Patch Name: PHKL_23057

Patch Description: s700_800 11.04 (VVOS) Fix VM page read-ahead panics

Creation Date: 01/01/02

Post Date:  01/03/17

Hardware Platforms - OS Releases:
	s700: 11.04
	s800: 11.04

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_23057: PANIC
			Based on HP-UX patch PHKL_22792: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_23057

Symptoms:
	PHKL_23057:
	Ported HP-UX Patch PHKL_22792 to VVOS.

	Based upon PHKL_22792:
	( SR: 8606147554 CR: JAGad16896 )
	Customer will see a data-page-fault panic in pdprotget().
	A typical panic stack would look like:

	    panic+0x14
	    report_trap_or_int_and_panic+0x80
	    trap+0xdb8
	    nokgdb+0x8
	    pdprotget+0xa0
	    process_read_ahead_pages+0x1a8
	    hdl_pfault+0x6a0
	    pfault+0x104
	    copyin+0x170
	    uiomove+0xc0
	    rwip+0x398
	    ufs_rdwr+0x124
	    vno_rw+0x84
	    writev+0x17c
	    syscall+0x480
	    $syscallrtn+0x0

	( SR: 8606170083 CR: JAGad39347 )
	Customer will see a data-page-fault panic in pdprotget().
	A typical panic stack would look like:

	    panic+0x14
	    assfail+0x3c
	    _assfail+0x2c
	    sl_pre_check+0x120
	    spinlock+0x18
	    vfault+0xd8
	    trap+0x10e4
	    nokgdb+0x8
	    pdprotget+0x224
	    process_read_ahead_pages+0x36c
	    hdl_vfault+0x518
	    vfault+0x2b8
	    trap+0x1370
	    nokgdb+0x8
	    copyin+0xbc
	    uiomove+0x4a4
	    rw3vp+0x7ec
	    nfs3_write+0x140
	    nfs3_rdwr+0x8c
	    vno_rw+0xa4
	    4_2fa4_cl_rwuio+0x298
	    write+0x78
	    syscall+0x5fc
	    $syscallrtn+0x0

	( SR: 8606156441 CR: JAGad25776 )
	pfd corruption -- manifests as data-page-fault in
	pdv_modset2_0 or pdv_protaccset2_0.
	A typical panic stack would look like:

	    panic+0x14
	    report_trap_or_int_and_panic+0x84
	    interrupt+0x1d4
	    $ihndlr_rtn+0x0
	    pdv_modset2_0+0x27c
	    pdmodset+0x14c
	    hdl_unsetbits+0x264
	    pageiocleanup+0x11c
	    pageiodone+0x2c
	    biodone+0x1f0
	    lv_complete+0xc0
	    lv_terminate+0xd4
	    lv_parwrite_done+0x148
	    lv_end+0x128
	    biodone+0x1f0
	    scsi_fast_cbfn+0x260
	    c720_isr+0x52c
	    sapic_interrupt+0x2c
	    up_ext_interrupt+0x2c8
	    ivti_patch_to_nop2+0x0
	    idle+0x1c4
	    swidle_exit+0x0

	Based upon PHKL_21511:
	( SR: 8606130257 CR: JAGac95128 )
	System panics with a data page fault due to various reasons,
	such as virtual address not mapped, allocation of page zero,
	or using a page of size zero. In most cases, the system
	is doing heavy I/O across NFS mounts.

	A typical panic stack would look like:

	    panic+0x14
	    allocate_page+0x12c
	    allocpfd+0x24
	    vfdfill+0x58
	    vm_fill_in_pages+0x64
	    vm_prepare_io+0x28
	    nfs_pagein+0x20c
	    virtual_fault+0x1c4
	    vfault+0xf4
	    trap+0x714

Defect Description:
	PHKL_23057:
	Ported HP-UX Patch PHKL_22792 to VVOS.

	Based upon PHKL_22792:
	( SR: 8606147554 CR: JAGad16896 )
	process_read_ahead_pages() both in its forward and backward
	loops, does not correctly check for the presence of
	translation.

	Resolution:
	Check both for the existence of an address translation for
	the physical page, and make sure it is translated to our
	address.

	( SR: 8606170083 CR: JAGad39347 )
	Incorrect parameter passed to pdprotget() call.

	Resolution:
	Pass the updated virtual address instead of the starting
	address again and again.

	( SR: 8606156441 CR: JAGad25776 )
	We were freeing the pfd at the granularity of the superpage
	instead of the 4K sub-page.

	Resolution:
	Use freepfd_one() to release a single 4K sub-page, instead
	of freepfd().

	Based upon PHKL_21511:
	( SR: 8606130257 CR: JAGac95128 )
	For better performance, the user data access pattern is
	tracked and read-ahead is implemented for sequential
	I/O's. A defect in the read-ahead code decrements the
	reference count of pages within a large page incorrectly.
	This results in freeing still in-use pages and corrupting
	the memory freelist. When invalid pages are returned to the
	allocation routines, the system panics with data page fault.

	Resolution:
	Decrement reference count of large pages correctly.

SR:
	8606130257 8606147554 8606156441 8606170083

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	/usr/conf/lib/libhp-ux.a(vfs_vm.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vfs_vm.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	/usr/conf/lib/libhp-ux.a(vfs_vm.o):
		vfs_vm.c $Date: 2000/11/20 22:58:36 $Revision: r11ro
			s/9 PATCH_11.00 (PHKL_22792)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vfs_vm.o):
		vfs_vm.c $Date: 2000/11/20 22:58:36 $Revision: r11ro
			s/9 PATCH_11.00 (PHKL_22792)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	97209200 43468 /usr/conf/lib/libhp-ux.a(vfs_vm.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	3285172743 94056 /usr/conf/lib/libhp-ux.a(vfs_vm.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 11.04: PHKL_19142
	s800: 11.04: PHKL_19142

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_22792:
	s700: 11.00
	s800: 11.00

Patch Package Size: 170 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_23057

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_23057.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_23057.  If you do not wish to retain a
	copy of the original software, use the patch_save_files option:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -x patch_save_files=false -s /tmp/PHKL_23057.depot

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHKL_23057.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_23057.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHKL_23057.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_19142.
	For successful installation please insure that PHKL_19142
	is already installed, or that PHKL_19142 is included
	in the same depot with this patch and PHKL_19142
	is selected for installation.