[dm-devel] Serial console is causing system lock-up

[Theodore Y. Ts'o]

On Wed, Mar 06, 2019 at 11:07:55AM -0500, 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.

What are the messages; from what kernel subsystem?  Why are you seeing
so many log messages?

					- Ted