Sorry if this is an obvious question but I’m new to the ‘crash’ utility.  I read Anderson’s white paper on crash and didn’t find any references to how to use ‘crash’ to debug the hypervisor.  I have crash running and accessing Domain 0’s kernel tasks and other variables, so I am comfortable thinking that I have the right setup.  I start crash with:

#crash xen-syms /dom0/proc/vmcore

And get the following output

#crash xen-syms /dom0/proc/vmcore
 
crash 4.0-4.7
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Copyright (C) 2005, 2006  Fujitsu Limited
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Copyright (C) 2005  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
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This program has absolutely no warranty.  Enter "help warranty" for details.
 
GNU gdb 6.1
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
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This GDB was configured as "i686-pc-linux-gnu"... 
 
   KERNEL: xen-syms
 DUMPFILE: /dom0/proc/vmcore
     CPUS: 4
  DOMAINS: 4
   UPTIME: 00:01:30
  MACHINE: Intel(R) Xeon(R) CPU            5140  @ 2.33GHz  (2327 Mhz)
   MEMORY: 4 GB
  PCPU-ID: 2
     PCPU: ff1bbfb4
  VCPU-ID: 0
     VCPU: ffbe6080  (VCPU_RUNNING)
DOMAIN-ID: 0
   DOMAIN: ff238080  (DOMAIN_RUNNING)
    STATE: CRASH

I would like to know what commands there are to examine the memory management system or any other internal data structures.  Also, how do I look at a stack trace in the hypervisor for a crash.  I tried the ‘gdb where’ command and it said no stack.

Thanks in advance.

Roger Cruz

Principal SW Engineer

Marathon Technologies Corp.

978-489-1153