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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 4 Dec 2017
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      New blog post: Debugging an evil Go runtime bughttps://marcan.st/2017/12/debugging-an-evil-go-runtime-bug/ …

      11 replies 156 retweets 257 likes
    2. Vladimir Vukicevic‏Verified account @vvuk 4 Dec 2017
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      Replying to @marcan42

      I wonder if rr would have helped here? @rocallahan @khuey_

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 4 Dec 2017
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      Replying to @vvuk @rocallahan @khuey_

      If it doesn't make assumptions about stack layout or use of libc, then quite likely. I was going to mention reverse execution debugging as a powerful approach that might've worked but I wasn't sure of any examples.

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 4 Dec 2017
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      Replying to @marcan42 @vvuk and

      Ah, no. It emulates a single core machine. Wouldn't repro the failure, it requires multicore (not just multithread).

      3 replies 0 retweets 1 like
    5. Kyle Huey‏ @khuey_ 4 Dec 2017
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      Replying to @marcan42 @vvuk @rocallahan

      rr's chaos mode plays with thread scheduling enough that it might be able to tease out the bug anyways.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 4 Dec 2017
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      Replying to @khuey_ @vvuk @rocallahan

      The orq is atomic on a single core CPU, it's never going to race anything because it's a single instruction and you can't interrupt a thread in the middle of the orq.

      10:04 AM - 4 Dec 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Kyle Huey‏ @khuey_ 4 Dec 2017
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          Replying to @marcan42 @vvuk @rocallahan

          Isn't this just a straightforward out of bounds write? Why does racing matter at all?

          1 reply 0 retweets 0 likes
        2. Kyle Huey‏ @khuey_ 4 Dec 2017
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          Replying to @khuey_ @marcan42 and

          Ah I see, ok. Good times.

          1 reply 0 retweets 0 likes
        3. Show replies

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