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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      My dear followers, are you in the right headspace to receive information about the Golang GC that could possibly hurt you?

      1 reply 2 retweets 39 likes
    2. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @erikcorry

      Bring it on. Nothing in GCs can hurt me more than it already did. Or so I think.

      2 replies 0 retweets 8 likes
    3. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @shipilev

      Sorry I don't have anything new for _you_. I just like the expression and it made me think of the GC ballast blog post and tearing fat pointers. You're cheating anyway because you weren't one of my followers when I wrote the tweet :-) https://en.wikipedia.org/wiki/Go_(programming_language)#Lack_of_race_condition_safety …

      1 reply 0 retweets 5 likes
    4. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @erikcorry

      Oh, so you are about to say that Golang GC is not safe under the races? That would be new for me!

      1 reply 0 retweets 1 like
    5. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @shipilev

      That's the sort of thing I might say, yes, but only if your headspace is ready.

      1 reply 0 retweets 0 likes
    6. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @erikcorry

      Oh please, I have been already educated that Swift's ARC corrupting the heap under the race (just like GC Handbook predicted it should) is okay and should not be the cause for concern. Seeing a tracing GC designed to fail the similar way would be interesting.

      1 reply 0 retweets 6 likes
    7. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @shipilev

      I did not know that! <the unplumbed depths of the human soul become visible> Apparently Go's memory safety in race conditions is "not a problem in practice" because they have a race detector.

      3 replies 0 retweets 3 likes
    8. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @erikcorry @shipilev

      https://research.swtch.com/gorace 

      1 reply 0 retweets 0 likes
    9. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @erikcorry @shipilev

      https://news.ycombinator.com/item?id=5759919 

      2 replies 0 retweets 0 likes
    10. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @erikcorry

      Ugh. I wonder if this is still true today! Having critical metadata spanning multiple words is downright odd, and basically quality-of-implementation issue. Hotspot does a few sacrifices to avoid this (e.g. aligning objects by 8 to have aligned headers).

      2 replies 0 retweets 1 like
      Patrick Walton‏ @pcwalton 7 Dec 2019
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      Replying to @shipilev @erikcorry

      Yes, it is still true today. The Go developers refuse to fix it even after a CTF came out in which contestants exploited a Go program using the technique I described there.

      10:21 PM - 7 Dec 2019
      • 2 Likes
      • Aleksey Shipilëv whitequark
      1 reply 0 retweets 2 likes
        1. Sanjay M.‏ @sjy 8 Dec 2019
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          Replying to @pcwalton @shipilev @erikcorry

          "refuse", lol. What a disingenuous statement. If you had attacker controlled Go code, you could just type the word unsafe and trivially create such an "exploit".

          0 replies 0 retweets 0 likes
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