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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-130) qdrouterd with --daemon and --user options does not dump core.
Date Wed, 01 Apr 2015 13:56:54 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390579#comment-14390579

Alan Conway commented on DISPATCH-130:

There is a historical problem with core dumps and setuid executables, e.g. from https://access.redhat.com/solutions/4896

6) With this setup, a core file from the application should result. If this does not generate
a core, make sure that the application has the correct uid and that it does not use setuid
to change uid when running. On Red Hat Enterprise Linux 3, use the following command to enable
the dumping of setuid applications:

# echo 1 > /proc/sys/kernel/core_setuid_ok

This kernel setting no longer exists on RHEL6/Fedora 21 but it looks likely the the problem
is in the way we are setting the UID in qdroutered with --user.

Given the presence of systemd as well, it might be best to get rid of the daemonizing logic
in qdrouterd and use the daemon() function for sysv init or let systemd do daemonizing when
systemd is in use.

> qdrouterd with --daemon and --user options does not dump core.
> --------------------------------------------------------------
>                 Key: DISPATCH-130
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-130
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Container
>    Affects Versions: 0.3
>            Reporter: Alan Conway
>            Assignee: Alan Conway
>             Fix For: 0.4
> If qdroutered is started with --daemon and --user options, and then is killed with SIGABRT
or crashes, it does not produce a core file. Note both --daemon and --user are reqiured to
produce the problem, either alone does not. Tested on RHEL6 and Fedora 21 as follows:
> Send core files in /tmp, since --daemon will set current directory to /
> {noformat}
> # echo /tmp/core.%e.%p > /proc/sys/kernel/core_pattern
> {noformat}
> Verify we do get a core file with just --daemon
> {noformat}
> # qdrouterd --daemon
> # pkill -e -6 qdrouterd
> qdrouterd killed (pid 11482)
> # ls /tmp/core*
> /tmp/core.qdrouterd.11482
> {noformat}
> Now add --user 
> {noformat}
> # rm /tmp/core*
> # qdrouterd --daemon --user aconway
> # pkill -e -6 qdrouterd
> qdrouterd killed (pid 11432)
> # ls /tmp/core*
> ls: cannot access /tmp/core*: No such file or directory
> {noformat}

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