diff options
Diffstat (limited to 'erts/emulator/test/system_info_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/system_info_SUITE.erl | 66 |
1 files changed, 62 insertions, 4 deletions
diff --git a/erts/emulator/test/system_info_SUITE.erl b/erts/emulator/test/system_info_SUITE.erl index 4e663fed7f..b48be3dd04 100644 --- a/erts/emulator/test/system_info_SUITE.erl +++ b/erts/emulator/test/system_info_SUITE.erl @@ -37,10 +37,13 @@ -export([process_count/1, system_version/1, misc_smoke_tests/1, heap_size/1, wordsize/1, memory/1, ets_limit/1, atom_limit/1, + procs_bug/1, ets_count/1, atom_count/1, system_logger/1]). -export([init/1, handle_event/2, handle_call/2]). +-export([init_per_testcase/2, end_per_testcase/2]). + suite() -> [{ct_hooks,[ts_install_cth]}, {timetrap, {minutes, 2}}]. @@ -48,8 +51,20 @@ suite() -> all() -> [process_count, system_version, misc_smoke_tests, ets_count, heap_size, wordsize, memory, ets_limit, atom_limit, atom_count, + procs_bug, system_logger]. + +init_per_testcase(procs_bug, Config) -> + procs_bug(init_per_testcase, Config); +init_per_testcase(_, Config) -> + Config. + +end_per_testcase(procs_bug, Config) -> + procs_bug(end_per_testcase, Config); +end_per_testcase(_, _) -> + ok. + %%% %%% The test cases ------------------------------------------------------------- %%% @@ -458,11 +473,16 @@ cmp_memory(MWs, Str) -> %% Total, processes, processes_used, and system will seldom %% give us exactly the same result since the two readings %% aren't taken atomically. + %% + %% Torerance is scaled according to the number of schedulers + %% to match spawn_mem_workers. - cmp_memory(total, EM, EDM, 1.05), - cmp_memory(processes, EM, EDM, 1.05), - cmp_memory(processes_used, EM, EDM, 1.05), - cmp_memory(system, EM, EDM, 1.05), + Tolerance = 1.05 + 0.01 * erlang:system_info(schedulers_online), + + cmp_memory(total, EM, EDM, Tolerance), + cmp_memory(processes, EM, EDM, Tolerance), + cmp_memory(processes_used, EM, EDM, Tolerance), + cmp_memory(system, EM, EDM, Tolerance), ok. @@ -649,3 +669,41 @@ handle_call(Msg, State) -> handle_event(Event, State) -> State ! {report_handler, Event}, {ok, State}. + + +%% OTP-15909: Provoke bug that would cause VM crash +%% if doing system_info(procs) when process have queued exit/down signals. +procs_bug(init_per_testcase, Config) -> + %% Use single scheduler and process prio to starve monitoring processes + %% from handling their received DOWN signals. + OldSchedOnline = erlang:system_flag(schedulers_online,1), + [{schedulers_online, OldSchedOnline} | Config]; +procs_bug(end_per_testcase, Config) -> + erlang:system_flag(schedulers_online, + proplists:get_value(schedulers_online, Config)), + ok. + +procs_bug(Config) when is_list(Config) -> + {Monee,_} = spawn_opt(fun () -> receive die -> ok end end, + [monitor,{priority,max}]), + Papa = self(), + Pids = [begin + P = spawn_opt(fun () -> + erlang:monitor(process, Monee), + Papa ! {self(),ready}, + receive "nada" -> no end + end, + [link, {priority,normal}]), + {P, ready} = receive M -> M end, + P + end + || _ <- lists:seq(1,10)], + process_flag(priority,high), + Monee ! die, + {'DOWN',_,process,Monee,normal} = receive M -> M end, + + %% This call did crash VM as Pids have pending DOWN signals. + erlang:system_info(procs), + process_flag(priority,normal), + [begin unlink(P), exit(P, kill) end || P <- Pids], + ok. |