Patch Name: PHKL_22024

Patch Description: s700 10.20 VxFS (JFS) process hang; invalid error messages

Creation Date: 00/07/12

Post Date:  00/07/13

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	JournalFS.VXFS-BASE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_22024: HANG

Path Name: /hp-ux_patches/s700/10.X/PHKL_22024

Symptoms:
	PHKL_22024:
	(SR: 8606144416   CR: JAGad13756)

	  System hang caused by someone going through the
	buffer pool to flush out dirty buffers. The buffer
	is marked dirty but also marked busy, and the process
	or thread decide to wait for it. Because of this,
	ServiceGuard commands like cmapplyconf, cmcheckconf.
	hang.  A typical stack of the hung thread is given
	below.

	_swtch+0x138
	real_sleep+0x234
	_sleep+0x14
	syncip_flush_cache+0x190
	vx_flushdev+0x10
	vx_fsync+0x1cc
	spec_fsync+0x17c
	spec_inactive+0x14
	vn_rele+0x1e8
	vno_close+0x68
	closef+0x68
	close+0x30
	syscall+0x75c
	$syscallrtn+0x0

	(SR: 8606104228   CR: JAGab71614)

	I/O may give errors, even on success.

Defect Description:
	PHKL_22024:
	(SR: 8606144416   CR: JAGad13756)

	 Under some corner cases, some VxFS meta buffers
	(map buffers) will be left in a busy and dirty state.
	This leads to hang any process which is directly or
	indirectly doing a buffer cache flush.

	Resolution:

	 Make sure the VxFS meta buffers are flushed before doing
	a buffer cache flush.


	(SR: 8606104228   CR: JAGab71614)

	VxFS was not resetting the error code, while reusing a
	buffer for I/O.

	Resolution:

	Reset buffer error code, while reusing the buffer.

SR:
	8606144416 8606104228

Patch Files:
	/usr/conf/lib/libvxfs_base.a(vx_bio.o)

what(1) Output:
	/usr/conf/lib/libvxfs_base.a(vx_bio.o):
		vx_bio.c $Date: 2000/07/12 10:09:04 $ $Revision: 1.7
			.98.14 $ PATCH_10.20 (PHKL_22024)

cksum(1) Output:
	1129969503 10824 /usr/conf/lib/libvxfs_base.a(vx_bio.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_22025:
	s800: 10.20

	PHKL_14063:
	s800: 11.00

Patch Package Size: 70 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_22024

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_22024.depot

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHKL_22024.  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_22024.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_22024.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_16750 .
	For successful installation, please ensure that PHKL_16750
	is in the same depot with this patch, or PHKL_16750  is
	already installed.