Tim Peters <t...@python.org> added the comment:

Also basic:  run hardware CPU and memory stress diagnostics, and/or try running 
the same thing on a different machine.  Hardware isn't infallible, and can fail 
in nearly arbitrary ways.  For example, perhaps a smidgen of silicon has gone 
flaky, so that one time in a billion bit 0 "leaks" into bit 1 in a register.  
That can effectively change the integer 1 to the integer 2.

Is that likely?  No.  But a loop doing mutually inconsistent things to the 
variables it's changing is impossible ;-)

----------
nosy: +tim.peters

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37168>
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