Bug 1465918

Summary:	pam_cgroup.so is getting segfaulted every time while trying to switch user.
Product:	Red Hat Enterprise Linux 6	Reporter:	Prasad Kulkarni <pkulkarn>
Component:	libcgroup	Assignee:	Nikola Forró <nforro>
Status:	CLOSED DUPLICATE	QA Contact:	Kernel General QE <kernel-general-qe>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.9	CC:	jsafrane, pkis, varekova
Target Milestone:	rc
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Hardware:	All
OS:	Linux
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Last Closed:	2017-06-28 13:17:59 UTC	Type:	Bug
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Description Prasad Kulkarni 2017-06-28 12:44:24 UTC

Description of problem:
pam_cgroup.so is getting segfaulted every time while trying to switch user.


Version-Release number of selected component (if applicable):
libcgroup-pam.x86_64 0:0.40.rc1-23.el6 (from optional channel)

How reproducible:
Always

Steps to Reproduce:
1. Follow the steps mentioned under "Procedure 4.4. Using a PAM module to move processes to cgroups" section in https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/sec-cpu_and_memory-use_case.html to install and configure pam-libcgroup module

2. use "su" command to become a different user on a system.

3. You will receive "segmentation fault" message and following will be logged in messages file.

-------
Jun 27 16:10:36 rhel6u9-3 yum[1954]: Installed: libcgroup-pam-0.40.rc1-23.el6.x86_64
Jun 27 16:17:30 rhel6u9-3 kernel: su[2090]: segfault at 0 ip 00007f030fcd6ac4 sp 00007ffe99d1c940 error 4 in pam_cgroup.so[7f030fcd6000+1000]
Jun 27 16:17:31 rhel6u9-3 abrt[2091]: Saved core dump of pid 2090 (/bin/su) to /var/spool/abrt/ccpp-2017-06-27-16:17:31-2090 (3239936 bytes)
Jun 27 16:17:31 rhel6u9-3 abrtd: Directory 'ccpp-2017-06-27-16:17:31-2090' creation detected
Jun 27 16:17:41 rhel6u9-3 kernel: ip_tables: (C) 2000-2006 Netfilter Core Team
-------

Actual results:
While switching to any (normal) user receive "segmentation fault" message.

Expected results:
Switch user should work.

Comment 4 Nikola Forró 2017-06-28 13:17:59 UTC

Hi Prasad,

this bug has already been reported, although with sshd service.

*** This bug has been marked as a duplicate of bug 1419519 ***