emkornfield commented on pull request #12216:
URL: https://github.com/apache/arrow/pull/12216#issuecomment-1023749294


   > Yeah I think it's something like that. Both the capacity_ and size_ of the 
null_bitmap buffer are 320, which to me suggests that ZeroPadding() might be 
failing to provide the null termination needed to separate these buffers. Does 
that sound plausible?
   
   ZeroPadding should be ensuring everything is zeroed at the end.  Based on 
the evidence I think this is quirk of how memory is getting re-used between by 
the memory allocator on each iteration.  I think there is probably a buffer 
overflow everytime.  it doesn't affect the first time through because the 
overflow is into blank memory or something like that.


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