alt Hacker NewsAt Amazon we had a bug that was the result of a compiler bug and the behaviour of intel cores being mis-documented. It was intermittent and related to one core occasionally being allowed to access stale data in the cache. We debugged it with a logic analyzer, the commented nginx source and a copy of the C++ 11 spec.
It took longer than 2 days to fix.
Replies
amoss • yesterday at 7:10 AM
When you work on compilers, all bugs are compiler bugs.
(apart from the ones in the firmware, and the hardware glitches...)
auguzanellato • yesterday at 5:33 AM
What kind of LA did you use to de bug an Intel core?
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I’m old enough to have used ICEs to trace program execution.
They were damn cool. I seriously doubt that something like that, exists outside of a TSMC or Intel lab, these days.