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Old 03-25-2005, 02:40 AM   #1
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seg fault on fedora only

hi, i am still new to linux, so please give me as much advise as you can. thank you.

what's the best way to debug a seg fault if it only happens on my fedora linux 3 laptop? it runs without problem on my friend's debian-based machine, and also on school's solaris workstation. it's driving me crazy and i can find the line where the program hangs but it makes no sense to me.

any suggestion is greatly appreciated.
Old 03-25-2005, 05:07 AM   #2
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- Run it in the debugger (gdb). Sometimes a program does not segfault when running in gdb, while it does segfault without gdb.

- Thorougly read the code.

- run it with "valgrind".
Old 03-25-2005, 05:18 AM   #3
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95% of the segfaults I get are because of bad RAM in the machine... just something to keep in mind if you don't see anything strange from gdb.
Old 03-26-2005, 12:57 PM   #4
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thank you both.

the code is written by my friend, he tested it on his machine with valgrind to avoid memory leaks. it returned no error. on my machine valgrind returns a whole bunch of "mismatched free/delete" thing, and sometimes during run time, instead of seg fault, it says something like"*****glibc detects double free******"

my friend says it might be glibc that's giving me problem. i think the version i have is the most current one. how do i fix this?

oh, i've also swapped different memory modules, same result, so i don't think it's hardware issue.

thank you again, and any suggestion is helpful.


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