常见的几种error:
SIGQUIT 3 Quit from keyboard(ctr+)
SIGILL 4 Illegal Instruction
SIGABRT 6 Abort signal from abort (call abort)
SIGFPE 8 Floating point exception (div 0)
SIGSEGV 11 Invalid memory reference
SIGBUS 7 Bus error
SIGSYS 31 invalid system call
SIGTRAP 5 Trace/breakpoint trap
SIGXCPU 24 CPU time limit exceeded
SIGXFSZ 25 File size limit exceeded
SIGABRT(signal 6)
- new失败, memory leak造成momory不够
- delete失败, 多次delete同一块memory应用程序抛出的异常
- 多次free:
char *p = malloc(100);
free(p);
free(p);
- fclose多次:
FILE *fp = fopen(“test.txt”, “wb+”);
printf(“%p\n”, fp);
fclose(fp);
printf(“%p\n”, fp);
fclose(fp);
SIGSEGV(signal 11)
- 多为memory越界，比如访问已经被delete掉的memory
//call NULL pointer
struct hello p = NULL;
printf(“%d\n”, p->a);
//fclose NULL pointer
FILE fp = NULL;
fclose(fp);
SIGPIPE(signal 13)
堆栈相关
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| //Check call stack
(gdb) bt
#0 0x00008634 in core (out=0x0) at core.c:9
#1 0x000086e8 in main (argc=1, argv=0xbe85db74) at core.c:25
//Select stack frame
(gdb) f 1
#1 0x000086e8 in main (argc=1, argv=0xbe85db74) at core.c:25
25 core(NULL);
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变量相关
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| //Check variable:
(gdb) print out
$1 = (int *) 0x0
//Check function arguments:
(gdb) info args
argc = 1
argv = 0xbe85db74
//Check local variables:
(gdb) info locals
tmp = 2
out = 0xbe85da14
coredump = {rlim_cur = 4294967295, rlim_max = 4294967295}
flg = 0
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线程相关
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| //打印出所有线程的bt信息,但是有时候印不全
(gdb) thread apply all bt
//打印出所有的线程
(gdb) info thread
//切换到线程1来打印bt信息:
(gdb) thread 1
[Switching to thread 1 (LWP 1192)]
#0 0xf5d89a48 in ioctl () from ./symbols/lib/libc.so.6
(gdb) bt
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指针相关
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| //把PC的执行的指令显示出来
(gdb) x/i $pc
=> 0x40e254 <android::BpInterface<ITvManagerClient>::~BpInterface()+12>: str r0, [r11, #-8]
//反汇编某个文件
$arm-none-linux-gnueabi-gdb libcore.so
(gdb) disassemble 0x508
Dump of assembler code for function functest:
0x00000508 <+40>: str r2, [r3]
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