Patch Name: PHKL_10866 Patch Description: s700 10.01 root ACL entry and UFS inode locking patch Creation Date: 97/04/25 Post Date: 97/04/28 Hardware Platforms - OS Releases: s700: 10.01 Products: N/A Filesets: OS-Core.CORE-KRN Automatic Reboot?: Yes Status: General Release Critical: Yes PHKL_10866: OTHER The system in unable to boot. PHKL_10486: PANIC HANG The system hangs when a large number of users try to log in/out of the system simultaneously. PHKL_9515: HANG Path Name: /hp-ux_patches/s700/10.X/PHKL_10866 Symptoms: PHKL_10866: If an ACL entry is made to the root file system root directory inode, the system is unable to boot. PHKL_10486: A system "HANG" occurs whenever a large number of users log In/Out at the same time. The password file has large number of entries and the system can have around 1000 concurrent connections. Problem occurs when many processes try to access the same file concurrently, the inode locking routines start dealing with the contention very inefficiently. PHKL_9515: Adding an access control list (ACL) entry to the root file system root directory inode (creating a continuation inode) will render the HP-UX 10.01 system (both 700 and 800) unbootable. Defect Description: PHKL_10866: This is a kernel routine iflush() problem on HP-UX 10.01. When ACL is attached to the root directory on the root file system, the system fails to boot. if "/" has an ACL, the root file system can not be unmounted at the end of /etc/pre_init_rc because iflush() thinks that "/"s continuation inode in the inode cache means that the file system is still busy. PHKL_10486: Classic "thundering herd" problem was made worse by the fact that the first thing each woken process did was to try to lock a "COMMON" spinlock. A process that gets the spinlock first, locks the INODE and releases the spinlock has to try hard to be able to get the spinlock second time while it tries to unlock the same inode. Hence the inode was locked whilst no useful work was being done. PHKL_9515: If you make an ACL entry to the root file system root directory inode, you can not reboot your system. The cause of defect is that unmount1() calls iflush() to determine if there are any IREF inodes in the cache for this device which are not the root inode itself or its quota inode. If the root inode has an ACL, there is a continuation inode also IREF in the cache, so iflush() tells unmount1() that the device is busy. Unmount1() sleeps a bit and tries again. The result is the same. The fix for this defect is to change iflush() in the ufs_inode.c file to ignore the continuation inodes of "/" and the quota file in its check for active inodes in the file system being unmounted. SR: 1653142109 1653211987 4701349175 Patch Files: /usr/conf/lib/libufs.a(ufs_inode.o) what(1) Output: /usr/conf/lib/libufs.a(ufs_inode.o): ufs_inode.c $Date: 97/04/25 12:32:21 $ $Revision: 1. 40.72.54 $ PATCH_10.01 (PHKL_10866) cksum(1) Output: 3784334241 24784 /usr/conf/lib/libufs.a(ufs_inode.o) Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHKL_9515 PHKL_10486 Equivalent Patches: None Patch Package Size: 80 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_10866 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHKL_10866.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_10866.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_10866. 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_10866.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_10866.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: None