Patch Name: PHKL_23957

Patch Description: s700_800 11.11 Boot panic (w/Fiber Ch. & Gig. Ethernet) fix

Creation Date: 01/04/23

Post Date:  01/04/26

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_23957: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_23957

Symptoms:
	PHKL_23957:
	( SR:8606188166 CR:JAGad57374 )
	A panic (because of a Data Page Fault) occurs on boot,
	with the function "reserve_io_alias_entries()" in the
	backtrace.  This is known to happen when a Fiber Channel
	A5158A card and Gigabit (ST & TX) card are installed in
	the system.  There is a chance that this panic will
	happen with other combinations of cards.

	An example stack trace is:

	  panic+0x6c
	  report_trap_or_int_and_panic+0x94
	  trap+0xed4
	  nokgdb+0x8
	  reserve_io_alias_entries+0xac        <--
	  io_map_regs+0x9c
	  pa_map_iface_regs+0x9c
	  elroy_map_iface_regs+0x40
	  td_map_membase_srombase+0x164
	  td_claim+0x1d4
	  fcms_claim+0x3c
	  pci_cdio_config+0xb0
	  gio_scan_subtree+0xe8
	  gio_scan_subtree_real+0x184
	  gio_scan_subtree+0x84
	  gio_scan_subtree_real+0x184
	  gio_scan_subtree+0x84
	  gio_scan_subtree_real+0x184
	  gio_scan_subtree+0x84
	  io_scan+0x26c
	  io_virt_mode_config+0x90
	  DoCalllist+0x3c
	  main+0x28
	  $vstart+0x48
	  istackatbase+0x84

Defect Description:
	PHKL_23957:
	( SR:8606188166 CR:JAGad57374 )
	Because the kernel, 64-bit user processes, and 32-bit user
	processes all need to access IO pages, we need to have the
	capability of mapping multiple virtual addresses to the
	same physical IO page.  The infrastructure to handle this
	uses an "io alias" structure to keep track of these
	aliases.  These structures are linked on two lists, a
	"free" list and a "reserve" list.  The paradigm is that
	io aliases are first reserved, and then used.

	The defect was in the way we handled the entries on the
	free list - we have the list, and we have an integer that
	contains the length of the list.  These two values were
	not kept consistent, resulting in the list manipulation
	code walking off the end of the free list.

	This defect hasn't been seen before because it took a
	certain pattern of requests for IO aliases to properly
	tickle the defect.

	Resolution:
	The solution was simple - fix the place were the length
	of the free list becomes inconsistent with the integer
	representing the length of that free list.

SR:
	8606188166

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o):
		vm_pdir2_0.c $Date: 2001/04/18 11:40:19 $Revision: r
			11.11/1 PATCH_11.11 (PHKL_23957)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o):
		vm_pdir2_0.c $Date: 2001/04/18 11:40:19 $Revision: r
			11.11/1 PATCH_11.11 (PHKL_23957)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	4125009711 59552 /usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	150515559 158096 /usr/conf/lib/libvm-pdk.a(vm_pdir2_0.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 240 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_23957

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_23957.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_23957.  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_23957.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_23957.depot

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

		dd if=/tmp/PHKL_23957.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None