Today I noticed a random bit-flip for the third time in my life! A "5" was changed to a "7" in the bank account number on invoices I sent. That could have had pretty big consequences!! Luckily the number was on the invoice twice and the buyer noticed the two were different.
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Replying to @berendjanwever
Wow, I've never seen a bit flip in my life. Was it in a file (what type) or in a database? On a disk or in transit?
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Replying to @mkolsek
The first 2 were "in memory" changes to JavaScript during fuzzing; a bit flipped and turned "document" to something like "dpcument". That JS was static and not part of fuzzed data so my fuzzer reported an unexpected error, which is how I found out.
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Replying to @berendjanwever @mkolsek
I found out about this latest one because it was in a file. That file was generated from a template file, which also contained the flipped bit. So, it was either flipped on-disk in the template file or in memory when I last edited it and then saved to disk.
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From what I understand bit-flips in cheap non-ECC memory are not that uncommon. Especially if you "hammer" the memory :). I guess the high temperatures from fuzzing at 100% 24/7 also does not help. (The later does not apply to my desktop OC).
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