Nonmoving GC regression due to TSAN
The TSAN rework (specifically aad1f803471fff1f187b0a0784dc38a867379847) introduced a subtle regression in `GC.c` with this hunk:
```patch
diff --git a/includes/rts/storage/GC.h b/includes/rts/storage/GC.h
index 9f4a0dde07..e8dc05048a 100644
--- a/includes/rts/storage/GC.h
+++ b/includes/rts/storage/GC.h
@@ -1694,8 +1695,8 @@ collect_pinned_object_blocks (void)
if (gen->large_objects != NULL) {
gen->large_objects->u.back = last;
}
- gen->large_objects = capabilities[n]->pinned_object_blocks;
- capabilities[n]->pinned_object_blocks = NULL;
+ g0->large_objects = RELAXED_LOAD(&capabilities[n]->pinned_object_blocks);
+ RELAXED_STORE(&capabilities[n]->pinned_object_blocks, NULL);
}
}
}
```
Note the `gen` turning into `g0`. This was almost certainly a rebasing mistake. This will need to be fixed and backported to %8.10.3 and %"9.0.1".
issue