Hi,

Lucene 10.3 is not yet out the door, but I’m back proposing yet another 
release! This time a bugfix release of 9.12.

My primary motivation for proposing this release is to resolve a number of 
issues related to sharing of arenas in our mmap implementation. Specifically:

 1. Reduce sharedArenaMaxPermits from 1024 to 64 (#15078)
 2. Use READONCE to read segment infos (#15074)
 3. Fix rare spin-loop in RefCountedSharedArena (#15112)

Any other potential bug fixes for 9.12.3?  I will try to find someone to be 
release manager or volunteer to do it myself if not. Let’s try to get an RC 
build out towards the end of next week, if possible.

-Chris.

P.S. I see that the following bug fix is already in branch_9_12 - Ensure vector 
queries handle advanceShallow correctly #14858

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