Bug 824402 - snmptrapd core dumps while running within valgrind with perl trap handler
snmptrapd core dumps while running within valgrind with perl trap handler
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: net-snmp (Show other bugs)
Unspecified Unspecified
unspecified Severity medium
: rc
: ---
Assigned To: Jan Safranek
Dalibor Pospíšil
Depends On:
  Show dependency treegraph
Reported: 2012-05-23 08:07 EDT by Dalibor Pospíšil
Modified: 2013-02-21 05:27 EST (History)
0 users

See Also:
Fixed In Version: net-snmp-5.5-44.el6
Doc Type: Bug Fix
Doc Text:
Previously, snmptrapd daemon destroyed embedded perl interpreter immediately when TERM signal was received, regardless if the embedded perl was still used or not. This could lead to rare crashes of the daemon during shutdown. In this update, the embedded perl interpreter is destroyed later during the daemon shutdown, when all perl processing is already finished.
Story Points: ---
Clone Of:
Last Closed: 2013-02-21 05:27:09 EST
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
valgrind log (150.71 KB, application/octet-stream)
2012-05-23 08:07 EDT, Dalibor Pospíšil
no flags Details
patch (856 bytes, patch)
2012-05-23 08:18 EDT, Jan Safranek
no flags Details | Diff

  None (edit)
Description Dalibor Pospíšil 2012-05-23 08:07:56 EDT
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
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):
valgrind >= 3.6.0-5.el6

How reproducible:

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:
Comment 1 Jan Safranek 2012-05-23 08:16:07 EDT
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.
Comment 2 Jan Safranek 2012-05-23 08:18:40 EDT
Created attachment 586326 [details]
Comment 3 Jan Safranek 2012-05-23 08:22:10 EDT
(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%.
Comment 4 RHEL Product and Program Management 2012-09-10 04:19:36 EDT
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.
Comment 9 errata-xmlrpc 2013-02-21 05:27:09 EST
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.


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