Patch Name: PHKL_30590

Patch Description: s700_800 11.11 application hangs using msg queues

Creation Date: 04/04/13

Post Date: 04/07/14

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_30590: CORRUPTION HANG
	PHKL_29070: HANG
		        Multi-threaded application hang.

Category Tags:
	defect_repair general_release critical halts_system
	corruption

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_30590

Symptoms:
	PHKL_30590:
	( SR:8606329286 CR:JAGae90410 )
	An application making use of the system V message queue
	facility (see msgget(2)) may hang.  In addition, messages
	reported by the system to have been properly sent to a
	particular system V message queue may be lost.

	PHKL_29070:
	( SR:8606306961 CR:JAGae69996 )
	Applications may hang using Sys V message sends.

Defect Description:
	PHKL_30590:
	( SR:8606329286 CR:JAGae90410 )
	There is a race within the system V message queue facility
	wherein a given message queue can be used when it is
	allocated but before it is fully initialized.
	This may result in the corruption of the kernel control
	data for that particular message queue, as the
	initialization of a particular message queue can occur
	concurrently with its use. This corruption of kernel data
	fields for that particular message queue can cause the
	calling application to hang, as the message queue can be
	placed into an inconsistent state.  Messages can be lost
	similarly: the kernel control data containing the number
	of messages on the queue can become corrupted.  These
	conditions are quite rare and can only occur if the
	application passes into the message queue facility (via
	msgsnd(2), msgrcv(2), or msgctl(2)) a message queue id
	that is not the result of a matching msgget(2) call.

	Resolution:
	Proper synchronization is performed to ensure that a
	message queue must be fully initialized before it can
	be used.

	PHKL_29070:
	( SR:8606306961 CR:JAGae69996 )
	If during the usage of message operations, an application
	erroneously attempts a message send that is too large,
	the application can hang and become unkillable.  This can
	happen only if the system and the application are setup
	in the following manner:

	The system is tuned such that msgmnb >65535 (enable big
	message queues) and msgmax >65535 (allow big individual
	messages).

	The application must be compiled without the
	-D__BIGMSGQUEUE_ENABLED option and it attempts to enqueue
	a large single message >65535 bytes.

	Resolution:
	Release the semaphore lock in the error reporting code.

Enhancement:
	No

SR:
	8606306961 8606329286

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

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

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libpm.a(sysV_ipc.o):
		sysV_ipc.c $Date: 2004/04/07 23:37:58 $Revision: r11
			.11/1 PATCH_11.11 (PHKL_30590)
	/usr/conf/lib/libpm.a(sysV_msg.o):
		sysV_msg.c $Date: 2004/04/07 23:37:58 $Revision: r11
			.11/2 PATCH_11.11 (PHKL_30590)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libpm.a(sysV_ipc.o):
		sysV_ipc.c $Date: 2004/04/07 23:37:58 $Revision: r11
			.11/1 PATCH_11.11 (PHKL_30590)
	/usr/conf/lib/libpm.a(sysV_msg.o):
		sysV_msg.c $Date: 2004/04/07 23:37:58 $Revision: r11
			.11/2 PATCH_11.11 (PHKL_30590)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	2005522857 2064 /usr/conf/lib/libpm.a(sysV_ipc.o)
	895923209 15516 /usr/conf/lib/libpm.a(sysV_msg.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	443518246 4896 /usr/conf/lib/libpm.a(sysV_ipc.o)
	3220395247 45528 /usr/conf/lib/libpm.a(sysV_msg.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_29070 

Equivalent Patches:
	PHKL_30073:
	s700: 11.00
	s800: 11.00

Patch Package Size: 50 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_30590

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_30590.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_30590.  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_30590.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_30590.depot

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

		dd if=/tmp/PHKL_30590.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None