[SystemSafety] A question about ISO26262

[David Haworth]

Hi everyone,

I've just been reading in detail the definition of freedom
from interference given in ISO26262, and it occurred to me
that the definition might not be exactly what was intended.

The following definitions are taken from ISO 26262-1:2011
but the 2016 edition is not significantly different.

"Freedon from interference" means:
  absence of cascading failures between two or more elements that
  could lead to the violation of a safety requirement

where a "cascading failure" is:
  failure of an element of an item causing another element or
  elements of the same item to fail

and "failure" means:
  termination of the ability of an element to perform a function
  as required

However, it is possible to imagine scenarios where, in the absence
of a protection mechanism, an element causes another element to fail
while still continuing to perform its own function flawlessly.

Any thoughts on the matter?

All the best,
Dave

-- 
David Haworth   OS Kernel Developer              david.haworth at elektrobit.com
Elektrobit Automotive GmbH                            Tel: +49 9131 7701-6154
Am Wolfsmantel 46, 91058 Erlangen, Germany            Fax: +49 9131 7701-6333
Geschäftsführer: Alexander Kocher, Gregor Zink     Amtsgericht Fürth HRB 4886
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