Hi Dave,
 I attempted to try your suggested commands, but it tends to fail on my 
 machine:
 
 
 libl041:/var/log/dump # crash -s vmlinux.sles10sp2.smp.x86_64 
 2008-08-08-23\:27/vmcore
 crash> struct ext3_xattr_search
 struct: invalid data structure reference: ext3_xattr_search
 crash> mod -s ext3
      MODULE       NAME                   SIZE  OBJECT FILE
 ffffffff8856a500  ext3                 153360  
 /lib/modules/2.6.16.60-0.21-smp/kernel/fs/ext3/ext3.ko
 crash> struct ext3_xattr_search
 struct: invalid data structure reference: ext3_xattr_search
 crash> struct ext3_xattr_info
 struct: invalid data structure reference: ext3_xattr_info
 
 
 crash> sys
       KERNEL: vmlinux.sles10sp2.smp.x86_64
     DUMPFILE: 2008-08-08-23:27/vmcore
         CPUS: 4
         DATE: Fri Aug  8 23:20:09 2008
       UPTIME: 01:31:48
 LOAD AVERAGE: 2.48, 1.32, 0.56
        TASKS: 157
     NODENAME: libl041
      RELEASE: 2.6.16.60-0.21-smp
      VERSION: #1 SMP Tue May 6 12:41:02 UTC 2008
      MACHINE: x86_64  (1995 Mhz)
       MEMORY: 3.9 GB
        PANIC: "Oops: 0000 [1] SMP " (check log for details)
 
 crash version: 4.0-4.10   gdb version: 6.1
 
 I tried the same after compiling and installing the latest crash version 
 (crash version: 4.0-6.3   gdb version: 6.1) with no difference in results.
 
 What would you suggest?
 
 Thanks
 Durga 
The first thing to verify is whether those two structures existed
in the 2.6.16-era timeframe?
Dave