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Bug 684275

Summary:	kernel: BUG: warning at drivers/char/tty_audit.c:55/tty_audit_buf_free() [rhel-6.0.z]
Product:	Red Hat Enterprise Linux 6	Reporter:	RHEL Program Management <pm-rhel>
Component:	kernel	Assignee:	Frantisek Hrbata <fhrbata>
Status:	CLOSED ERRATA	QA Contact:	Eryu Guan <eguan>
Severity:	high	Docs Contact:
Priority:	urgent
Version:	6.0	CC:	aviro, csf1dsh, dfeng, dhoward, donhoover, eguan, mitr, pm-eus, qcai, sgrubb
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-2.6.32-71.26.1.el6	Doc Type:	Bug Fix
Doc Text:	Using the pam_tty_audit.so module (which enables or disables TTY auditing for specified users) in the /etc/pam.d/sudo file and in the /etc/pam.d/system-auth file when the audit package is not installed resulted in soft lock-ups on CPUs. As a result, the kernel became unresponsive. This was due to the kernel exiting immediately after TTY auditing was disabled, without emptying the buffer, which caused the kernel to spin in a loop, copying 0 bytes at each iteration and attempting to push each time without any effect. With this update, a locking mechanism is introduced to prevent the aforementioned behavior.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-10 18:13:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	680126
Bug Blocks:

Description RHEL Program Management 2011-03-11 16:36:52 UTC

This bug has been copied from bug #680126 and has been proposed
to be backported to 6.0 z-stream (EUS).

Comment 5 KernelOops Bot 2011-04-26 05:16:09 UTC

 with this guiltyfunc:  bug 680126

Comment 7 Martin Prpič 2011-05-05 08:58:08 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Using the pam_tty_audit.so module (which enables or disables TTY auditing for specified users) in the /etc/pam.d/sudo file and in the /etc/pam.d/system-auth file when the audit package is not installed resulted in soft lock-ups on CPUs. As a result, the kernel became unresponsive. This was due to the kernel exiting immediately after TTY auditing was disabled, without emptying the buffer, which caused the kernel to spin in a loop, copying 0 bytes at each iteration and attempting to push each time without any effect. With this update, a locking mechanism is introduced to prevent the aforementioned behavior.

Comment 8 errata-xmlrpc 2011-05-10 18:13:16 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0498.html