Patch Name: PHKL_27688

Patch Description: s700_800 11.11 Over-temp/LPMC Panic

Creation Date: 02/08/14

Post Date:  02/08/15

Hardware Platforms - OS Releases:
	s700: 11.11
	s800: 11.11

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_27688: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_27688

Symptoms:
	PHKL_27688:
	( SR:8606231975 CR:JAGae01211 )
	A system panics when an over-temperature ENVironmental
	event (ENV) is followed by a Low Priority Machine Check
	(LPMC).

	Panic String:
	  Trap Type 18 (Data memory protection fault):

	Stack trace:

	  0) panic+0x14
	  1) report_trap_or_int_and_panic+0x84
	  2) interrupt+0x1d4
	  3) $ihndlr_rtn+0x0
	  4) diag2_log+0x620
	  5) diag_log+0x20
	  6) log_lpmcs+0x78
	  7) lpmc_lumberjack+0x4c
	  8) invoke_callouts_for_self+0xc0
	  9) sw_service+0xb0
	  10) mp_ext_interrupt+0x150
	  11) ivti_patch_to_nop3+0x0
	  12) idle+0xaa8
	  13) swidle_exit+0x0

	The panic stack trace can differ from the stack
	trace shown here. However, diag2_log will always
	be involved.

Defect Description:
	PHKL_27688:
	( SR:8606231975 CR:JAGae01211 )
	The diag2 driver was not checking for address alignment
	when logging events into a kernel buffer.

	All logging events, except ENV (ENVironmental logging
	event), are of even length and, hence, word-aligned.

	Each logging event was entered into the diag2 driver's
	logging buffer immediately after the preceeding logging
	record. Since all logging records, except ENV, are of
	even length, the subsequent logging record would be
	written to a word-aligned address.

	The ENV (over-temperature) record is of odd length.

	After an ENV was logged, the next event logged (which, in
	all reported panics, has been an LPMC) would hit a
	non-word-aligned address, causing a system panic.

	Although, in all reported cases, the panic occurred when
	an LPMC was reported, theoretically, it could occur when
	any record was logged. The panic always occurred when
	attempting to log a record AFTER an over-temp condition
	was successfully logged.

	Since the over-temp record was logged successfully, it
	was not in the panic stack trace and it would not
	be obvious that an over-temp condition had occurred.

	Resolution:
	The diag2 driver code has been modified to write to and
	read from word-aligned addresses in the kernel logging
	buffer. No event can be written to a non-word-aligned
	address.

SR:
	8606231975

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libwsio.a(diag2.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libwsio.a(diag2.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libwsio.a(diag2.o):
		diag2.c $Date: 2002/08/08 12:45:49 $Revision: r11.11
			/1 PATCH_11.11 (PHKL_27688)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libwsio.a(diag2.o):
		diag2.c $Date: 2002/08/08 12:45:49 $Revision: r11.11
			/1 PATCH_11.11 (PHKL_27688)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	3032083725 16464 /usr/conf/lib/libwsio.a(diag2.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	3214042851 42200 /usr/conf/lib/libwsio.a(diag2.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_26001:
	s700: 11.00
	s800: 11.00

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_27688

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_27688.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_27688.  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_27688.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_27688.depot

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

		dd if=/tmp/PHKL_27688.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None