So, r331464 crashes in the same place, on my system.  r331064 still boots OK.  
I'll keep searching.

One week ago there was a change to randomdev to poll for signals every so 
often, as a defence against very large reads.  That wouldn't have introduced a 
race somewhere,
or left things in an unexpected state, perhaps?  That change (r331070) by cem@ 
is just a few revisions after the one that is working for me.  I'll start 
looking there...

Cheers,

Andrew

On Sun, Mar 25, 2018 at 07:49:17AM +1100, Andrew Reilly wrote:
> Hi Warner,
> 
> The breakage was in 331470,  and at least one version earlier, that I updated 
> past when it panicked.
> 
> I'm guessing that kdb's inability to dump would be down to it not having 
> found any disk devices yet, right?  So yes, bisecting to narrow down the 
> issue is probably the best bet.  I'll try your r331464: if that works that 
> leaves only four or five revisions.  Of course the breakage could be hardware 
> specific.
> 
> Cheers,
> -- 
> Andrew
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