uschindler commented on issue #12916:
URL: https://github.com/apache/lucene/issues/12916#issuecomment-1861877749

   Hi,
   The proposed fix is looking fine to me. Please note that all other 
accessible methods in that class are synchronized (or private ones implicitly 
synchronized as only called from synchronized ones).
   
   Just this one isn't and this causes trouble.
   
   I think the fix mentioned here is fine and fixes a real bug which may also 
happen on Hotspot on some other hardware platform. It does not fail on x86 with 
hotspot. ARM could fail due to other memory behaviour and order.
   
   I will provide a PR to add synchronized tomorrow.


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