Patch Name: PHKL_16498 Patch Description: s700 10.20 UFS disk leak/UFS small mmap file hang patch Creation Date: 98/09/21 Post Date: 98/10/01 Warning: 99/05/24 - This Critical Warning has been issued by HP. - PHKL_16498 introduces a problem with memory mapped files. When a file is copied to an HFS file system and later accessed through mmap(), the data accessed via mmap() may be stale. - One manifestation of the problem is that the kernel build during an HP-UX 10.20 to 11.00 upgrade may fail with an 'ld: I/O error' message. This failure will occur if /stand is an HFS file system and PHKL_16498 is in the running HP-UX 10.20 kernel. - The problem is corrected in PHKL_18617, which was released today. HP recommends that PHKL_16498 be removed from all systems on which it is installed, especially before updating to HP-UX 11.00. PHKL_18617 should be installed after PHKL_16498 has been removed. PHKL_16498 should also be removed from all depots that contain it. - For system maintenance reasons, HP recommends that PHKL_16498 be removed before PHKL_18617 is installed. If you choose not to remove PHKL_16498 first, the system will still function properly after PHKL_18617 is installed. - PHKL_16498 is in the following Extension Software General Release Patch Bundles: Feb 1999: XSWGR7001020,B.10.20.43 Apr 1999: XSWGR7001020,B.10.20.44 Jun 1999: XSWGR7001020,B.10.20.45 Hardware Platforms - OS Releases: s700: 10.20 Products: N/A Filesets: OS-Core.CORE-KRN Automatic Reboot?: Yes Status: General Superseded With Warnings Critical: Yes PHKL_16498: HANG PHKL_10259: OTHER UFS file systems could experience disk space leak. Path Name: /hp-ux_patches/s700/10.X/PHKL_16498 Symptoms: PHKL_16498: Customer may sometimes see many processes hang when using a highly accessed smaller than 4k (page size) memory mapped file. PHKL_10259: Disk space leak on UFS file systems; running fsck(1M) on a `clean' file system would report inconsistencies such as: ... ** Phase 1 - Check Blocks and Sizes INCORRECT BLOCK COUNT I=386 (4 should be 1) ... ** Phase 5 - Check Cyl groups 3 BLK(S) MISSING ... This would be observed only on UFS file systems with a fragment size less than 4KB. Defect Description: PHKL_16498: Problem was due to procedure ufs_pagein() flushing beyond the inode byte size when rounding up to use page size number of bytes. Now we prevent other blocks which are not part of the memory mapped file from being blkflushed. This resolves the possible deadlock found. PHKL_10259: A corner case use of mmap(2) consisting of mapping the first few bytes of a small file (less than 3KB) residing on a UFS file system wrongly resulted in increasing the number of fragments allocated to the file. The file-system disk space could leak, but running fsck(1M) would fix the problem. This problem would only occur on UFS file systems using a fragment size less than 4KB. SR: 1653259861 4701347963 Patch Files: /usr/conf/lib/libhp-ux.a(ufs_vm.o) what(1) Output: /usr/conf/lib/libhp-ux.a(ufs_vm.o): ufs_vm.c $Date: 98/09/21 17:07:11 $ $Revision: 1.7 .98.8 $ PATCH_10.20 (PHKL_16498) cksum(1) Output: 622897237 10568 /usr/conf/lib/libhp-ux.a(ufs_vm.o) Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHKL_10259 Equivalent Patches: PHKL_16499: s800: 10.20 Patch Package Size: 70 KBytes Installation Instructions: Please review all instructions and the Hewlett-Packard SupportLine User Guide or your Hewlett-Packard support terms and conditions for precautions, scope of license, restrictions, and, limitation of liability and warranties, before installing this patch. ------------------------------------------------------------ 1. Back up your system before installing a patch. 2. Login as root. 3. Copy the patch to the /tmp directory. 4. Move to the /tmp directory and unshar the patch: cd /tmp sh PHKL_16498 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHKL_16498.depot 5b. For a homogeneous NFS Diskless cluster run swcluster on the server to install the patch on the server and the clients: swcluster -i -b This will invoke swcluster in the interactive mode and force all clients to be shut down. WARNING: All cluster clients must be shut down prior to the patch installation. Installing the patch while the clients are booted is unsupported and can lead to serious problems. The swcluster command will invoke an swinstall session in which you must specify: alternate root path - default is /export/shared_root/OS_700 source depot path - /tmp/PHKL_16498.depot To complete the installation, select the patch by choosing "Actions -> Match What Target Has" and then "Actions -> Install" from the Menubar. 5c. For a heterogeneous NFS Diskless cluster: - run swinstall on the server as in step 5a to install the patch on the cluster server. - run swcluster on the server as in step 5b to install the patch on the cluster clients. By default swinstall will archive the original software in /var/adm/sw/patch/PHKL_16498. If you do not wish to retain a copy of the original software, you can create an empty file named /var/adm/sw/patch/PATCH_NOSAVE. Warning: If this file exists when a patch is installed, the patch cannot be deinstalled. Please be careful when using this feature. It is recommended that you move the PHKL_16498.text file to /var/adm/sw/patch for future reference. To put this patch on a magnetic tape and install from the tape drive, use the command: dd if=/tmp/PHKL_16498.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: None