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SIGSEGV

进程试图写不能写的内存

char *p = 0;
*p = 1;

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

进程试图读不能读的内存

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);

Aborted (core dumped)

SIGFPE

int x = 3 / 0;

Floating point exception (core dumped)