Excerpts from Bruce Guenter's message of 2011-08-01 18:59:15 -0400:
> On Mon, Aug 01, 2011 at 04:41:10PM -0600, cwillu wrote:
> > The keystroke should be alt-sysrq-w.
> 
> Right.  What I meant is that no backtraces are showing up.  I was
> actually using
> 
>     echo w > /proc/sysrq-trigger
> 
> and all I was seeing is:
> 
> SysRq : Show Blocked State
>   task                        PC stack   pid father
> 

# once per boot, run dmesg -n8
dmesg -n8

echo w > /proc/sysrq-trigger
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