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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 Nov 2017
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Hector Martin

      for BIT in $(seq 0 31); do make clean && rm -f objs.txt && BIT=$BIT make -j9 && cp arch/x86/boot/bzImage kernel_${BIT}.bzimg && mv objs.txt objs_${BIT}.txt ; donehttps://twitter.com/marcan42/status/928571175210323968 …

      Hector Martin added,

      Hector Martin @marcan42
      I think I'm going to wrap gcc with a script that enables/disables that inlining mode depending on a given bit of the hash of the output object file name, then build a kernel for each bit, figure out if it crashes, and narrow down the culprit object file that way.
      Show this thread
      1 reply 6 retweets 18 likes
      Show this thread
    2. Hector Martin‏ @marcan42 9 Nov 2017
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      Finished building 32 kernels in 29 minutes. Time to test.

      2 replies 2 retweets 8 likes
      Show this thread
    3. Hector Martin‏ @marcan42 9 Nov 2017
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      • Report NetzDG Violation

      I expect 16/32 crashes on average; I'm at 8 so far after running through all kernels twice at 20 seconds per test. That narrows it down to 4 object files. The time to crash is nondeterministic, so let's go for a third run...

      2 replies 1 retweet 4 likes
      Show this thread
    4. shuffle2‏ @shuffle2 9 Nov 2017
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      Replying to @marcan42

      If only Linux had a decent debugger, eh?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Nov 2017
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      Replying to @shuffle2

      If only the golang runtime weren't an undebuggable mess. This is a *userspace* crash, and it's totally random messy crap. It's just somehow triggered by a kernel difference.

      9:53 AM - 9 Nov 2017
      0 replies 0 retweets 1 like

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