1996, my colleagues trying to port Chorus microkernel on Cray supercomputer. System crashes every ~5 days with no apparent reason. After weeks of investigation someone notices one of the network cables slightly longer than others ... after ~5 days and speed of light the Cray would miss a clock tick and crashes. Replaced network cable and it works fine!

Don't mess with supercomputers ...

  • 4
    Wish I could mess with a Cray. 😀 The network cable length issue is sort of a Black Swan. I never would have noticed that but in hindsight...
  • 3
    coolest bug - all time
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