Bug 824402
| Summary: | snmptrapd core dumps while running within valgrind with perl trap handler | ||||||||
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| Product: | Red Hat Enterprise Linux 6 | Reporter: | Dalibor Pospíšil <dapospis> | ||||||
| Component: | net-snmp | Assignee: | Jan Safranek <jsafrane> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | Dalibor Pospíšil <dapospis> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | unspecified | ||||||||
| Version: | 6.3 | ||||||||
| Target Milestone: | rc | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | Unspecified | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | |||||||||
| 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.
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Story Points: | --- | ||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2013-02-21 10:27:09 UTC | Type: | Bug | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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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 |
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: