Commits on Jun 20, 2023

1. txn: update abort_old_txes to use locks …

   An execution of abort_old_txes could span multiple terms so the so the
   method could modify new state assuming it's the old state resulting in
   undefined behavior.
   
   This commit is the rewrite of the reverted f7fc026 in 11474. The pro-
   blem was caused by:
   
     - do_detach_partition got blocked
     - RP ignored blocked do_detach_partition and attempted next op leading
       double registration of the consumer groups ntp
   
   The op was blocked by a deadlock:
   
     - do_abort_old_txes was waiting for read lock while holding _gate
     - do_detach_partition was holding write lock while waiting to the
       gate to be closed
   
   This version doesn't wait for the read lock to become available and exit
   do_abort_old_txes releasing the _gate.
   
   It still isn't clear why RP ignored a blocked op

   

   rystsov committed Jun 20, 2023
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