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Created attachment 586321 [details]
valgrind log

Description of problem:
snmptrapd core dumps while running within valgrind with perl trap handler.

# cat /etc/snmp/snmptrapd.conf
disableAuthorization yes
perl do "/usr/local/bin/trapreciver.pl";

# cat /usr/local/bin/trapreciver.pl
#!/usr/bin/perl
use SNMP;
sub my_receiver {
print "Trap received\n";
}
NetSNMP::TrapReceiver::register("all", \&my_receiver)
    or warn "Failed to register Perl trap handler\n";
print "Registered Perl trap handler\n";


Version-Release number of selected component (if applicable):
net-snmp-5.5-41.el6
valgrind >= 3.6.0-5.el6

How reproducible:
always


Steps to Reproduce:
1. # valgrind -v --leak-check=yes /usr/sbin/snmptrapd -Lsd -p /var/run/snmptrapd.pid -f &
2. send trap: # service restart snmpd
3. kill %1
  
Actual results:
snmptrapd core dumps

Expected results:
no core dump

Additional info:

snmptrapd destroys embeded perl in TERM signal handler. After snmptrapd handles the signal, it returns to processing of incoming traps and if embedded perl is enabled, it may call it. But the embedded perl is already destroyed -> SIGSEGV.

This bug is reproducible only with valgrind-3.6.0-5.el6, older -4.el6 release does not exhibit this bug.

Created attachment 586326 [details]
patch

(In reply to comment #0)
> How reproducible:
> always

I would say it's reproducible in about 30% of test runs on my virtual machine, definitely not 100%.

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0421.html