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Bug 456218 - kernel: serial open/close loop disables irq [rhel-5.3]
Summary: kernel: serial open/close loop disables irq [rhel-5.3]
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.3
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Eugene Teo (Security Response)
QA Contact: Martin Jenner
Depends On:
TreeView+ depends on / blocked
Reported: 2008-07-22 09:51 UTC by Eugene Teo (Security Response)
Modified: 2009-01-20 20:22 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2009-01-20 20:22:39 UTC
Target Upstream Version:

Attachments (Terms of Use)
Upstream patch for this issue (deleted)
2008-07-22 09:55 UTC, Eugene Teo (Security Response)
no flags Details | Diff
Proposed backported patch (deleted)
2008-07-22 09:59 UTC, Eugene Teo (Security Response)
no flags Details | Diff
Reproducer (deleted)
2008-07-22 10:00 UTC, Eugene Teo (Security Response)
no flags Details

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2009:0225 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 5.3 kernel security and bug fix update 2009-01-20 16:06:24 UTC

Description Eugene Teo (Security Response) 2008-07-22 09:51:49 UTC
A Debian user reported that a simple program that repeatedly opens and closes a
serial device will eventually cause an irq line to be disabled.


Comment 2 Eugene Teo (Security Response) 2008-07-22 09:55:50 UTC
Created attachment 312322 [details]
Upstream patch for this issue

Comment 3 Eugene Teo (Security Response) 2008-07-22 09:59:10 UTC
Created attachment 312323 [details]
Proposed backported patch

Comment 4 Eugene Teo (Security Response) 2008-07-22 10:00:13 UTC
Created attachment 312324 [details]


Comment 5 Eugene Teo (Security Response) 2008-07-22 10:09:14 UTC
The bug is reported to be reproducible if the kernel is compiled with
CONFIG_PREEMPT_NONE=y. I have tested this on rhel-4, and rhel-5, but without
success. On rhel-5, the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY=y, and
/dev/ttyS* are not accessible to local unprivileged users (unless you are in
uucp group for /dev/ttyS[1-3]). Let's get it fixed anyway.

Comment 7 RHEL Product and Program Management 2008-07-22 13:31:48 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update

Comment 8 Don Zickus 2008-07-25 20:26:56 UTC
in kernel-2.6.18-100.el5
You can download this test kernel from

Comment 12 errata-xmlrpc 2009-01-20 20:22:39 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.

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