老年人程式設計系列 - 999種coredump的方法

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SIGSEGV

程序試圖寫不能寫的記憶體

char *p = 0;
*p = 1;           

segfault at 0 ip 0000000000400541 sp 00007ffc4eba93e0 error 6 in a.out[400000+1000]

程序試圖讀不能讀的記憶體

char *p = 0;
char c = *p;           

segfault at 0 ip 00000000004004fd sp 00007ffe321ef0f0 error 4 in a.out[400000+1000]

double free

char *p = malloc(128);
free(p);
free(p);           

Error in `./a.out': double free or corruption (fasttop): 0x0000000000a42010

======= Backtrace: =========

/lib64/libc.so.6(+0x81499)[0x7fbe685b9499]

./a.out[0x4005ab]

/lib64/libc.so.6(__libc_start_main+0xf5)[0x7fbe6855a445]

./a.out[0x4004b9]

======= Memory map: ========

00400000-00401000 r-xp 00000000 fd:11 56369896 /mnt/situo.cly/yq/a.out

...

[heap]

7fbe64000000-7fbe64021000 rw-p 00000000 00:00 0

...

Aborted (core dumped)

SIGABRT

abort();           

assert(0);           

SIGFPE

int x = 3 / 0;           

Floating point exception (core dumped)