Patch Name:  PHKL_5434

Patch Description: s700 10.00 Fixes panic when using async driver with LVM

Creation Date: 95/04/04

Post Date:  95/04/19

Hardware Platforms - OS Releases:
        s700: 10.00

Products: N/A

Filesets:
        LVM.LVM-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
        Yes
        PHKL_5434: PANIC

Path Name:  /hp-ux_patches/s700/10.X/PHKL_5434

Symptoms:
        PHKL_5434:
        The kernel panics in pdremap().

Defect Description:
        PHKL_5434:
        The kernel panics in pdremap() when using async driver and
        LVM. The async driver sets the B2_NOMERGE flag in the buffer
        but this is not relayed to the disc drivers when going
        through LVM. So, when the disc drivers do request merging
        it can lead to a case where the kernel panics due to
        translations missing for some virtual pages.

        This can be easily reproduced by using the async driver
        and writing to the contigous portions of the disc from
        the same virtual address. If the write is done through
        a logical volume and if there are sufficient number of
        async requests the kernel would panic. If the write
        is done through a regular block device and not through
        LVM it does not panic.

SR:
        1653127399

Patch Files:
        /usr/conf/lib/liblvm.a(lv_schedule.o)

what(1) Output:
        /usr/conf/lib/liblvm.a(lv_schedule.o):
                lv_schedule.c  $Date: 95/04/04 10:56:29 $ $Revision:
                         1.11.91.9 $ PATCH_10.0 (PHKL_5434)

cksum(1) Output:
        1749312873 17764 /usr/conf/lib/liblvm.a(lv_schedule.o)

Patch Conflicts: None

Patch Dependencies:  None

Hardware Dependencies:  None

Other Dependencies:  None

Supersedes:  None

Equivalent Patches:
        PHKL_5435:
        s800: 10.00

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_5434

        5. Run swinstall to install the patch:

                swinstall -x autoreboot=true -x match_target=true
                        -s /tmp/PHKL_5434.depot

        By default swinstall will archive the original software in
        /var/adm/sw/patch/PHKL_5434.  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_5434.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:

                swpackage -s /tmp/PHKL_5434.depot -x
                        target_type=tape -d /dev/rmt/0m PHKL_5434

Special Installation Instructions:  None