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.
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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: | |||
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Description
RHEL Program Management
2011-03-11 16:36:52 UTC
with this guiltyfunc: bug 680126
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.
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 |