Merge branch 'rickard/purge-hibernated-19/ERIERL-24/OTP-14444' into maint-19

* rickard/purge-hibernated-19/ERIERL-24/OTP-14444:
  Update testcase to check that purge handle hibernated process correct
  Do not GC hibernated process from other processes
  Fix check_process_code() on hibernated process

1 files changed, 41 insertions, 3 deletions

diff --git a/erts/emulator/test/code_SUITE.erl b/erts/emulator/test/code_SUITE.erl
index 3ee14f2d1c..1065b56e19 100644
--- a/erts/emulator/test/code_SUITE.erl
+++ b/erts/emulator/test/code_SUITE.erl
@@ -645,9 +645,40 @@ constant_pools(Config) when is_list(Config) ->
     erlang:purge_module(literals),
     OldHeap ! done,
     receive
-        {'EXIT',OldHeap,{A,B,C,[1,2,3|_]=Seq}} when length(Seq) =:= 16 ->
-            ok
-    end.
+	{'EXIT',OldHeap,{A,B,C,[1,2,3|_]=Seq}} when length(Seq) =:= 16 ->
+	    ok
+    end,
+
+    {module,literals} = erlang:load_module(literals, Code),
+    %% Have a hibernated process that references the literals
+    %% in the 'literals' module.
+    {Hib, Mon} = spawn_monitor(fun() -> hibernated(Self) end),
+    receive go -> ok end,
+    [{heap_size,OldHeapSz},
+     {total_heap_size,OldTotHeapSz}] = process_info(Hib, [heap_size,
+							  total_heap_size]),
+    OldHeapSz = OldTotHeapSz,
+    io:format("OldHeapSz=~p OldTotHeapSz=~p~n", [OldHeapSz, OldTotHeapSz]),
+    true = erlang:delete_module(literals),
+    false = erlang:check_process_code(Hib, literals),
+    erlang:check_process_code(self(), literals),
+    erlang:purge_module(literals),
+    receive after 1000 -> ok end,
+    [{heap_size,HeapSz},
+     {total_heap_size,TotHeapSz}] = process_info(Hib, [heap_size,
+						       total_heap_size]),
+    io:format("HeapSz=~p TotHeapSz=~p~n", [HeapSz, TotHeapSz]),
+    Hib ! hej,
+    receive
+	{'DOWN', Mon, process, Hib, Reason} ->
+	    {undef, [{no_module,
+		      no_function,
+		      [{A,B,C,[1,2,3|_]=Seq}], _}]} = Reason,
+	    16 = length(Seq)
+    end,
+    HeapSz = TotHeapSz, %% Ensure restored to hibernated state...
+    true = HeapSz > OldHeapSz,
+    ok.
 
 no_old_heap(Parent) ->
     A = literals:a(),
@@ -670,6 +701,13 @@ old_heap(Parent) ->
             exit(Res)
     end.
 
+hibernated(Parent) ->
+    A = literals:a(),
+    B = literals:b(),
+    Res = {A,B,literals:huge_bignum(),lists:seq(1, 16)},
+    Parent ! go,
+    erlang:hibernate(no_module, no_function, [Res]).
+
 create_old_heap() ->
     case process_info(self(), [heap_size,total_heap_size]) of
         [{heap_size,Sz},{total_heap_size,Total}] when Sz < Total ->