ADD 799238 - RAM disk driver breaks locking hierarchy

[pv@xxxxxxxxxxxxx (dxm@xxxxxxxxxxxx)]

View Incident: 
http://co-op.engr.sgi.com/BugWorks/code/bwxquery.cgi?search=Search&wlong=1&view_type=Bug&wi=799238

 Status : open                         Priority : 2                         
 Assigned Engineer : dxm               Submitter : dxm                      
*Modified User : dxm                  *Modified User Domain : engr          
*Description :
OK, so this one is repeatable now, and it looks like an
interraction between the ramdisk driver and XFS.

        2 way SMP 1400 with 1Gb memory, 
        SCSI disk. 
        t-o-t kernel, kio _not_ enabled.
        
setup:

        mkfs -t xfs -f /dev/sdc5

.....


==========================
ADDITIONAL INFORMATION (ADD)
From: dxm@engr (BugWorks)
Date: Aug 23 2000 06:08:57PM
==========================


Modid:  2.4.0-test1-xfs:slinx:72912a
Date:  Wed Aug 23 18:06:56 PDT 2000
Workarea:  snort:/build1/people/dxm/isms/slinx-xfs-bruce
Author:  dxm

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.0-test1-xfs

linux/drivers/block/rd.c - 1.22
        - SMP deadlock fix from Neil Brown <neilb@xxxxxxxxxxxxxxx>
          (to be submitted for inclusion in kernel)

This fixes the problem, but I'll close this once it gets posted
to the kernel list.