Patch Name: PHKL_25030

Patch Description: s700_800 11.04 (VVOS) Fix for panic in kernel profiling

Creation Date: 01/08/30

Post Date:  01/09/24

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_25030: PANIC HANG
		Based on HP-UX Patch PHKL_21681:  PANIC HANG

Category Tags:
	defect_repair general_release critical panic halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_25030

Symptoms:
	PHKL_25030:
	Ported HP-UX patch PHKL_21681 to VVOS

	Based on HP-UX patch PHKL_21681:
	(SR: 8606128587 CR: JAGac86134)
	Turning on kernel profiling may cause the system
	to hang.

	(SR: 8606162544 CR: JAGad31860)
	Turning on kernel profiling may cause a spinlock
	deadlock panic.  The stack trace may be similar to:

	    profiling_set_it+0x94
	    set_it+0x190
	    clock_int+0x98
	    mp_ext_interrupt+0x144
	    ivti_patch_to_nop3+0x0
	    mp_ext_interrupt+0x10c
	    ivti_patch_to_nop3+0x0
	    read16_pdc_iodc+0x88
	    core_create_child+0x5c
	    core_scan+0x2b0
	    gio_scan_subtree+0x188
	    gio_scan_subtree+0x1c4
	    gio_scan_subtree+0x1c4
	    io_scan+0x9c
	    do_io_scan+0x48
	    dev_config_ioctl+0xd8
	    spubind_cdev_ioctl+0x94
	    spec_ioctl+0xac
	    vno_ioctl+0x90
	    ioctl+0x1d8
	    syscall+0x480
	    $syscallrtn+0x0

Defect Description:
	PHKL_25030:
	Ported HP-UX patch PHKL_21681 to VVOS

	Based on HP-UX patch PHKL_21681:
	(SR: 8606128587 CR: JAGac86134)
	When the time until the next clock tick is calculated
	as a negative number, we can infinitely loop with
	interrupts disabled in the kernel profiling routine
	that schedules the next sampling time.

	Resolution:
	The kernel profiling code was changed to allow proper
	exit from a loop when the time until the next clock
	tick is negative.

	(SR: 8606162544 CR: JAGad31860)
	Spinlock held too long in kernel profiling routines.

	Resolution:
	The kernel profiling code was changed to ensure the
	spinlock was properly released.

SR:
	8606128587 8606162544

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(subr_mcnt.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(subr_mcnt.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(subr_mcnt.o):
		subr_mcnt.c $Date: 2000/09/28 13:24:44 $Revision: r1
			1ros/5 PATCH_11.00 (PHKL_21681)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(subr_mcnt.o):
		subr_mcnt.c $Date: 2000/09/28 13:24:44 $Revision: r1
			1ros/5 PATCH_11.00 (PHKL_21681)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	2066335023 9940 /usr/conf/lib/libhp-ux.a(subr_mcnt.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	3115277028 21152 /usr/conf/lib/libhp-ux.a(subr_mcnt.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_21681:
	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_25030

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_25030.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_25030.  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_25030.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_25030.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_25030.depot

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

		dd if=/tmp/PHKL_25030.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None