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CentOS 6.4 Core files

Hi,

I have installed CentOS 6.4 64bit few days ago and noticed that the hard drive got full within few days. I looked in /tmp folder and noticed lots of core.numbers files ie core.1111 core.32323

These files are being created every few seconds.

ulimit -c shows zero which basically means that no core file should be created.

I would like to know why these files are being created? Apparently I need to know the application that is creating this file before debugging.

And how do I stop these files from being created?

Thanks.

Kerem ERSOY

Hi,

Will you post your dmsesg output here?

Cheers,
K.

ezzadin

ASKER

Hi,

Attached is the dmesg.

Thanks.
dmesg.txt

Kerem ERSOY

I did not find anything unusual here. Will you please post :

/etc/sysctl.conf

/var/log/messages

Kerem ERSOY

It seems that your system was configured to generate core dump files for crashes. I think we need to find what is causing crashes.

ezzadin

ASKER

Hi,

here is sysctl:

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

# Controls the default maxmimum size of a mesage queue
kernel.msgmnb = 65536

# Controls the maximum size of a message, in bytes
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296

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I didnt see anything is /var/log/messages.

I rebooted the system few minutes ago and it stopped creating the files...

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Kerem ERSOY

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ezzadin

ASKER

I actually had this box installed and configured in the office and had is running for few days then shut it down and moved it to our data-center and powered up.

The system started creating the dump file when it was powered up in the data-center, so as you mentioned maybe it just booted from rescue kernel and once the server was rebooted, it started normally.

In any case, thanks for your help.

Kerem ERSOY

You're welcome.