0x0 0x0
0x2bc3b608: 0x0 0x0 0x0 0x0
0x2bc3b618: 0x0 0x0 0x0 0x0
0x2bc3b628: 0x60000010  0x0 0x40000000  0x8046a268
0x2bc3b638: 0x8ee25e68  0x8aaec 0x0 0x871b0
0x2bc3b648: 0x871b0 0x2b2b7450 <MSGACORE_MIMEParserFeed+8948>   0x2bc3b74c  0x2ae3f000
0x2bc3b658: 0x1 0x2ae40248  0x8aad0 0x0
0x2bc3b668: 0x1fc78 <std::deque<HashMessage, std::allocator<HashMessage> >::_M_destroy_data(std::deque<HashMessage, std::allocator<HashMessage> >::iterator, std::deque<HashMessage, std::allocator<HashMessage> >::iterator, std::allocator<HashMessage> const&)+64>   0x2ae3f000  0x0 0x0
0x2bc3b678: 0x0 0x0 0x0 0x2ae3f000
0x2bc3b688: 0x7 0x2 0x0 0x2ae40250
0x2bc3b698: 0x0 0x0 0x1 0x2ae40248
0x2bc3b6a8: 0x152   0x0 0x1fc78 <std::deque<HashMessage, std::allocator<HashMessage> >::_M_destroy_data(std::deque<HashMessage, std::allocator<HashMessage> >::iterator, std::deque<HashMessage, std::allocator<HashMessage> >::iterator, std::allocator<HashMessage> const&)+64>   0x9e388
0x2bc3b6b8: 0x7 0x2ad8b0ec <calloc+336> 0x2bc3c920  0x0
0x2bc3b6c8: 0x6 0x0 0x698d0 0x698d0
0x2bc3b6d8: 0x2bc3c460  0x152   0x0 0x871b0
0x2bc3b6e8: 0x0 0x2b5e3764 <MSG_SrvExtractMimeInfo+1512>    0x0 0x0

和回溯：

(gdb) where
#0 0x2ad4a6bc in kill () from /opt/xse/xse-cmu-latest-version/usr/local/sdk-imx6/arm-oe-linux-gnueabi/lib/libc‌​.so.6
#1 <signal handler called>
#2 0x2ad8dd34 in strnlen () from /opt/xse/xse-cmu-latest-version/usr/local/sdk-imx6/arm-oe-linux-gnueabi/lib/libc‌​.so.6
#3 0x2ad8db10 in strerror () from /opt/xse/xse-cmu-latest-version/usr/local/sdk-imx6/arm-oe-linux-gnueabi/lib/libc‌​.so.6
#4 0x2bc3b780 in ?? ()
#5 0x2bc3b780 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Answer 1

您的堆棧跟蹤看起來不正常。 但是您可以嘗試使用原始地址獲取更多信息：

addr2line -f -e programName 0x2bc3b3b8
addr2line -f -e programName 0x2bc3b698

等等。

另一種選擇是注冊 SIGSEGV 信號。 就像這里如何在我的 gcc C++ 應用程序崩潰時生成堆棧跟蹤