跟蹤追蹤錯誤

Question

我在輸出中得到了這個。該程序仍然運行並正常結束，但我想追查錯誤。有人可以告訴我如何使用這些數據來追蹤堆棧或追查什麼導致錯誤。我使用edb和gdb來運行C/C++代碼。這裏的輸出：

*** glibc detected *** /home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos: free(): invalid pointer: 0x08061790 *** 
======= Backtrace: ========= 
/lib/libc.so.6[0xf74ac5fb] 
/lib/libc.so.6[0xf74aded4] 
/lib/libc.so.6(cfree+0x6d)[0xf74b10cd] 
/usr/lib/libstdc++.so.6(_ZdlPv+0x21)[0xf769d851] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8049a99] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x80498a7] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8049799] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x804a139] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8050486] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x804aeba] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x804c042] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x804ecad] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8050e65] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8052829] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x80512ce] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x804ff91] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x80495e4] 
/lib/libc.so.6(__libc_start_main+0xfe)[0xf7455ace] 
/home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos[0x8049481] 
======= Memory map: ======== 
08048000-08059000 r-xp 00000000 00:15 24682418       /home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos 
08059000-0805a000 r-xp 00010000 00:15 24682418       /home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos 
0805a000-0805b000 rwxp 00011000 00:15 24682418       /home/f85/njvanbal/workspace/nachos2_v2/userprog/nachos 
0805b000-0807c000 rwxp 00000000 00:00 0         [heap] 
f7300000-f00 rwxp 00000000 00:00 0 
f00-f7400000 ---p 00000000 00:00 0 
f743d000-f743f000 rwxp 00000000 00:00 0 
f743f000-f7598000 r-xp 00000000 08:01 913457        /lib/libc-2.10.1.so 
f7598000-f7599000 ---p 00159000 08:01 913457        /lib/libc-2.10.1.so 
f7599000-f759b000 r-xp 00159000 08:01 913457        /lib/libc-2.10.1.so 
f759b000-f759c000 rwxp 0015b000 08:01 913457        /lib/libc-2.10.1.so 
f759c000-f759f000 rwxp 00000000 00:00 0 
f759f000-f75bc000 r-xp 00000000 08:01 912324        /lib/libgcc_s.so.1 
f75bc000-f75bd000 r-xp 0001c000 08:01 912324        /lib/libgcc_s.so.1 
f75bd000-f75be000 rwxp 0001d000 08:01 912324        /lib/libgcc_s.so.1 
f75be000-f75e5000 r-xp 00000000 08:01 912355        /lib/libm-2.10.1.so 
f75e5000-f75e6000 r-xp 00027000 08:01 912355        /lib/libm-2.10.1.so 
f75e6000-f75e7000 rwxp 00028000 08:01 912355        /lib/libm-2.10.1.so 
f75e7000-f76cb000 r-xp 00000000 08:01 1057029       /usr/lib/libstdc++.so.6.0.12 
f76cb000-f76cf000 r-xp 000e4000 08:01 1057029       /usr/lib/libstdc++.so.6.0.12 
f76cf000-f76d0000 rwxp 000e8000 08:01 1057029       /usr/lib/libstdc++.so.6.0.12 
f76d0000-f76d7000 rwxp 00000000 00:00 0 
f7731000-f7733000 rwxp 00000000 00:00 0 
f7733000-f7751000 r-xp 00000000 08:01 913452        /lib/ld-2.10.1.so 
f7751000-f7752000 r-xp 0001d000 08:01 913452        /lib/ld-2.10.1.so 
f7752000-f7753000 rwxp 0001e000 08:01 913452        /lib/ld-2.10.1.so 
ffdac000-ffdc2000 rwxp 00000000 00:00 0         [stack] 
ffffe000-fffff000 r-xp 00000000 00:00 0  

         [vdso] 

Answer 1

這聽起來像你試圖釋放你不擁有的記憶。我建議在valgrind下運行你的程序。

http://valgrind.org/docs/manual/quick-start.html

作爲邊評論，這樣的錯誤通常來自在C做明確的內存管理++。你通常不應該在C++中「手動」釋放或刪除內存，而是使用標準容器或智能指針來管理內存。