panic: double fault with 11.0-CURRENT r258504

[Don Lewis]

On 27 Nov, Konstantin Belousov wrote:
> On Wed, Nov 27, 2013 at 12:22:27AM -0800, Don Lewis wrote:
>> It took a while, but I just got another double fault, though this one is
>> somewhat different.  This time it trapped in cpu_switch(), which
>> resulted in calls to
>> trap()->printf()->...->putchar()->msgbuf_addstr()->_mtx_lock_spin_flags()
>> where it trapped again.
>> 
>> Sitting at DDB prompt ...
> 
> Does 'show allpcpu' work ?

Yup.  For both CPUs, curthread == idlethread, both CPUs have the same
curpcb.  What is "dynamic pcpu"?  The values differ considerably between
the two CPUs.