Author tim.peters
Recipients Phil Frost, facundobatista, mark.dickinson, rhettinger, skrah, tim.peters
Date 2019-06-06.04:58:09
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Message-id <1559797089.2.0.884659781596.issue37168@roundup.psfhosted.org>
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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 ;-)
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2019-06-06 04:58:09tim.peterssetrecipients: + tim.peters, rhettinger, facundobatista, mark.dickinson, skrah, Phil Frost
2019-06-06 04:58:09tim.peterssetmessageid: <1559797089.2.0.884659781596.issue37168@roundup.psfhosted.org>
2019-06-06 04:58:09tim.peterslinkissue37168 messages
2019-06-06 04:58:09tim.peterscreate