Patch Name: PHKL_13933

Patch Description: s700 10.01 mprotect(2) cumulative patch

Creation Date: 98/01/23

Post Date:  98/01/28

Hardware Platforms - OS Releases:
	s700: 10.01

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
	No (superseded patches were critical)
	PHKL_7529: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_13933

Symptoms:
	PHKL_13933:
	mprotect() system call causes high system time resulting
	in poor system performance.

	PHKL_7529:
	System panic with "Data page fault" in
	hdl_mprot_getprotids().

	Stack trace:
	  trap type 15, pcsq.pcoq = 0.1cac14, isr.ior = 0.4c09006
	  panic: (display==0xbf00, flags==0x0) Data page fault
	       panic+0x10
	       report_trap_or_int_and_panic+0x8c
	       trap+0x72c
	       $call_trap+0x20
	       hdl_mprot_getprotids+0x34
	       update_fast_protid_list+0xdc
	       checkprotid+0xa8
	       hdl_pfault+0x574
	       pfault+0xa
	       trap+0xcdc
	       $call_trap+0x20

Defect Description:
	PHKL_13933:
	Use of a global mprot_list_lock lock caused spinlock
	contention as its one lock per system and hence poor
	system performance. It is still used to protect
	mprot_list. The fix was to use another pool of locks
	called prp_hash_locks for protection ids. The hashing
	function chooses different locks (from this pool of hash
	locks) for different range of addresses thus removing
	dependency on the various locks that should be acquired
	before the protection ids for a given page are changed.

	PHKL_7529:
	The panic was caused by a race condition between
	hdl_split_sub() and hdl_mprot_getprotids() where
	hdl_split_sub() is modifying the subregion and
	subpregion of a MMAP pregion while hdl_mprot_getprotids()
	is accessing them without locking on another processor.

SR:
	5003316828 5003398800

Patch Files:
	/usr/conf/lib/libhp-ux.a(hdl_mprotect.o)
	/usr/conf/lib/libhp-ux.a(spinlock.o)

what(1) Output:
	/usr/conf/lib/libhp-ux.a(hdl_mprotect.o):
		hdl_mprotect.c   $Date: 98/01/23 14:23:57 $ $Revisio
			n: 1.2.72.11 $ PATCH_10.01 (PHKL_13933)
	/usr/conf/lib/libhp-ux.a(spinlock.o):
		spinlock.c   $Date: 98/01/23 14:27:41 $ $Revision: 1
			.10.72.54 $ PATCH_10.01 (PHKL_13933)

cksum(1) Output:
	2850855625 14756 /usr/conf/lib/libhp-ux.a(hdl_mprotect.o)
	3078974269 15736 /usr/conf/lib/libhp-ux.a(spinlock.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_7529

Equivalent Patches:
	PHKL_13934:
	s800: 10.01

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_13933

	5a. For a standalone system, run swinstall to install the
	    patch:

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_13933.depot

	5b. For a homogeneous NFS Diskless cluster run swcluster on the
	    server to install the patch on the server and the clients:

		swcluster -i -b

	    This will invoke swcluster in the interactive mode and
	    force all clients to be shut down.

	    WARNING: All cluster clients must be shut down prior to the
		     patch installation.  Installing the patch while the
		     clients are booted is unsupported and can lead to
		     serious problems.

	    The swcluster command will invoke an swinstall session in which
	    you must specify:

		alternate root path  -  default is /export/shared_root/OS_700
		source depot path    -  /tmp/PHKL_13933.depot

	    To complete the installation, select the patch by choosing
	    "Actions -> Match What Target Has" and then "Actions -> Install"
	    from the Menubar.

	5c. For a heterogeneous NFS Diskless cluster:

		- run swinstall on the server as in step 5a to install
		  the patch on the cluster server.

		- run swcluster on the server as in step 5b to install
		  the patch on the cluster clients.

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHKL_13933.  If you do not wish to retain a
	copy of the original software, you can create an empty file
	named /var/adm/sw/patch/PATCH_NOSAVE.

	Warning: If this file exists when a patch is installed, the
	         patch cannot be deinstalled.  Please be careful
		 when using this feature.

	It is recommended that you move the PHKL_13933.text file to
	/var/adm/sw/patch for future reference.

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

		dd if=/tmp/PHKL_13933.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None