Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Created attachment 958545[details]
Output when running ntpq with the bug reproducing command-line.
Description of problem:
ntpq crashes on CentOS 6.5. I believe this would happen also on RHEL 6.5 because RHEL is the upstream provider for CentOS.
Version-Release number of selected component (if applicable):
$ rpm -q -i ntp
Name : ntp Relocations: (not relocatable)
Version : 4.2.6p5 Vendor: CentOS
Release : 1.el6.centos Build Date: Sat 23 Nov 2013 11:51:55 PM IST
Install Date: Tue 18 Nov 2014 02:04:53 PM IST Build Host: c6b9.bsys.dev.centos.org
Group : System Environment/Daemons Source RPM: ntp-4.2.6p5-1.el6.centos.src.rpm
Size : 1706943 License: (MIT and BSD and BSD with advertising) and GPLv2
Signature : RSA/SHA1, Mon 25 Nov 2013 01:02:50 AM IST, Key ID 0946fca2c105b9de
Packager : CentOS BuildSystem <http://bugs.centos.org>
URL : http://www.ntp.org
Summary : The NTP daemon and utilities
-- snipped --
How reproducible:
Always.
Steps to Reproduce:
1. Install ntp.
$ sudo yum install ntp
2. Start the ntp service.
$ sudo service ntpd start
3. Run the following command-line:
$ ntpq -n -c raw -c associations -c "mreadvar &1 &65535" 127.0.0.1
Actual results:
See, "ntpq-backtrace.txt" for the output and the backtrace.
Expected results:
ntpq should exit without crashing.
Additional info:
Created attachment 958560[details]
Changes to that fix the bug
I downloaded ntp's SRPM from here:
http://vault.centos.org/6.5/os/Source/SPackages/ntp-4.2.6p5-1.el6.centos.src.rpm
The ntpq binary was built after enabling debugging symbols. Using gdb, it was found that free() was being called on a stack variable in the mreadvar(), function in ntpq-subs.c. The solution is to initialize the variable so that free() no longer returned error. Attached is the fix.
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.
https://rhn.redhat.com/errata/RHSA-2015-1459.html