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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 9 Jul 2020
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      Hector Martin Retweeted Erin  ✨ 💽

      This. I earned a reputation at my team at Google for debugging gnarly bugs. It was one of the most fun parts of the job. You've all seen that Go runtime bug story on my blog, which was after I left, but the stories inside were fun too. Highlights include: (thread)https://twitter.com/erincandescent/status/1281290723443294208 …

      Hector Martin added,

      Erin  ✨ 💽 @erincandescent
      This is by far one of the bits of engineering I find most fun, by the way! If someone offered me a job as "debugger of gnarly bugs and production incidents", I'd be very tempted by it! https://twitter.com/erincandescent/status/1281280157073002496 …
      3 replies 7 retweets 71 likes
      Show this thread
    2. Hector Martin‏ @marcan42 9 Jul 2020
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      Replicated and cross checked process randomly fails due to an *offset* (not data) mismatch between both replicas, on the order of once a petabyte. Cause: Google's internal optimized zlib implementation had a buffer overflow read that very rarely caused correct but *longer* output

      1 reply 2 retweets 23 likes
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    3. Hector Martin‏ @marcan42 9 Jul 2020
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      Service crashes upon receiving a protobuf with wrong schema. Root cause: producer server had kernel paniced, data not flushed to disk (but metadata was). On reboot picked up garbage sectors, happened to contain valid data from another process, format is self-synchronizing.

      1 reply 2 retweets 14 likes
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    4. Hector Martin‏ @marcan42 9 Jul 2020
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      Bonus points for debugging that one entirely from logs and records of a single occurrence (and concluding beyond reasonable doubt that that's what had happened based on stuff like suspect offsets lining up on 512 byte boundaries), plus sec impact (data was from another user).

      2 replies 1 retweet 16 likes
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    5. Hector Martin‏ @marcan42 9 Jul 2020
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      There was also another Go bug after I left, which someone said was breaking Google production. Cgo callbacks back into Go would transiently break stack tracing after returning, causing the garbage collector to explode if it ran with the right timing. Repro was tricky.

      1 reply 1 retweet 13 likes
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      Hector Martin‏ @marcan42 9 Jul 2020
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      Can't get away from fixing Google production even after you leave 😅

      7:54 PM - 9 Jul 2020
      • 1 Retweet
      • 21 Likes
      • which fox? witch fox avalon1982 Th0mms3n Francisco Barros Erin ✨💽 Henry Luna Marius Gedminas sww1235
      1 reply 1 retweet 21 likes
        1. New conversation
        1. Vyron Tsingaras‏ @vtsingaras 9 Jul 2020
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          Replying to @marcan42

          Do you have the bug numbers?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 9 Jul 2020
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          Replying to @vtsingaras

          golang/go#7978 for the Cgo issue, #20427 for the vDSO stack issue (the one from my blog). I don't have internal Google bug numbers for the others if that's what you're asking for, I no longer work there.

          0 replies 0 retweets 1 like
          3. End of conversation

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