Patch Name: PHKL_27839

Patch Description: s700_800 11.11 physio thread hang

Creation Date: 02/09/12

Post Date:  02/10/17

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: No

Category Tags:
	defect_repair general_release

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_27839

Symptoms:
	PHKL_27839:
	( SR:8606261885 CR:JAGae26205 )
	In a multi-threaded process, if one thread is doing
	raw or character device I/O, other threads in the
	process may fail to make forward progress until the
	I/O completes.

Defect Description:
	PHKL_27839:
	( SR:8606261885 CR:JAGae26205 )
	The raw I/O routine was holding the process' virtual
	address space (vas) lock for the duration of the I/O,
	even though it was not needed for the normal case and
	only rarely needed for an exception case.  This
	effectively blocked any other thread in the process
	which needed access to the vas lock, such as for
	another I/O, thread creation, mmap, thread exit, etc.,
	for the duration of the I/O.  When the I/O was to a
	slow device, such as a tape drive, this could be a
	considerable delay.

	Resolution:
	Eliminated use of the vas lock in the normal raw or
	character device I/O path, retaining its usage only
	for the rare exception case.

Enhancement:
	No

SR:
	8606261885

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

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

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libsvc-pdk.a(physio.o):
		physio.c $Date: 2002/09/05 13:05:35 $Revision: r11.1
			1/1 PATCH_11.11 (PHKL_27839)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libsvc-pdk.a(physio.o):
		physio.c $Date: 2002/09/05 13:05:35 $Revision: r11.1
			1/1 PATCH_11.11 (PHKL_27839)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	389841480 10916 /usr/conf/lib/libsvc-pdk.a(physio.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	1219005764 22128 /usr/conf/lib/libsvc-pdk.a(physio.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_27364:
	s700: 11.00
	s800: 11.00

Patch Package Size: 60 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_27839

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_27839.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_27839.  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_27839.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_27839.depot

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

		dd if=/tmp/PHKL_27839.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None