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singleton method handle stack overflow #4003

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enebo opened this Issue Jul 8, 2016 · 2 comments

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enebo commented Jul 8, 2016

Boom singletons have some problem with indy:

jruby -I. -rbenchmark -e 'file = "./lib/ruby/stdlib/prime.rb"; 1000.times { puts Benchmark.measure { 20.times { load file } } }'
...
  0.170000   0.010000   0.180000 (  0.132127)
  0.190000   0.000000   0.190000 (  0.119628)
  0.130000   0.000000   0.130000 (  0.130361)
  0.230000   0.010000   0.240000 (  0.126183)
Error: Your application used more stack memory than the safety cap of 2048K.
Specify -J-Xss####k to increase it (#### = cap size in KB).
Specify -w for full java.lang.StackOverflowError stack trace
TRACE 305455:
    java.lang.invoke.LambdaForm$DMH.1072591677.invokeVirtual_L_L(LambdaForm$DMH:Unknown line)
    java.lang.invoke.LambdaForm$BMH.303563356.reinvoke(LambdaForm$BMH:Unknown line)
    java.lang.invoke.LambdaForm$MH.1123629720.exactInvoker(LambdaForm$MH:Unknown line)
    java.lang.invoke.LambdaForm$MH.917819120.guard(LambdaForm$MH:Unknown line)
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@enebo enebo added the invokedynamic label Jul 8, 2016

@enebo enebo added this to the JRuby 9.1.3.0 milestone Jul 8, 2016

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I can't reproduce this without singleton.rb. It seems to be an oddity tied to the fact that this benchmark repeatedly reopens and singletonizes the same class. It may not be a common pattern.

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headius commented Jul 8, 2016

I can't reproduce this without singleton.rb. It seems to be an oddity tied to the fact that this benchmark repeatedly reopens and singletonizes the same class. It may not be a common pattern.

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Ok, I found the issue. I knew it was there but did not realize it could cause this problem.

Constant caching for indy invalidates based on two things: global invalidation of that constant name, whenever a new value is set somewhere; and if the target module is different than the last time (for inheritance searches a la Foo::Bar). If we invalidate because we encountered a new time, we turn the constant site into a PIC and cache the new value along with previous ones. If we invalidate because of something global, we want to clear the site, since all cached values are now invalid.

The broken logic unfortunately just build a chained PIC endlessly for both invalidation cases. The one here is for normal constant lookup, which does both a lexical search and a hierarchy search (searchConst) and only invalidates globally. Every time the global invalidation fired, it caused the constant lookups in Singleton#included to add another link to the chain. The logic in singleton.rb triggered a global invalidation every time, so these cached links were all dead. Every lookup then had to traverse a longer and longer chain of invalidated SwitchPoint guards before caching again.

I have changes I'll push shortly that bring constant caching in line with method caching, which has invalidation and polymorphic limits.

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headius commented Jul 9, 2016

Ok, I found the issue. I knew it was there but did not realize it could cause this problem.

Constant caching for indy invalidates based on two things: global invalidation of that constant name, whenever a new value is set somewhere; and if the target module is different than the last time (for inheritance searches a la Foo::Bar). If we invalidate because we encountered a new time, we turn the constant site into a PIC and cache the new value along with previous ones. If we invalidate because of something global, we want to clear the site, since all cached values are now invalid.

The broken logic unfortunately just build a chained PIC endlessly for both invalidation cases. The one here is for normal constant lookup, which does both a lexical search and a hierarchy search (searchConst) and only invalidates globally. Every time the global invalidation fired, it caused the constant lookups in Singleton#included to add another link to the chain. The logic in singleton.rb triggered a global invalidation every time, so these cached links were all dead. Every lookup then had to traverse a longer and longer chain of invalidated SwitchPoint guards before caching again.

I have changes I'll push shortly that bring constant caching in line with method caching, which has invalidation and polymorphic limits.

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