Catch exception to let original exception bubble fixes #8871

core/Db.php

@@ -708,11 +708,18 @@ class Db
 
     private static function logExtraInfoIfDeadlock($ex)
     {
-        if (self::get()->isErrNo($ex, 1213)) {
+        if (!self::get()->isErrNo($ex, 1213)) {
+            return;
+        }
+
+        try {
             $deadlockInfo = self::fetchAll("SHOW ENGINE INNODB STATUS");
 
             // log using exception so backtrace appears in log output
             Log::debug(new Exception("Encountered deadlock: " . print_r($deadlockInfo, true)));
+
+        } catch(\Exception $e) {
+            //  1227 Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
         }
     }