MySQL 8.0.15 starts normally but any connection hangs
  
 
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 I dropped a large table (80G) Friday morning and got a crash:   InnoDB: ###### Diagnostic info printed to the standard error stream  2019-04-19T18:48:55.445507Z 0 [ERROR] [MY-012872] [InnoDB] Semaphore wait has lasted > 37617336 seconds. We intentionally crash the server because it appears to be hung.[FATAL] Semaphore wait has lasted > 600 seconds. We intentionally crash the server because it appears to be hung.  2019-04-19T18:48:55.445541Z 0 [ERROR] [MY-013183] [InnoDB] Assertion failure: ut0ut.cc:625 thread 140252955932416  InnoDB: We intentionally generate a memory trap.  InnoDB: Submit a detailed bug report to http://bugs.mysql.com.  InnoDB: If you g...