code review 869045: runtime: fix bad status throw

src/pkg/runtime/mgc0.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // Garbage collector -- step 0.
 //
 // Stop the world, mark and sweep garbage collector.
 // NOT INTENDED FOR PRODUCTION USE.
 //
 // A mark and sweep collector provides a way to exercise
@@ skipping 117 matching lines @@
                 case Gdead:
                         break;
                 case Grunning:
                         if(gp != g)
                                 throw("mark - world not stopped");
                         scanstack(gp);
                         break;
                 case Grunnable:
                 case Gsyscall:
                 case Gwaiting:
+                case Grecovery:
                         scanstack(gp);
                         break;
                 }
         }
 
         // mark things pointed at by objects with finalizers
         walkfintab(markfin);
 }
 
 // free RefNone, free & queue finalizers for RefNone|RefHasFinalizer, reset RefSome
@@ skipping 207 matching lines @@
                         *(void**)frame = f->arg;
                         reflect·call((byte*)f->fn, frame, sizeof(uintptr) + f->nret);
                         free(frame);
                         f->fn = nil;
                         f->arg = nil;
                         f->next = nil;
                 }
                 gc(1);  // trigger another gc to clean up the finalized objects, if possible
         }
 }