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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
      • Report Tweet
      • 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. Hector Martin‏ @marcan42 9 Nov 2017
      • Report Tweet
      • Report NetzDG Violation

      🚨🚨🚨DING DING🚨🚨🚨 $ grep '^[0246][012389ab][0189][014589cd][028a][012389ab][014589cd]' objs_0.txt 6b9cab4f arch/x86/entry/vdso/vclock_gettime.o #yes, grep for bitops Who'd have thought a *userspace* crash would depend on a difference in vdso code... which is userspace code!

      4 replies 5 retweets 12 likes
      Show this thread
    5. MaxFragg‏ @Max_Krueger 9 Nov 2017
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      Replying to @marcan42

      gratulations! a bug in one of the obscurest parts of linux

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

      I don't know yet that this is a bug in Linux. All I know is this *difference* in Linux triggers a crash in the Go runtime. It could be Go's fault. In fact I've been betting it's Go's fault, and this makes me bet even harder :-)

      10:10 AM - 9 Nov 2017
      • 1 Like
      • Brad Fitzpatrick
      1 reply 0 retweets 1 like
        1. Hector Martin‏ @marcan42 9 Nov 2017
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          • Report NetzDG Violation
          Replying to @marcan42 @Max_Krueger

          Yeah it was Go's fault. Making assumptions about vDSO stack usage that are not documented and don't always hold.

          0 replies 0 retweets 1 like
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