Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.1k views
in Technique[技术] by (71.8m points)

c - segmentation fault after main returns

I have a long program in c over Linux, that gives me segmentation fault after main returns. Its a long program, so I cant post it. So can you help me what can make such error?

Thank You.

Wow, Those answers came really fast. Thank you all. I think i worked it out, i forgot to malloc a string and used it as buffer. Now that I've malloced it, it does not signal me with a segmentation fault.

Once again, thank you all.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Guess: you might be accidentally corrupting the stack in main so it's lost the return address. Do you have a string buffer there that you could be overrunning?

If not, you should try:

  • running the program under valgrind
  • debugging the program with gdb to catch the crash and see where you are at that point; you can also debug the core file dumped

It might help to install glibc-debug packages if your distro has them since you'll be in glibc code at that point.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...