bash: ulimit: core file size: cannot modify limit: Operation not permitted

UK2 · #1 7th December 2009, 06:37 AM

Hello,

Fedora 12
gcc 4.4.1

I am doing some programming, and my program gave me a stack dump.

However, there is no core file for me to examine.

So I did:

Code:

ulimit -c unlimited

and got this error message:

Code:

bash: ulimit: core file size: cannot modify limit: Operation not permitted

I also tried setting ulimit to 50000 and still got the same error.

The results of ulimit -a:

Code:

$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 12275
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

I am not sure what else to do,

Many thanks for any suggestions,

diamond_ramsey · #2 7th December 2009, 06:52 AM

UK2, thank you for your post.

Quote:

Originally Posted by UK2

...However, there is no core file for me to examine.

So I did:

Code:

ulimit -c unlimited

and got this error message:

Code:

bash: ulimit: core file size: cannot modify limit: Operation not permitted

I also tried setting ulimit to 50000 and still got the same error.

The results of ulimit -a:

Code:

$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 12275
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

...

Are you doing this as root?

As a regular user, that error message looks right. For root, this should be effected at least for that shell.

Hope this helps.

UK2 · #3 7th December 2009, 09:03 AM

Hello,

I was doing that as my regular user.

Having rebooted I was able to set the ulimit to unlimited without getting that error, using my regular user.

However, when I test my application and it gives a seg dump, I still don't get the core file.

Code:

$ ulimit -a
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 12275
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Many thanks for any more suggestions,

aleph · #4 7th December 2009, 09:34 AM

check the PAM config files at /etc/security/limits.conf and files under /etc/security/limits.d/
per-user limit settings cannot override PAM limits