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From: Andreas Schwarz <freebsd.asc@strcmp.org>
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On 31.07.15, Andreas Schwarz wrote:
> On 30.07.15, Svatopluk Kraus wrote:

>> Yes, it did. I can't say from which revision it's happening. I try to
>> keep kernel updated with each change related to this problem, as I
>> hope that it helps. But the problem is still present.
>>
>> However, the kernels were built without INVARIANTS. Yesterday, I
>> prepared some debug patch which needed INVARIANTS anf KTR options and
>> the problem did not happen. The buildworld finished in about 15 hours
>> (taken from uptime) so it was about 2 hours faster then with kernel
>> before r285935.
>
> This could be important, my kernel config is also without INVARIANTS.

During the weekend I made some tests, the problem is also reproducable
with the standard RPI2 kernel config. Maybe not so often (but this is 
just a feeling).

-asc