Call PERL_ASYNC_CHECK when we backtrack in the regex engine

Author: demerphq

regexec.c

@@ -8426,6 +8426,7 @@ NULL
 	    yes_state = st->u.yes.prev_yes_state;
 
 	state_num = st->resume_state + 1; /* failure = success + 1 */
+        PERL_ASYNC_CHECK();
 	goto reenter_switch;
     }
     result = 0;

t/re/pat.t

@@ -23,7 +23,7 @@ BEGIN {
     skip_all_without_unicode_tables();
 }
 
-plan tests => 789;  # Update this when adding/deleting tests.
+plan tests => 790;  # Update this when adding/deleting tests.
 
 run_tests() unless caller;
 
@@ -1758,6 +1758,16 @@ EOP
                 fresh_perl_is($code, $expect, {}, "$bug - $test_name" );
             }
         }
+        {
+            fresh_perl_is('
+                BEGIN{require q(test.pl);}
+                watchdog(3);
+                $SIG{ALRM} = sub {print "Timeout\n"; exit(1)};
+                alarm 1;
+                $_ = "a" x 1000 . "b" x 1000 . "c" x 1000;
+                /.*a.*b.*c.*[de]/;
+            ',"Timeout",{},"Test Perl 73464")
+        }
 } # End of sub run_tests
 
 1;