Red Hat Bugzilla – Bug 88611
Processes started via CGI die when httpd dies
Last modified: 2013-07-02 22:59:45 EDT
Description of problem:
Using a simple perl script:
if ($< ne 0)
exec ("sudo /var/www/cgi-bin/test.cgi");
print "Content-Type: text/html\n\n";
works perfecty when executed from command line (as root or via sudo). But when
executing via apache/cgi/sudo, postgres/postmaster processes die instantly when
httpd is stopped.
Version-Release number of selected component (if applicable):
Version from RHL7.3+errata.
Steps to Reproduce:
1. Create the script above
2. Tweak sudo
3. Run it via apache/cgi
PostgreSQL dies when httpd is stopped.
PostgreSQL continues running when httpd is stopped.
This problem is seems to exists with ucd-snmp as well - it seems that this is
somehow related to the fact the PostgreSQL and ucd-snmp both use su in their
init scripts. Any patches/workarounds/comments would be highly appreciated.
The problem exists with RHL9, too. The difference between RHL7.3 and RHL9 is
that with RHL7.3 httpd restart is completed, with RHL9 not (i.e., httpd is only
stopped). But the main point is that why PostgreSQL dies?
So, any news on this one? Or is this the right component?
Trying my luck with another component.
Any news from this? A sole "RTFM" comment would be warmly welcomed, if that's
all what's needed!
What user is the CGI script running as? Unless it's root (which you
shouldn't run CGI scripts as) this is probably never going to work
I would guess that this is somehow making the postmaster part of the
process group for httpd, and that the shutdown method used for httpd
sends SIGTERM to the whole process group. (Seems a bit odd though
since I'd have thought spawning via "su -c" would put the child
process into its own group.)
If this theory is correct then adding -S to the postmaster switches in
the PG start script (put it in the -o stuff in the pg_ctl start call)
might make the difficulty go away. I'm not familiar enough with httpd
to ensure I'm reproducing your test case --- could you try this and
Note that I'd not want to make this change to the official script, as
it would interfere with plans to support logging to stderr better.
However it might do as a workaround, and anyway we need to be sure we
understand the cause of the problem before thinking about "real"
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If this issue is still present in a current Fedora Core release, please
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Closing as CANTFIX.