On (03/06/19 11:07), Mikulas Patocka wrote:
> This bug only happens if we select large logbuffer (millions of
> characters). With smaller log buffer, there are messages "** X printk
> messages dropped", but there's no lockup.
>
> The kernel apparently puts 2 million characters into a console log buffer,
> then takes some lock and than tries to write all of them to a slow serial
> line.
Do you run a preemtible kernel?
-ss
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