gdb快速定位错误位置——万恶的Segmentation fault

原文地址:https://blog.csdn.net/qq_38631503/article/details/80093855

万恶的Segmentation fault(core dumped)

• 生成core文件

$ ulimit -c unlimited 
$ ls 
clion  CMakeCache.txt  CMakeFiles  cmake_install.cmake  core  Makefile

• 使用gdb调试core文件

$ gdb clion core
	错误片段
	...
	[New LWP 12543]
	[New LWP 12546]
	[Thread debugging using libthread_db enabled]
	Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
	Core was generated by `./clion'.
	Program terminated with signal SIGSEGV, Segmentation fault.
	#0  0x0000000000000000 in ?? ()
	[Current thread is 1 (Thread 0x7fb2d8d1df40 (LWP 12543))]

• 在gdb中使用where查看更详细信息

(gdb) where
# 错误在main.cpp:72
	Undefined command: "".  Try "help".
	(gdb) #0  0x0000000000000000 in ?? ()
	(gdb) #1  0x0000000000401722 in main () at /home/deepin/C/clion/main.cpp:72

• 错误代码

使用了已经delete的内存topi_conf

   RdKafka::Conf *topi_conf = RdKafka::Conf::create(RdKafka::Conf::CONF_TOPIC);
    if (!topi_conf) {
    
    
        fprintf(stderr, "Create Topic configuer failed: %s\n", errstr.c_str());
        exit(1);
    }
    
    delete topi_conf; 

    if (topi_conf->set("auto.offset.reset", "largest", errstr) != RdKafka::Conf::CONF_OK) {
    
    
        fprintf(stderr, "Failed to set auto.offset.resetL %s\n", errstr.c_str());
        exit(1);
    }