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Full Discussion: enabling core dumps for daemon processes
Operating Systems Linux Ubuntu enabling core dumps for daemon processes Post 302362127 by tsurko on Thursday 15th of October 2009 04:30:29 AM
Old 10-15-2009
enabling core dumps for daemon processes
Hello,
I am debugging a program which works as daemon. It sigfaults, unfortunately I'm unable to generate core dump file. Here is what I am doing:
Code:
tsurko@bastila:~$ ulimit -c unlimited
tsurko@bastila:~$ ulimit -c
unlimited
tsurko@bastila:~$ cat /etc/sysctl.conf | grep 'core_pattern'
kernel.core_pattern = "/var/log/dumps/core.%e.%p"
tsurko@bastila:~$ ls -l /var/log | grep dumps
drwxrwxrwt 2 root      root    4096 2009-10-04 12:34 coredumps
drwxrwxrwx 2 root      root    4096 2009-10-15 02:22 dumps

I'm compiling the application with -g to generate debug symbols but finally when it sigfaults no coredump file is generated neither in the directory specified above, nor in the directory where the bin is located. I've also checked in / (it is the working direcotry of the daemon process - no good).
What I am missing?
 

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LEARN ABOUT X11R4

systemd-sysctl.service

SYSTEMD-SYSCTL.SERVICE(8)				      systemd-sysctl.service					 SYSTEMD-SYSCTL.SERVICE(8)

NAME

       systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot

SYNOPSIS

       /lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...]

       systemd-sysctl.service

DESCRIPTION

       systemd-sysctl.service is an early boot service that configures sysctl(8) kernel parameters by invoking /lib/systemd/systemd-sysctl.

       When invoked with no arguments, /lib/systemd/systemd-sysctl applies all directives from configuration files listed in sysctl.d(5). If one
       or more filenames are passed on the command line, only the directives in these files are applied.

       In addition, --prefix= option may be used to limit which sysctl settings are applied.

       See sysctl.d(5) for information about the configuration of sysctl settings. After sysctl configuration is changed on disk, it must be
       written to the files in /proc/sys before it takes effect. It is possible to update specific settings, or simply to reload all
       configuration, see Examples below.

OPTIONS

       --prefix=
	   Only apply rules with the specified prefix.

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

EXAMPLES

       Example 1. Reset all sysctl settings

	   systemctl restart systemd-sysctl

       Example 2. View coredump handler configuration

	   # sysctl kernel.core_pattern
	   kernel.core_pattern = |/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I

       Example 3. Update coredump handler configuration

	   # /lib/systemd/systemd-sysctl --prefix kernel.core_pattern

       This searches all the directories listed in sysctl.d(5) for configuration files and writes /proc/sys/kernel/core_pattern.

       Example 4. Update coredump handler configuration according to a specific file

	   # /lib/systemd/systemd-sysctl 50-coredump.conf

       This applies all the settings found in 50-coredump.conf. Either /etc/sysctl.d/50-coredump.conf, or /run/sysctl.d/50-coredump.conf, or
       /usr/lib/sysctl.d/50-coredump.conf will be used, in the order of preference.

       See sysctl(8) for various ways to directly apply sysctl settings.

SEE ALSO

       systemd(1), sysctl.d(5), sysctl(8),

systemd 237														 SYSTEMD-SYSCTL.SERVICE(8)
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