kdump: quad core Opteron

[Chandru]

kdump on a quad core Opteron blade machine doesn't give a complete 
vmcore on the system.   All works well until we attempt to copy 
/proc/vmcore to some target place ( disk , n/w ). The system immediately 
resets without any OS messages after having copied few mb's of vmcore 
file.  Problem also occurs with 2.6.27-rc8 and latest kexec-tools.  If 
we pass 'mem=4G' as boot parameter to the first kernel, then kdump 
succeeds in copying a readable vmcore to /var/crash.

[root at abc ~]# uname -a
Linux abc 2.6.27-rc8 #2 SMP Tue Oct 7 08:05:46 EDT 2008 x86_64 x86_64 
x86_64 GNU/Linux

Chandru