Patch Name: PHKL_24652

Patch Description: s700_800 11.11 longjmp() panic due to lookuppn()

Creation Date: 01/08/01

Post Date:  01/08/02

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_24652: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_24652

Symptoms:
	PHKL_24652:
	( SR:8606205411 CR:JAGad74586 )
	A panic can occur in longjmp() if lookuppn() is called
	before it in the syscall() path.  The stack trace is
	shown below:

	Stack trace of event 0:

	 stack trace for event 0
	 crash event was a panic
	 cannot find unwind or stub descriptor for pc==0x0'0405d694
	 panic+0x6c
	 longjmp+0x28
	 panic+0x6c

Defect Description:
	PHKL_24652:
	( SR:8606205411 CR:JAGad74586 )
	The panic occurs in longjmp() due to lookuppn() failing
	to restore the buffer holding the values necessary for
	longjmp() to return out of the syscall(). When lookuppn()
	has been called in the syscall() path, it modifies the
	value of the buffer containing the values to return
	from that syscall. After this has been done, if the
	syscall() gets aborted with a longjmp(), the longjmp()
	will incorrectly return to lookuppn() rather than to
	the syscall() at the top of the stack. This causes
	the kernel to panic.

	Resolution:
	lookuppn() now restores the buffer used by longjump()
	to the values it held prior to the call to lookuppn().

SR:
	8606205411

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

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

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libfs.a(vfs_lookup.o):
		vfs_lookup.c $Date: 2001/07/16 09:19:42 $Revision: r
			11.11/1 PATCH_11.11 (PHKL_24652)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libfs.a(vfs_lookup.o):
		vfs_lookup.c $Date: 2001/07/16 09:19:42 $Revision: r
			11.11/1 PATCH_11.11 (PHKL_24652)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	618111306 7360 /usr/conf/lib/libfs.a(vfs_lookup.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	552226526 15072 /usr/conf/lib/libfs.a(vfs_lookup.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

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_24652

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_24652.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_24652.  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_24652.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_24652.depot

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

		dd if=/tmp/PHKL_24652.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None