Patch Name: PHKL_30245

Patch Description: s700_800 11.23 fixes for TLB fault and spinlock panics

Creation Date: 04/01/20

Post Date: 04/02/09

Hardware Platforms - OS Releases:
	s700: 11.23
	s800: 11.23

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_30245: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_30245

Symptoms:
	PHKL_30245:
	( SR:8606341992 CR:JAGaf02899 )
	System panic with a Data TLB fault at pte_modget+0xf1.
	The stack trace will be similar to the stack below:

	panic_save_regs_switchstack+0x110
	panic+0x310
	post_hndlr+0xc20
	vm_hndlr+0x220
	bubbledown+0x0
	pte_modget+0xf0
	ptmodget+0xd0
	hdl_getbits+0x290
	vm_vfdcheck+0x160
	vfds_walk+0xb0
	btree_walk+0x2f0
	btree_walk+0x3d0
	foreach_valid+0xa0
	vm_find_next_range+0x90
	nfs_pageout+0x220
	stealpages+0x340
	vhand_core+0x6a0
	vhand_global_pager+0x470
	vhand_service_mem_class+0x360
	vhand+0x1a0
	im_vhand+0x190
	DoCalllist+0x3a0
	main+0x30
	swidle+0x0:

	( SR:8606323616 CR:JAGae86081 )
	panic with a stack trace similar to the stack trace below

	panic: Spinlock held too long!
	Stack Trace:
	  IP                  Function Name
	  0xe0000000006bde50  too_much_time+0x530
	  0xe00000000038f470  wait_for_lock_spinner+0x190
	  0xe00000000038f150  wait_for_lock+0x130
	  0xe00000000103f2f0  spinlock_wait+0x30
	  0xe000000000567ae0  ptdpage+0xe0
	  0xe000000000565970  hdl_deletetrans+0x150
	  0xe000000000525f20  vfd_deltransc+0x2a0
	  0xe000000000570100  btree_walk+0x100
	  0xe00000000056ffd0  foreach_chunk+0x50
	  0xe000000000556f40  hdl_detach+0x160
	  0xe00000000051aa70  detachreg+0x190
	  0xe000000000516e70  dispreg+0x250
	  0xe0000000005849f0  exit+0x750
	  0xe00000000062ff00  rexit+0x40
	  0xe000000000528280  syscall+0x4f0
	End of Stack Trace

Defect Description:
	PHKL_30245:
	( SR:8606341992 CR:JAGaf02899 )
	When deleting large pages, the page offset was incorrectly
	updated.  This caused the incorrect alias page to be
	deleted.

	Resolution:
	The page offset is now updated after each deletion so
	that the alias deletion occurs on the correct offset.

	( SR:8606323616 CR:JAGae86081 )
	When deleting a translation from the head of the hash chain,
	the next entry is moved up to become the new head.  During
	the move, the next entry is temporarily marked as being
	not_present to prevent access to inconsistent data.  Other
	processes trying to access the page translation entry,
	'pte', will be suspended at the not_present handler until
	the move is complete.  In this case as a result of an
	external interrupt the calling thread is running on the
	same processor as the 'pte' deletion, the processor gets
	stuck in handling the not_present fault, and cannot finish
	marking the 'pte' as valid and then release the hash chain
	lock.

	Resolution:
	Remove the code that marks the 'pte' as not present while
	we are moving it to the head of the hash chain.  This is
	no longer necessary since the low level fault handler now
	checks to make sure that the 'pte' it's trying to use is
	not in a transient state.

Enhancement:
	No

SR:
	8606323616 8606341992

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_vhpt.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_vhpt.o):
		vm_vhpt.c $Date: 2003/12/29 11:58:32 $Revision: r11.
			23/2 PATCH_11.23 (PHKL_30245)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	3427719667 540432 /usr/conf/lib/libvm-pdk.a(vm_vhpt.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 90 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_30245

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_30245.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_30245.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	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_30245.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_30245.depot

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

		dd if=/tmp/PHKL_30245.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None