Comment #18 on issue 3803 by [email protected]: Generators-iterators
mjsunit test fails flaky in deoptimizer on gc stress bot
https://code.google.com/p/v8/issues/detail?id=3803
Well, there are another 4 hours of my life I'll never get back. But at
least I figured out a completely insane bug, so I got that going for me:
1) Incremental marking cleared map in SharedFunctionInfo s, however it
was not enqueued as a flushing candidate because one JSFunction f1
still had optimized code.
2) Deoptimization of f1 made s eligible for code flushing.
3) Optimization of f2 added new entry to optimized code map of s.
4) The JSFunction f2 became unreachable and hence is never marked.
5) Incremental marking now visits f1, finds it eligible for flushing,
also s is eligible for flushing, both are enqueued.
6) Marking finishes, code flusher clears f1 and s, but the optimized
code map of s still contains an entry.
7) Boom!
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