Fix #3875: Crash in parallel GC, wrong pointer was being tested.

diff --git a/rts/sm/Evac.c b/rts/sm/Evac.c
index db24909..76026b0 100644 (file)
--- a/rts/sm/Evac.c
+++ b/rts/sm/Evac.c
@@ -878,7 +878,7 @@ selector_chain:
         } while (info_ptr == (W_)&stg_WHITEHOLE_info);
 
         // make sure someone else didn't get here first...
-        if (IS_FORWARDING_PTR(p) || 
+        if (IS_FORWARDING_PTR(info_ptr) || 
             INFO_PTR_TO_STRUCT(info_ptr)->type != THUNK_SELECTOR) {
             // v. tricky now.  The THUNK_SELECTOR has been evacuated
             // by another thread, and is now either a forwarding ptr or IND.