KDB breakpoint dead locks in SMP mode

[Keith Owens]

On Tue, 29 Jun 2004 10:08:34 +0200, 
Francois Wellenreiter <Francois.Wellenreiter at ext.bull.net> wrote:
>My conclusion is that we should make a global review on kdb working in 
>SMP mode.
>We should reconsider spin lock management, protection against IPI, CPU 
>state table
>management to be able to run breakpoints correctly in SMP mode.

You are quite corect.  This is a known problem with the current design
of kdb, concurrent breakpoints can deadlock.  Fixing this requires a
complete redesign of the kdb entry logic and will break all
architectures.  Unfortunately my past and current workload has never
left enough time to do this redesign.

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