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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. Maciej Sinilo‏ @msinilo 4 Dec 2017
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      Debugging an evil Go runtime bug - https://marcan.st/2017/12/debugging-an-evil-go-runtime-bug/ …

      2 replies 6 retweets 13 likes
    2. Bruce Dawson (Antifa)‏ @BruceDawson0xB 5 Dec 2017
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      Replying to @msinilo

      That was an awesome investigation. My conclusion would be that the Go Runtime is unnecessarily creating stacks without guard pages, thus bringing back Stack Clash - and this bug was just a side-effect

      1 reply 0 retweets 3 likes
    3. Arseny Kapoulkine‏ @zeuxcg 5 Dec 2017
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      Replying to @BruceDawson0xB @msinilo

      I believe it's by design - Go uses very small growable stacks, and the overhead of allocating *and* marking the entire page after each stack as unmapped would significantly impact performance/memory on some workloads.

      1 reply 0 retweets 0 likes
    4. Bruce Dawson (Antifa)‏ @BruceDawson0xB 5 Dec 2017
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      Replying to @zeuxcg @msinilo

      It does sound like it's by design, I just think it's excessively risky design. The Go Runtime also works around its own scheduler weaknesses by raising windows timer frequency. It seems very old-school for a newish language

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 5 Dec 2017
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      Replying to @BruceDawson0xB @zeuxcg @msinilo

      Go shouldn't be overflowing its stacks since it dynamically grows them. The stupid thing here was calling into C code without switching into a C-compatible stack. Last time I found a Go runtime bug it was in the (normal) C interop too. Go has serious issues with C FFI.

      8:18 PM - 5 Dec 2017
      0 replies 0 retweets 0 likes

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