Unable to create a core file for my crashed program
Solution 1
Your real question appears to be not "where is my core dump", but rather "how can I modify /proc/sys/kernel/core_pattern
".
sudo bash -c 'echo core.%e.%p > /proc/sys/kernel/core_pattern'
should do the trick.
Solution 2
You need to adjust your core dump size limit with following command:
ulimit -S -c maximum-core-dump-size
The the value is given in Kb.
Solution 3
you do not need to use core pattern. its just dumps in that format %e.%p
what you need to do is #ulimit -c unlimited
and check #ulimit -a
and confirm if core file size is set properly. You will get the core as core.pid after that.
Solution 4
My understanding is that using ulimit is not permanent, i.e. if you reboot then the limit goes back to 0. To have unlimited permanent, you need to change /etc/security/limits.conf. Similarly for core pattern etc, change /etc/sysctl.conf.
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Surjya Narayana Padhi
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Updated on June 18, 2022Comments
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Surjya Narayana Padhi about 2 years
I am using Ubuntu 12.04 LTS. I wrote a simple program as follows to create crash
// null.c #include<stdio.h> int main() { int *p = NULL; int k=*p; printf("%d",sizeof(0)); return 0; }
Now I run with "gcc -g null.c" and then "./a.out" and the output is as expected.
Segmentation fault (core dumped)
Now I want to see the core dump file using gdb. I did the following things
- I checked the current directory, there is no core dump file
- I tried tried to change the /proc/sys/kernel/core_pattern with the content "core.%e.%p". But i am not able to write into the file. It is saying "Fsync Failed".
- I used the "sudo vi /proc/sys/kernel/core_pattern". Still can't write into the file.
I want to create the core dump in my current directory. What to do now?
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LF00 almost 3 yearsroot user get Operation not permitted.