Engineer on @googlechrome. Involved in CSS and W3C standards. Previously @mozilla, @w3ctag. Mastodon: @dbaron@w3c.social
Rockville, Maryland, USA
Joined March 2008
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British Mus. V&A. Natl Prtrt Gallery. Tate Mod'n. British Library. Greenwich obsrvtry. Hampton Court Palace. Oxford. Cambridge. Winchester.
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But I don't actually remember if any of the real bugs we found dented the crash rates. (Pretty sure I never checked for most recent round.)
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... & that are that large. Given that we did eventually find real bugs around the old stuff, this may be real bugs too.
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Not sure we can say "probably", but there's certainly a nonzero expected rate of hardware-related crashes for hashtables used that heavily.
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Also (a bit off topic), crashes that are actually CPU bugs, like bugzil.la/772330 bugzil.la/1296630 (PGO involved in both too)
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Probably a bigger source of crashes than memory→register pattern above is bitflips in the binary on disk, like bugzil.la/1272750
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Of course, now that this stuff is all "in the cloud" it's presumably much harder to track stuff like that down.
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For similar issues in our own infrastructure, see bugzil.la/787281 , where I found intermittent CI failures due to bad hardware.
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Hard to say if this sort of thing is 5% of crashes or 25% of crashes, but anecdotally (from crashes I've looked at closely) it's nontrivial.
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I've seen last few instructions copying pointer from stack to register & dereferencing it, with stack & register dump showing 1 bit flipped.
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When you closely analyze crash reports from a product as widely used as Firefox, some of the corruption is clearly hardware.
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Will Advanced Protection support Firefox soon after it ships support for security keys? So many Google services are becoming Chrome-only...
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Saying that certain CSS properties are secure-context-only is easy. I'm a little more uneasy about more granular features.
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When there are faregates you can't walk 4 flights of stairs past where you should have paid and then figure out you need to go back.
My first DLR trip in London was a Tube (has faregates) to DLR (doesn't) transfer. Walked up huge stairway 2x after forgetting to tap out.
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See Tokyo, where the gates open instantly, and tickets can go in in any orientation (and stacked, if multiple).
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Good fare gates make it harder to forget to pay by accident (or misunderstand how), but don't slow riders down.
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Is it more or less than the percentage that consider traffic from random Ethernet jacks in public areas of the office to be trusted?
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