Patch Name: PHKL_17526

Patch Description: s700 10.20 JFS sync/freeze 'dirty inval' panic patch

Creation Date: 99/02/01

Post Date:  99/02/02

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	JournalFS.VXFS-BASE-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
	Yes
	PHKL_17526: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_17526

Symptoms:
	PHKL_17526:
	SR: 1653285320 DTS: JAGaa44494
	System panics with "panic:  dirty inval" message.  A stack
	trace might look like:

	        panic+0x10
	        brelse+0x230
	        vx_brelse_bp+0x34
	        vx_brelse_noflush+0x34
	        vx_brelse+0x3c
	        vx_brelse_stale+0x2c
	        vx_blkinval+0x12c
	        vx_freeze_level+0x114
	        vx_freeze+0x10
	        vx_vfsfreeze+0x28
	        freeze_and_sync_fs_dev+0x38
	        lv_single_freeze_fs+0xd0
	        lv_realloclv+0x668
	        lv_ioctl+0x9bc
	        spec_ioctl+0xd4
	        vno_ioctl+0x98
	        ioctl+0x78
	        syscall+0x1a4
	        $syscallrtn+0x0

Defect Description:
	PHKL_17526:
	SR: 1653285320 DTS: JAGaa44494
	A JFS file system that is in the frozen state could have
	activity generated by a 'sync' system call.  This leaves
	some buffers in the 'invalid' (B_INVAL) and delayed write
	(B_DELWRI) state.  This causes a panic.

	Running the 'lvmerge' command and sync at the same time
	on the same file system might reproduce the problem.

	Resolution:
	Protect the 'vx_delxwri_flush_inode()' call in
	'vx_delxwri_flush()' with an ACTIVE1 level so that sync
	and freeze will coordinate.

SR:
	1653285320

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

what(1) Output:
	/usr/conf/lib/libvxfs_base.a(vx_iflush.o):
		vx_iflush.c $Date: 99/02/01 09:15:59 $ $Revision: 1.
			6.98.16 $ PATCH_10.20 (PHKL_17526)

cksum(1) Output:
	2002218658 29796 /usr/conf/lib/libvxfs_base.a(vx_iflush.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_17527:
	s800: 10.20

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_17526

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_17526.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_17526.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_17526.  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_17526.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_17526.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_16750 .
	For successful installation please insure that PHKL_16750
	is in the same depot with PHKL_17526, or PHKL_16750  is
	already installed.