Segmentation fault in Unix shell (linux OS)

Shell Programming and Scripting
1

Hi,

I am trying to run an online downloaded tool but I am having an eror segmentation fault.

./multicoil test.seq
Config file /home/kmohanas/MULTICOIL/multicoil_config
window length 0 = 28
window length 1 = 28
multi_lib = 3 4 5 
multi_lib = 2 3 4 
pair_lib = 1 2 4 
printfile = /dev/null
log = ~/MULTICOIL/TEST_RUNS/test.seq.log
seq scores = ~/MULTICOIL/TEST_RUNS/test.seq.seq_scores
out = ~/MULTICOIL/TEST_RUNS/test.seq.out
Reading Gen Frequences.
Reading Position Frequences.
Reading Position Frequences.
Segmentation fault

Any help is much appreciated

Thanks

2

The problem is likely in the data you are giving the tool. I am assuming the tool is well-written, which is not always true.

A segmentation fault occurs when a process tries to access memory beyond or outside of memory the process owns. For example, maybe you have 3 lines of data (100 bytes per line) that do not have newlines. If the code reads that one line into memory expecting 100 bytes it gets 400. (3+1 with a newline) The storage set up to read may only allow for 100 bytes, so when you read the long line, you have tried to write to a "part" of the memory you do not own.

3

It is not the shell that's segfaulting. The shell is sitting doing nothing waiting for the tool to quit when the segfault happens.

4

Hi all,

Thanks for the reply. I figured it out where it went wrong. Thanks again.

5

Then please take a few minutes to share the solution with everyone. It may help someone else in the future.

Regards,
Alister

6

yes please

7

While the program was running, I was supposed to press any key for further compilation. When I pressed enter, it resulted in segmentation fault. But when I pressed space or some other key, it worked and problem was solved.