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Old 10-12-2009, 03:30 AM   #1
Registered: May 2009
Distribution: fedora 10
Posts: 34

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Segmentation fault.

Hello, when I try to design a small filesystem, it always have the Segmentation fault.#: make makefile
# Segmentation fault.
then I use gdb,
# gdb ./filsys
(gdb) r
Starting program: /home/os/filsys
Do you want to format the disk
Format will erase all context on the disk.Are You Sure?

Program received signal SIGSEGV, Segmentation fault.
fseek (fp=0x0, offset=0, whence=0) at fseek.c:40
40 _IO_acquire_lock (fp);

the question is,I cann't find the fseek.c anywhere,so I cann't solve the problem,can you help me?thanks very much.I think I should try my best to find the error in the code,code is too long,so the question i describe is not in detail.

Last edited by CZTY; 10-12-2009 at 03:53 AM.
Old 10-12-2009, 07:49 AM   #2
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When you are in gdb after the seg fault, the first thing you need is a backtrace.

Maybe that will be all you need, or maybe what you see in the backtrace will just tell you where to look next.

Type the command
in gdb, and you will get a call stack of how your program reached the incorrect call to fseek.

I cann't find the fseek.c
There is no reason to want to look at fseek.c. You already can see that fp=0 on entry to fseek, so you know that the error is in whatever provides that fp value, not in fseek itself. Maybe that error is in the function that directly called fseek or maybe it is in something further up the call stack.

Last edited by johnsfine; 10-12-2009 at 07:50 AM.
Old 10-13-2009, 10:24 PM   #3
Registered: May 2009
Distribution: fedora 10
Posts: 34

Original Poster
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Thanks for your help,I remove the seg error.
Old 10-13-2009, 11:03 PM   #4
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and the solution was?


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