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<TITLE>
TITLE: HP Tru64 UNIX - Potential Dead Lock and KMF in tape cam_changer code
Copyright (c) Hewlett-Packard Company 2005. All rights reserved.
PRODUCT: HP Tru64 UNIX [R] V5.1B-1/PK3
SOURCE: Hewlett-Packard Company
ECO INFORMATION:
ECO Name: T64KIT0025048-V51BB24-E-20050301
ECO Kit Approximate Size: 3.96MB
Kit Applies To: HP Tru64 UNIX V5.1B-1/PK3
ECO Kit CHECKSUMS:
/usr/bin/sum results:
63116 4060
/usr/bin/cksum results:
3449915388 4157440
MD5 results:
5b24a3e58c332caaa202d1573e1bc8fc
SHA1 results:
7030006d82100957f26b2de0e348edcc437a4cc5
ECO KIT SUMMARY:
A dupatch-based, Early Release Patch kit exists for HP Tru64 UNIX V5.1B-1/PK3
that contains solutions to the following problem(s):
Previous cam_changer Early Release Patches (ERPs) have been updated to
include an additional correction in cam_changer code. The ERP described
here now contains two fixes:
- A potential dead lock condition that manifests as an application hang
- A potential kernel memory fault (KMF)
The fixes are described below.
A. Potential Dead Lock
A dead lock condition can occur in cam_changer code while a changer
application is accessing the media changer. This condition is likely to
occur when a previous changer access failed with the error "SCSI device
busy," due to a chance that the access lock is not properly released. The
dead lock condition manifests as a changer application hang.
B. Potential KMF
A KMF can occur in the cam_changer code if more than one thread attempts to
access the changer at the same time. For example, if a robot is moving
tapes and another thread opens the same device the panic event is likely to
occur. This panic is more likely occur if the customer is running tape
backup software that uses multiple changer threads.
When the problem occurs, the customer loses any data written to the tape
library before final tape marks have been written. To correct for this
condition, the backup process must be reinitiated, which can lengthen the
time to complete backups within allocated production time frames.
The following is a typical changer KMF stack trace example:
crash> tf
> 0 stop_secondary_cpu src/kernel/arch/alpha/cpu.c : 1398
1 panic src/kernel/bsd/subr_prf.c : 1325
2 event_timeout src/kernel/arch/alpha/cpu.c : 2348
3 printf src/kernel/bsd/subr_prf.c : 1008
4 panic src/kernel/bsd/subr_prf.c : 1382
5 trap src/kernel/arch/alpha/trap.c : 2285
6 _XentMM src/kernel/arch/alpha/locore.s : 2237
7 ccmn_record_eei_status3 src/kernel/io/cam/pdrv3_common.c : 4763
8 changer_complete src/kernel/io/cam/cam_changer.c : 7681
9 xpt_callback_thread src/kernel/io/cam/xpt.c : 3357
The Patch Kit Installation Instructions and the Patch Summary and Release
Notes documents provide patch kit installation and removal instructions
and a summary of each patch. Please read these documents prior to
installing patches on your system.
The patches in this ERP kit will also be available in the next mainstream
patch kit - HP Tru64 UNIX V5.1B-3.
INSTALLATION NOTES:
1) Install this kit with the dupatch utility that is included in the patch
kit. You may need to baseline your system if you have manually changed
system files on your system. The dupatch utility provides the baselining
capability.
2) This ERP kit will NOT install over any Customer Specific Patches (CSPs)
which have file intersections with this ERP kit. Contact your normal
Service Provider for assistance if the installation of this ERP kit is
blocked by any of your installed CSPs.
INSTALLATION PREREQUISITES:
You must have installed HP Tru64 UNIX V5.1B-1/PK3 (BL24) prior to
installing this Early Release Patch Kit.
SUPERSEDE INFORMATION:
T64KIT0025048-V51BB24-E-20050301 replaces kit
T64KIT0024000-V51BB24-E-20041019
KNOWN PROBLEMS WITH THE PATCH KIT:
None.
RELEASE NOTES FOR T64KIT0025048-V51BB24-E-20050301:
Release Notes
This document summarizes the contents and special instructions for the
Tru64 UNIX V5.1B patches contained in this kit.
For information about installing or removing patches, baselining,
and general patch management, see the Patch Kit Installation
Instructions document.
1 Release Notes
This Early Release Patch Kit Distribution contains:
- fixes that resolve the problem(s) reported in:
o 242 QXCM1000219890
* for Tru64 UNIX V5.1B T64V51BB24AS0003-20030929.tar (BL24)
This kit includes a patch which requires system reboot.
The patches in this kit are being released early for general customer use.
Refer to the Release Notes for a summary of each patch and installation
prerequisites.
Patches in this kit are installed by running dupatch from the directory
in which the kit was untarred. For example, as root on the target system:
> mkdir -p /tmp/CSPkit1
> cd /tmp/CSPkit1
> <copy the kit to /tmp/CSPkit1>
> tar -xpvf DUV40D13-C0044900-1285-20000328.tar
> cd patch_kit
> ./dupatch
2 Special Instructions
There are no special instructions for Tru64 UNIX V5.1B Patch C1069.00
3 Summary of CSPatches contained in this kit
Tru64 UNIX V5.1B
PatchId Summary Of Fix
----------------------------------------
C1069.00 ERP, KMF and Dead Lock issue in cam_changer code.
4 Additional information from Engineering
None
5 Affected system files
This patch delivers the following files:
Tru64 UNIX V5.1B
Patch C1069.00
./sys/BINARY/cam.mod
CHECKSUM: 38565 620
SUBSET: OSFHWBIN540
./sys/BINARY/cam_changer.mod
CHECKSUM: 60616 320
SUBSET: OSFHWBIN540
./usr/sys/include/io/cam/cam_changer.h
CHECKSUM: 17452 33
SUBSET: OSFHWBINCOM540
[R] UNIX is a registered trademark in the United States and other countries
licensed exclusively through X/Open Company Limited.
Copyright Hewlett-Packard Company 2005. All Rights reserved.
This software is proprietary to and embodies the confidential technology
of Hewlett-Packard Company. Possession, use, or copying of this
software and media is authorized only pursuant to a valid written license
from Hewlett-Packard or an authorized sublicensor.
This ECO has not been through an exhaustive field test process.
Due to the experimental stage of this ECO/workaround, Hewlett-Packard
makes no representations regarding its use or performance. The
customer shall have the sole responsibility for adequate protection
and back-up data used in conjunction with this ECO/workaround.
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