[Crash-utility] Debugging Xen Hypervisor with 'crash' question...

[Roger Cruz]

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
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public
License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.  Enter "help copying" to see the conditions.
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
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
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

 

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