diff --git a/pkg/urbit/worker/main.c b/pkg/urbit/worker/main.c
index 0b7044769..5151dd775 100644
--- a/pkg/urbit/worker/main.c
+++ b/pkg/urbit/worker/main.c
@@ -406,12 +406,15 @@ _worker_lame(c3_d evt_d, u3_noun ovo, u3_noun why, u3_noun tan)
   }
   //  failed event notifications (%crud) are replaced with
   //  an even more generic notifications, on a generic arvo wire.
+  //  N.B this must not be allowed to fail!
   //
-  //    N.B this must not be allowed to fail!
+  //    [%warn original-event-tag=@tas combined-trace=(list tank)]
   //
   else if ( c3__crud == tag ) {
+    u3_noun lef = u3nc(c3__leaf, u3i_tape("crude crashed!"));
+    u3_noun nat = u3kb_weld(u3k(u3t(cad)), u3nc(lef, u3k(tan)));
     rep = u3nc(u3nt(u3_blip, c3__arvo, u3_nul),
-               u3nc(c3__warn, u3i_tape("crude crashed!")));
+               u3nt(c3__warn, u3k(u3h(cad)), nat));
   }
   //  failed failure failing fails
   //
@@ -421,11 +424,14 @@ _worker_lame(c3_d evt_d, u3_noun ovo, u3_noun why, u3_noun tan)
   }
   //  failure notifications are sent on the same wire
   //
+  //    [%crud event-tag=@tas event-trace=(list tank)]
+  //
   else {
     //  prepend failure mote to tank
     //
-    u3_noun tap = u3kb_weld(u3i_tape("bail: "), u3qc_rip(3, why));
-    u3_noun nat = u3nc(u3nc(c3__leaf, tap), u3k(tan));
+    u3_noun lef = u3nc(c3__leaf, u3kb_weld(u3i_tape("bail: "),
+                                           u3qc_rip(3, why)));
+    u3_noun nat = u3kb_weld(u3k(tan), u3nc(lef, u3_nul));
     rep = u3nc(u3k(wir), u3nt(c3__crud, u3k(tag), nat));
   }