Patch Name: PHKL_25031

Patch Description: s700_800 11.04 (VVOS) semaphore panic cumulative patch

Creation Date: 01/08/29

Post Date:  01/09/10

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_25031: PANIC
		Based on HP-UX Patch PHKL_22799:  PANIC
	PHKL_18751: HANG
		Based on HP-UX Patch PHKL_13121:  HANG
		heavy user of POSIX named semaphores

Category Tags:
	defect_repair general_release critical panic halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_25031

Symptoms:
	PHKL_25031:
	Ported HP-UX patch PHKL_22799 to VVOS

	Based on HP-UX patch PHKL_22799:
	(SR:8606165035 CR:JAGad34332)
	An application program using sem_post() panics the system
	with message "panic: Data page fault".

	PHKL_18751:
	Ported HP-UX patch PHKL_14762 to VVOS

	Based on HP-UX patch PHKL_14762:
	The previous patch has been recut to include compile-based
	performance tuning.  There is no functional change in this
	patch.

	Based on HP-UX patch PHKL_13121:
	Heavy use of POSIX named semaphores (sem_init, sem_open,
	sem_getvalue, etc.) can hang the system.  The system
	must be under a heavy load to encounter this defect.

Defect Description:
	PHKL_25031:
	Ported HP-UX patch PHKL_22799 to VVOS

	Based on HP-UX patch PHKL_22799:
	(SR:8606165035 CR:JAGad34332)
	The system tries to grap a semaphore before it is fully
	created because of a locking problem resulting in
	accessing a NULL pointer that causes the system to panic.
	Resolution:
	The fix is to ensure that the semaphore will not be
	accessed before it is fully created. Setting the
	semaphore pointer to NULL right before we releases the
	lock before copy_out() will fix the problem. If the
	value of semaphore is NULL, do not give up the semaphore
	in ksem_getlock() which is called by all the semaphore
	functions.

	PHKL_18751:
	Ported HP-UX patch PHKL_14762 to VVOS

	Based on HP-UX patch PHKL_14762:
	None

	Based on HP-UX patch PHKL_13121:
	ksem_read() calls ksem_getlock() to acquire a lock, then
	subsequently calls copyout() which can potentially block.
	Another caller of ksem_getlock() will loop until it can
	get the same lock.  If the lock holder is scheduled to run
	on the same processor as the thread who is looping, a
	deadlock will result.  Alternatively, on a uniprocessor
	system there is only one processor available for execution,
	so the deadlock is certain if contention arises.

SR:
	4701374587 8606165035

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(pm_rtsem.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_rtsem.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(pm_rtsem.o):
		pm_rtsem.c $Date: 2000/11/21 17:04:54 $Revision: r11
			ros/3 PATCH_11.00 (PHKL_22799)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_rtsem.o):
		pm_rtsem.c $Date: 2000/11/21 17:04:54 $Revision: r11
			ros/3 PATCH_11.00 (PHKL_22799)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	4091966855 11700 /usr/conf/lib/libhp-ux.a(pm_rtsem.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	3903444291 32672 /usr/conf/lib/libhp-ux.a(pm_rtsem.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_18751 

Equivalent Patches:
	PHKL_22799:
	s700: 11.00
	s800: 11.00

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_25031

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_25031.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_25031.  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_25031.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_25031.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_25031.depot

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

		dd if=/tmp/PHKL_25031.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None