Ruby » Ruby master

Bug #17636

Updated by peterzhu2118 (Peter Zhu) about 3 years ago

[GitHub PR](https://github.com/ruby/ruby/pull/4191) 

 When `RGENGC_CHECK_MODE` is enabled and we use multiple ractors, there is a race condition in `check_rvalue_consistency_force` that causes an assertion to fail. It happens when a page is created during the call to `is_pointer_to_heap`, which causes the binary search to fail. 

 # Reproduction 

 ```ruby 
 NUM_RACTORS = 10 

 rs = NUM_RACTORS.times.map do |i| 
   Ractor.new(i) do |i| 
     arr = [] 
    
     10_000.times do |j| 
       arr << "foo.#{i}.#{j}" 
     end 

     arr 
   end 
 end 

 arrs = rs.map { |r| r.take } 
 ``` 
 The crash log is attached below in `crash.log`. 

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