Question

我在Population.cpp中有一个2D动态整数链表的声明：

sectionProf = new int*[section_count]; //list of professor for each section declaration

在Population.h中定义为：

int ** sectionProf; //list of professor for each section

然后从文件中填充，再次在Population.cpp中填写，稍后：

sectionProf[section] = new int[professors + 1];
sectionProf[section][0] = professors;
if (professors > 0) {
    for (int x = 1; x < professors + 1; ++x) {
        sectionProf[section][x] = stoi(tokenizedVersion[x + 1]);
    }
}

然后，在析构函数中，我按如下方式销毁它：

if(sectionProf){
    for(int i = 0; i < section_count; ++i){
        delete [] sectionProf[i];
    }
    delete [] sectionProf;
}

然而，执行时，我不断收到以下错误：

*检测到glibc * ./research_scheduling_backend：损坏的双链表：0x00000000020b78c0 ***

这是gdb回溯（＃17指的是＆＃39; delete [] sectionProf＆＃39;行）：

#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:93
#1  0x00007ffff7085f61 in _L_lock_10611 () at malloc.c:5249
#2  0x00007ffff7083c87 in __GI___libc_malloc (bytes=140737341265696) at malloc.c:2921
#3  0x00007ffff7de7900 in _dl_map_object_deps (map=0x7ffff7fdd4e0, preloads=<optimized out>, npreloads=<optimized out>, trace_mode=0, open_mode=-2147483648) at dl-deps.c:517
#4  0x00007ffff7ded8a9 in dl_open_worker (a=0x7fffffffbb00) at dl-open.c:262
#5  0x00007ffff7de9176 in _dl_catch_error (objname=0x7fffffffbb48, errstring=0x7fffffffbb50, mallocedp=0x7fffffffbb5f, operate=0x7ffff7ded700 <dl_open_worker>, args=0x7fffffffbb00) at dl-error.c:178
#6  0x00007ffff7ded31a in _dl_open (file=0x7ffff717a858 "libgcc_s.so.1", mode=-2147483647, caller_dlopen=0x7ffff710bea5, nsid=-2, argc=3, argv=<optimized out>, env=0x7fffffffeac8) at dl-open.c:639
#7  0x00007ffff7131bb2 in do_dlopen (ptr=0x7fffffffbd00) at dl-libc.c:89
#8  0x00007ffff7de9176 in _dl_catch_error (objname=0x7fffffffbd30, errstring=0x7fffffffbd20, mallocedp=0x7fffffffbd3f, operate=0x7ffff7131b70 <do_dlopen>, args=0x7fffffffbd00) at dl-error.c:178
#9  0x00007ffff7131c74 in dlerror_run (args=0x7fffffffbd00, operate=0x7ffff7131b70 <do_dlopen>) at dl-libc.c:48
#10 __GI___libc_dlopen_mode (name=<optimized out>, mode=<optimized out>) at dl-libc.c:165
#11 0x00007ffff710bea5 in init () at ../sysdeps/x86_64/../ia64/backtrace.c:53
#12 0x00007ffff6df1400 in pthread_once () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_once.S:104
#13 0x00007ffff710bfc4 in __GI___backtrace (array=<optimized out>, size=64) at ../sysdeps/x86_64/../ia64/backtrace.c:104
#14 0x00007ffff707505f in __libc_message (do_abort=2, fmt=0x7ffff717f560 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:180
#15 0x00007ffff707f846 in malloc_printerr (action=3, str=0x7ffff717be4c "corrupted double-linked list", ptr=<optimized out>) at malloc.c:5047
#16 0x00007ffff7080b1b in _int_free (av=0x7ffff73b9720, p=0x627dd0, have_lock=0) at malloc.c:4125
#17 0x0000000000404b7e in Population::~Population (this=0x7fffffffc910, __in_chrg=<optimized out>) at Population.cpp:91
#18 0x0000000000403919 in main (argc=3, argv=0x7fffffffeaa8) at Scheduler.cpp:101

代码中绝对没有地方修改过sectionProf数组。它仅用于检查值。有人可以告诉我为什么我可能会收到此错误吗？我看了很多关于glibc双链表错误的地方，我明白这是因为在某种程度上我在某种程度上破坏了符号表（？）......

Answer 1

对于任何解决此问题的人来说，这是我的具体问题出了什么问题。当我生成数组时，我正在读取超出范围（section_count）的节索引的垃圾值。也就是说，在for循环中，

sectionProf[section] = new int[professors + 1];
sectionProf[section][0] = professors;
if (professors > 0) {
    for (int x = 1; x < professors + 1; ++x) {
        sectionProf[section][x] = stoi(tokenizedVersion[x + 1]);
    }
}

section的值不在0和section_count的范围内，即删除循环中使用的索引。因此，为什么我造成了记忆的腐败。

课程：检查输入文件中生成的 PEBKAC 错误。

C ++ glibc检测到损坏的双链表错误C ++

1 个答案: