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|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(seq_trace_SUITE).
%% label_capability_mismatch needs to run a part of the test on an OTP 20 node.
-compile(r20).
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
init_per_testcase/2,end_per_testcase/2]).
-export([token_set_get/1, tracer_set_get/1, print/1,
send/1, distributed_send/1, recv/1, distributed_recv/1,
trace_exit/1, distributed_exit/1, call/1, port/1,
match_set_seq_token/1, gc_seq_token/1, label_capability_mismatch/1,
send_literal/1,inherit_on_spawn/1,spawn_flag/1]).
%% internal exports
-export([simple_tracer/2, one_time_receiver/0, one_time_receiver/1,
start_tracer/0, stop_tracer/1,
do_match_set_seq_token/1, do_gc_seq_token/1, countdown_start/2]).
-include_lib("common_test/include/ct.hrl").
-define(TIMESTAMP_MODES, [no_timestamp,
timestamp,
monotonic_timestamp,
strict_monotonic_timestamp]).
suite() ->
[{ct_hooks,[ts_install_cth]},
{timetrap,{minutes,1}}].
all() ->
[token_set_get, tracer_set_get, print, send, send_literal,
distributed_send, recv, distributed_recv, trace_exit,
distributed_exit, call, port, match_set_seq_token,
gc_seq_token, label_capability_mismatch,
inherit_on_spawn, spawn_flag].
groups() ->
[].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
init_per_testcase(_Case, Config) ->
Config.
end_per_testcase(_Case, _Config) ->
ok.
%% Verifies that the set_token and get_token functions work as expected
token_set_get(Config) when is_list(Config) ->
do_token_set_get(timestamp),
do_token_set_get(monotonic_timestamp),
do_token_set_get(strict_monotonic_timestamp).
-define(SEQ_TRACE_SEND, 1). %(1 << 0)
-define(SEQ_TRACE_RECEIVE, 2). %(1 << 1)
-define(SEQ_TRACE_PRINT, 4). %(1 << 2)
-define(SEQ_TRACE_NOW_TIMESTAMP, 8). %(1 << 3)
-define(SEQ_TRACE_STRICT_MON_TIMESTAMP, 16). %(1 << 4)
-define(SEQ_TRACE_MON_TIMESTAMP, 32). %(1 << 5)
-define(SEQ_TRACE_SPAWN, 64). %(1 << 6)
do_token_set_get(TsType) ->
BaseOpts = ?SEQ_TRACE_SEND bor
?SEQ_TRACE_RECEIVE bor
?SEQ_TRACE_PRINT bor
?SEQ_TRACE_SPAWN,
Flags = case TsType of
timestamp ->
BaseOpts bor ?SEQ_TRACE_NOW_TIMESTAMP;
strict_monotonic_timestamp ->
BaseOpts bor ?SEQ_TRACE_STRICT_MON_TIMESTAMP;
monotonic_timestamp ->
BaseOpts bor ?SEQ_TRACE_MON_TIMESTAMP
end,
ct:pal("Type ~p, flags = ~p~n", [TsType, Flags]),
Self = self(),
seq_trace:reset_trace(),
%% Test that initial seq_trace is disabled
[] = seq_trace:get_token(),
%% Test setting and reading the different fields
0 = seq_trace:set_token(label,{my_label,1}),
{label,{my_label,1}} = seq_trace:get_token(label),
false = seq_trace:set_token(print,true),
{print,true} = seq_trace:get_token(print),
false = seq_trace:set_token(send,true),
{send,true} = seq_trace:get_token(send),
false = seq_trace:set_token(spawn,true),
{spawn,true} = seq_trace:get_token(spawn),
false = seq_trace:set_token('receive',true),
{'receive',true} = seq_trace:get_token('receive'),
false = seq_trace:set_token(TsType,true),
{TsType,true} = seq_trace:get_token(TsType),
%% Check the whole token
{Flags,{my_label,1},0,Self,0} = seq_trace:get_token(), % all flags are set
%% Test setting and reading the 'serial' field
{0,0} = seq_trace:set_token(serial,{3,5}),
{serial,{3,5}} = seq_trace:get_token(serial),
%% Check the whole token, test that a whole token can be set and get
{Flags,{my_label,1},5,Self,3} = seq_trace:get_token(),
seq_trace:set_token({Flags,19,7,Self,5}),
{Flags,19,7,Self,5} = seq_trace:get_token(),
%% Check that receive timeout does not reset token
receive after 0 -> ok end,
{Flags,19,7,Self,5} = seq_trace:get_token(),
%% Check that token can be unset
{Flags,19,7,Self,5} = seq_trace:set_token([]),
[] = seq_trace:get_token(),
%% Check that Previous serial counter survived unset token
0 = seq_trace:set_token(label, 17),
{0,17,0,Self,5} = seq_trace:get_token(),
%% Check that reset_trace resets the token and clears
%% the Previous serial counter
seq_trace:reset_trace(),
[] = seq_trace:get_token(),
0 = seq_trace:set_token(label, 19),
{0,19,0,Self,0} = seq_trace:get_token(),
%% Cleanup
seq_trace:reset_trace(),
ok.
tracer_set_get(Config) when is_list(Config) ->
Self = self(),
seq_trace:set_system_tracer(self()),
Self = seq_trace:get_system_tracer(),
Self = seq_trace:set_system_tracer(false),
false = seq_trace:get_system_tracer(),
%% Set the system tracer to a port.
Port = load_tracer(Config),
seq_trace:set_system_tracer(Port),
Port = seq_trace:get_system_tracer(),
Port = seq_trace:set_system_tracer(false),
false = seq_trace:get_system_tracer(),
ok.
print(Config) when is_list(Config) ->
lists:foreach(fun do_print/1, ?TIMESTAMP_MODES).
do_print(TsType) ->
start_tracer(),
set_token_flags([print, TsType]),
seq_trace:print(0,print1),
seq_trace:print(1,print2),
seq_trace:print(print3),
seq_trace:reset_trace(),
[{0,{print,_,_,[],print1}, Ts0},
{0,{print,_,_,[],print3}, Ts1}] = stop_tracer(2),
check_ts(TsType, Ts0),
check_ts(TsType, Ts1).
send(Config) when is_list(Config) ->
lists:foreach(fun do_send/1, ?TIMESTAMP_MODES).
do_send(TsType) ->
do_send(TsType, send).
do_send(TsType, Msg) ->
seq_trace:reset_trace(),
start_tracer(),
Receiver = spawn(?MODULE,one_time_receiver,[]),
Label = make_ref(),
seq_trace:set_token(label,Label),
set_token_flags([send, TsType]),
Receiver ! Msg,
Self = self(),
seq_trace:reset_trace(),
[{Label,{send,_,Self,Receiver,Msg}, Ts}] = stop_tracer(1),
check_ts(TsType, Ts).
%% This testcase tests that we do not segfault when we have a
%% literal as the message and the message is copied onto the
%% heap during a GC.
send_literal(Config) when is_list(Config) ->
lists:foreach(fun do_send_literal/1,
[atom, make_ref(), ets:new(hej,[]), 1 bsl 64,
"gurka", {tuple,test,with,#{}}, #{}]).
do_send_literal(Msg) ->
N = 10000,
seq_trace:reset_trace(),
start_tracer(),
Label = make_ref(),
seq_trace:set_token(label,Label),
set_token_flags([send, 'receive', no_timestamp]),
Receiver = spawn_link(fun() -> receive ok -> ok end end),
[Receiver ! Msg || _ <- lists:seq(1, N)],
erlang:garbage_collect(Receiver),
[Receiver ! Msg || _ <- lists:seq(1, N)],
erlang:garbage_collect(Receiver),
Self = self(),
seq_trace:reset_trace(),
[{Label,{send,_,Self,Receiver,Msg}, Ts} | _] = stop_tracer(N),
check_ts(no_timestamp, Ts).
distributed_send(Config) when is_list(Config) ->
lists:foreach(fun do_distributed_send/1, ?TIMESTAMP_MODES).
do_distributed_send(TsType) ->
{ok,Node} = start_node(seq_trace_other,[]),
{_,Dir} = code:is_loaded(?MODULE),
Mdir = filename:dirname(Dir),
true = rpc:call(Node,code,add_patha,[Mdir]),
seq_trace:reset_trace(),
start_tracer(),
Receiver = spawn(Node,?MODULE,one_time_receiver,[]),
%% Make sure complex labels survive the trip.
Label = make_ref(),
seq_trace:set_token(label,Label),
set_token_flags([send,TsType]),
Receiver ! send,
Self = self(),
seq_trace:reset_trace(),
stop_node(Node),
[{Label,{send,_,Self,Receiver,send}, Ts}] = stop_tracer(1),
check_ts(TsType, Ts).
recv(Config) when is_list(Config) ->
lists:foreach(fun do_recv/1, ?TIMESTAMP_MODES).
do_recv(TsType) ->
seq_trace:reset_trace(),
start_tracer(),
Receiver = spawn(?MODULE,one_time_receiver,[]),
set_token_flags(['receive',TsType]),
Receiver ! 'receive',
%% let the other process receive the message:
receive after 1 -> ok end,
Self = self(),
seq_trace:reset_trace(),
[{0,{'receive',_,Self,Receiver,'receive'}, Ts}] = stop_tracer(1),
check_ts(TsType, Ts).
distributed_recv(Config) when is_list(Config) ->
lists:foreach(fun do_distributed_recv/1, ?TIMESTAMP_MODES).
do_distributed_recv(TsType) ->
{ok,Node} = start_node(seq_trace_other,[]),
{_,Dir} = code:is_loaded(?MODULE),
Mdir = filename:dirname(Dir),
true = rpc:call(Node,code,add_patha,[Mdir]),
seq_trace:reset_trace(),
rpc:call(Node,?MODULE,start_tracer,[]),
Receiver = spawn(Node,?MODULE,one_time_receiver,[]),
%% Make sure complex labels survive the trip.
Label = make_ref(),
seq_trace:set_token(label,Label),
set_token_flags(['receive',TsType]),
Receiver ! 'receive',
%% let the other process receive the message:
receive after 1 -> ok end,
Self = self(),
seq_trace:reset_trace(),
Result = rpc:call(Node,?MODULE,stop_tracer,[1]),
stop_node(Node),
ok = io:format("~p~n",[Result]),
[{Label,{'receive',_,Self,Receiver,'receive'}, Ts}] = Result,
check_ts(TsType, Ts).
trace_exit(Config) when is_list(Config) ->
lists:foreach(fun do_trace_exit/1, ?TIMESTAMP_MODES).
do_trace_exit(TsType) ->
seq_trace:reset_trace(),
start_tracer(),
Receiver = spawn_link(?MODULE, one_time_receiver, [exit]),
process_flag(trap_exit, true),
%% Make sure complex labels survive the trip.
Label = make_ref(),
seq_trace:set_token(label,Label),
set_token_flags([send, TsType]),
Receiver ! {before, exit},
%% let the other process receive the message:
receive
{'EXIT', Receiver, {exit, {before, exit}}} ->
seq_trace:set_token([]);
Other ->
seq_trace:set_token([]),
ct:fail({received, Other})
end,
Self = self(),
Result = stop_tracer(2),
seq_trace:reset_trace(),
ok = io:format("~p~n", [Result]),
[{Label, {send, {0,1}, Self, Receiver, {before, exit}}, Ts0},
{Label, {send, {1,2}, Receiver, Self,
{'EXIT', Receiver, {exit, {before, exit}}}}, Ts1}] = Result,
check_ts(TsType, Ts0),
check_ts(TsType, Ts1).
distributed_exit(Config) when is_list(Config) ->
lists:foreach(fun do_distributed_exit/1, ?TIMESTAMP_MODES).
do_distributed_exit(TsType) ->
{ok, Node} = start_node(seq_trace_other, []),
{_, Dir} = code:is_loaded(?MODULE),
Mdir = filename:dirname(Dir),
true = rpc:call(Node, code, add_patha, [Mdir]),
seq_trace:reset_trace(),
rpc:call(Node, ?MODULE, start_tracer,[]),
Receiver = spawn_link(Node, ?MODULE, one_time_receiver, [exit]),
process_flag(trap_exit, true),
set_token_flags([send, TsType]),
Receiver ! {before, exit},
%% let the other process receive the message:
receive
{'EXIT', Receiver, {exit, {before, exit}}} ->
seq_trace:set_token([]);
Other ->
seq_trace:set_token([]),
ct:fail({received, Other})
end,
Self = self(),
Result = rpc:call(Node, ?MODULE, stop_tracer, [1]),
seq_trace:reset_trace(),
stop_node(Node),
ok = io:format("~p~n", [Result]),
[{0, {send, {1, 2}, Receiver, Self,
{'EXIT', Receiver, {exit, {before, exit}}}}, Ts}] = Result,
check_ts(TsType, Ts).
label_capability_mismatch(Config) when is_list(Config) ->
Releases = ["20_latest"],
Available = [Rel || Rel <- Releases, test_server:is_release_available(Rel)],
case Available of
[] -> {skipped, "No incompatible releases available"};
_ ->
lists:foreach(fun do_incompatible_labels/1, Available),
lists:foreach(fun do_compatible_labels/1, Available),
ok
end.
do_incompatible_labels(Rel) ->
Cookie = atom_to_list(erlang:get_cookie()),
{ok, Node} = test_server:start_node(
list_to_atom(atom_to_list(?MODULE)++"_"++Rel), peer,
[{args, " -setcookie "++Cookie}, {erl, [{release, Rel}]}]),
{_,Dir} = code:is_loaded(?MODULE),
Mdir = filename:dirname(Dir),
true = rpc:call(Node,code,add_patha,[Mdir]),
seq_trace:reset_trace(),
true = is_pid(rpc:call(Node,?MODULE,start_tracer,[])),
Receiver = spawn(Node,?MODULE,one_time_receiver,[]),
%% This node does not support arbitrary labels, so it must fail with a
%% timeout as the token is dropped silently.
seq_trace:set_token(label,make_ref()),
seq_trace:set_token('receive',true),
Receiver ! 'receive',
%% let the other process receive the message:
receive after 10 -> ok end,
seq_trace:reset_trace(),
{error,timeout} = rpc:call(Node,?MODULE,stop_tracer,[1]),
stop_node(Node),
ok.
do_compatible_labels(Rel) ->
Cookie = atom_to_list(erlang:get_cookie()),
{ok, Node} = test_server:start_node(
list_to_atom(atom_to_list(?MODULE)++"_"++Rel), peer,
[{args, " -setcookie "++Cookie}, {erl, [{release, Rel}]}]),
{_,Dir} = code:is_loaded(?MODULE),
Mdir = filename:dirname(Dir),
true = rpc:call(Node,code,add_patha,[Mdir]),
seq_trace:reset_trace(),
true = is_pid(rpc:call(Node,?MODULE,start_tracer,[])),
Receiver = spawn(Node,?MODULE,one_time_receiver,[]),
%% This node does not support arbitrary labels, but small integers should
%% still work.
Label = 1234,
seq_trace:set_token(label,Label),
seq_trace:set_token('receive',true),
Receiver ! 'receive',
%% let the other process receive the message:
receive after 10 -> ok end,
Self = self(),
seq_trace:reset_trace(),
Result = rpc:call(Node,?MODULE,stop_tracer,[1]),
stop_node(Node),
ok = io:format("~p~n",[Result]),
[{Label,{'receive',_,Self,Receiver,'receive'}, _}] = Result,
ok.
call(doc) ->
"Tests special forms {is_seq_trace} and {get_seq_token} "
"in trace match specs.";
call(Config) when is_list(Config) ->
Self = self(),
seq_trace:reset_trace(),
TrA = transparent_tracer(),
1 =
erlang:trace(Self, true,
[call, set_on_spawn, {tracer, TrA(pid)}]),
1 =
erlang:trace_pattern({?MODULE, call_tracee_1, 1},
[{'_',
[],
[{message, {{{self}, {get_seq_token}}}}]}],
[local]),
1 =
erlang:trace_pattern({?MODULE, call_tracee_2, 1},
[{'_',
[{is_seq_trace}],
[{message, {{{self}, {get_seq_token}}}}]}],
[local]),
RefA = make_ref(),
Pid2A = spawn_link(
fun() ->
receive {_, msg, RefA} -> ok end,
RefA = call_tracee_2(RefA),
Self ! {self(), msg, RefA}
end),
Pid1A = spawn_link(
fun() ->
receive {_, msg, RefA} -> ok end,
RefA = call_tracee_1(RefA),
Pid2A ! {self(), msg, RefA}
end),
Pid1A ! {Self, msg, RefA},
%% The message is passed Self -> Pid1B -> Pid2B -> Self.
%% Traced functions are called in Pid1B and Pid2B.
receive {Pid2A, msg, RefA} -> ok end,
%% Only call_tracee1 will be traced since the guard for
%% call_tracee2 requires a sequential trace. The trace
%% token is undefined.
Token2A = [],
{ok, [{trace, Pid1A, call,
{?MODULE, call_tracee_1, [RefA]},
{Pid1A, Token2A}}]} =
TrA({stop, 1}),
seq_trace:reset_trace(),
TrB = transparent_tracer(),
1 =
erlang:trace(Self, true,
[call, set_on_spawn, {tracer, TrB(pid)}]),
RefB = make_ref(),
Pid2B = spawn_link(
fun() ->
receive {_, msg, RefB} -> ok end,
RefB = call_tracee_2(RefB),
Self ! {self(), msg, RefB}
end),
Pid1B = spawn_link(
fun() ->
receive {_, msg, RefB} -> ok end,
RefB = call_tracee_1(RefB),
Pid2B ! {self(), msg, RefB}
end),
%% The token is set *AFTER* spawning to make sure we're testing that the
%% token follows on send and not that it inherits on spawn.
Label = 17,
seq_trace:set_token(label, Label),
Pid1B ! {Self, msg, RefB},
%% The message is passed Self -> Pid1B -> Pid2B -> Self, and the
%% seq_trace token follows invisibly. Traced functions are
%% called in Pid1B and Pid2B. Seq_trace flags == 0 so no
%% seq_trace messages are generated.
receive {Pid2B, msg, RefB} -> ok end,
%% The values of these counters {.., 1, _, 0}, {.., 2, _, 1}
%% depend on that seq_trace has been reset just before this test.
Token1B = {0, Label, 1, Self, 0},
Token2B = {0, Label, 2, Pid1B, 1},
{ok, [{trace, Pid1B, call,
{?MODULE, call_tracee_1, [RefB]},
{Pid1B, Token1B}},
{trace, Pid2B, call,
{?MODULE, call_tracee_2, [RefB]},
{Pid2B, Token2B}}]} =
TrB({stop,2}),
seq_trace:reset_trace(),
ok.
%% The token should follow spawn, just like it follows messages.
inherit_on_spawn(Config) when is_list(Config) ->
seq_trace:reset_trace(),
start_tracer(),
Ref = make_ref(),
seq_trace:set_token(label,Ref),
set_token_flags([send]),
Self = self(),
Other = spawn(fun() -> Self ! {gurka,Ref} end),
receive {gurka,Ref} -> ok end,
seq_trace:reset_trace(),
[{Ref,{send,_,Other,Self,{gurka,Ref}}, _Ts}] = stop_tracer(1),
ok.
spawn_flag(Config) when is_list(Config) ->
seq_trace:reset_trace(),
start_tracer(),
Ref = make_ref(),
seq_trace:set_token(label,Ref),
set_token_flags([spawn]),
Self = self(),
{serial,{0,0}} = seq_trace:get_token(serial),
%% The serial number is bumped on spawning (just like message passing), so
%% our child should inherit a counter of 1.
ProcessA = spawn(fun() ->
{serial,{0,1}} = seq_trace:get_token(serial),
Self ! {a,Ref}
end),
receive {a,Ref} -> ok end,
{serial,{1,2}} = seq_trace:get_token(serial),
ProcessB = spawn(fun() ->
{serial,{2,3}} = seq_trace:get_token(serial),
Self ! {b,Ref}
end),
receive {b,Ref} -> ok end,
{serial,{3,4}} = seq_trace:get_token(serial),
seq_trace:reset_trace(),
[{Ref,{spawn,{0,1},Self,ProcessA,[]}, _Ts},
{Ref,{spawn,{2,3},Self,ProcessB,[]}, _Ts}] = stop_tracer(2),
ok.
%% Send trace messages to a port.
port(Config) when is_list(Config) ->
lists:foreach(fun (TsType) -> do_port(TsType, Config) end,
?TIMESTAMP_MODES).
do_port(TsType, Config) ->
io:format("Testing ~p~n",[TsType]),
Port = load_tracer(Config),
seq_trace:set_system_tracer(Port),
set_token_flags([print, TsType]),
Small = [small,term],
seq_trace:print(0, Small),
case get_port_message(Port) of
{seq_trace,0,{print,_,_,[],Small}} when TsType == no_timestamp ->
ok;
{seq_trace,0,{print,_,_,[],Small},Ts0} when TsType /= no_timestamp ->
check_ts(TsType, Ts0),
ok;
Other ->
seq_trace:reset_trace(),
ct:fail({unexpected,Other})
end,
%% OTP-4218 Messages from ports should not affect seq trace token.
%%
%% Check if trace token still is active on this process after
%% the get_port_message/1 above that receives from a port.
OtherSmall = [other | Small],
seq_trace:print(0, OtherSmall),
seq_trace:reset_trace(),
case get_port_message(Port) of
{seq_trace,0,{print,_,_,[],OtherSmall}} when TsType == no_timestamp ->
ok;
{seq_trace,0,{print,_,_,[],OtherSmall}, Ts1} when TsType /= no_timestamp ->
check_ts(TsType, Ts1),
ok;
Other1 ->
ct:fail({unexpected,Other1})
end,
seq_trace:set_token(print, true),
Huge = huge_data(),
seq_trace:print(0, Huge),
seq_trace:reset_trace(),
case get_port_message(Port) of
{seq_trace,0,{print,_,_,[],Huge}} ->
ok;
Other2 ->
ct:fail({unexpected,Other2})
end,
unlink(Port),
exit(Port,kill),
ok.
get_port_message(Port) ->
receive
{Port,{data,Bin}} when is_binary(Bin) ->
binary_to_term(Bin);
Other ->
ct:fail({unexpected,Other})
after 5000 ->
ct:fail(timeout)
end.
match_set_seq_token(doc) ->
["Tests that match spec function set_seq_token does not "
"corrupt the heap"];
match_set_seq_token(Config) when is_list(Config) ->
Parent = self(),
%% OTP-4222 Match spec 'set_seq_token' corrupts heap
%%
%% This test crashes the emulator if the bug in question is present,
%% it is therefore done in a slave node.
%%
%% All the timeout stuff is here to get decent accuracy of the error
%% return value, instead of just 'timeout'.
%%
{ok, Sandbox} = start_node(seq_trace_other, []),
true = rpc:call(Sandbox, code, add_patha,
[filename:dirname(code:which(?MODULE))]),
Lbl = 4711,
%% Do the possibly crashing test
P1 =
spawn(
fun () ->
Parent ! {self(),
rpc:call(Sandbox,
?MODULE, do_match_set_seq_token, [Lbl])}
end),
%% Probe the node with a simple rpc request, to see if it is alive.
P2 =
spawn(
fun () ->
receive after 4000 -> ok end,
Parent ! {self(), rpc:call(Sandbox, erlang, abs, [-1])}
end),
%% If the test node hangs completely, this timer expires.
R3 = erlang:start_timer(8000, self(), void),
%%
{ok, Log} =
receive
{P1, Result} ->
exit(P2, done),
erlang:cancel_timer(R3),
Result;
{P2, 1} ->
exit(P1, timeout),
erlang:cancel_timer(R3),
{error, "Test process hung"};
{timeout, R3, _} ->
exit(P1, timeout),
exit(P2, timeout),
{error, "Test node hung"}
end,
%% Sort the log on Pid, as events from different processes
%% are not guaranteed to arrive in a certain order to the
%% tracer
SortedLog = lists:keysort(2, Log),
ok = check_match_set_seq_token_log(Lbl, SortedLog),
%%
stop_node(Sandbox),
ok.
%% OTP-4222 Match spec 'set_seq_token' corrupts heap
%%
%% The crashing test goes as follows:
%%
%% One trigger function calls match spec function {set_seq_token, _, _},
%% which when faulty corrupts the heap. It is assured that the process
%% in question has a big heap and recently garbage collected so there
%% will be room on the heap, which is necessary for the crash to happen.
%%
%% Then two processes bounces a few messages between each other, and if
%% the heap is crashed the emulator crashes, or the triggering process's
%% loop data gets corrupted so the loop never ends.
do_match_set_seq_token(Label) ->
seq_trace:reset_trace(),
Tr = transparent_tracer(),
TrPid = Tr(pid),
erlang:trace_pattern({?MODULE, '_', '_'},
[{'_',
[{is_seq_trace}],
[{message, {get_seq_token}}]}],
[local]),
erlang:trace_pattern({?MODULE, countdown, 2},
[{'_',
[],
[{set_seq_token, label, Label},
{message, {get_seq_token}}]}],
[local]),
erlang:trace(new, true, [call, {tracer, TrPid}]),
Ref = make_ref(),
Bounce = spawn(fun () -> bounce(Ref) end),
Mref = erlang:monitor(process, Bounce),
_Countdown = erlang:spawn_opt(?MODULE, countdown_start, [Bounce, Ref],
[{min_heap_size, 4192}]),
receive
{'DOWN', Mref, _, _, normal} ->
Result = Tr({stop, 0}),
seq_trace:reset_trace(),
erlang:trace(new, false, [call]),
Result;
{'DOWN', Mref, _, _, Reason} ->
Tr({stop, 0}),
seq_trace:reset_trace(),
erlang:trace(new, false, [call]),
{error, Reason}
end.
check_match_set_seq_token_log(
Label,
[{trace,B,call,{?MODULE,bounce, [Ref]}, {0,Label,2,B,1}},
{trace,B,call,{?MODULE,bounce, [Ref]}, {0,Label,4,B,3}},
{trace,B,call,{?MODULE,bounce, [Ref]}, {0,Label,6,B,5}},
{trace,C,call,{?MODULE,countdown,[B,Ref]}, {0,Label,0,C,0}},
{trace,C,call,{?MODULE,countdown,[B,Ref,3]},{0,Label,0,C,0}},
{trace,C,call,{?MODULE,countdown,[B,Ref,2]},{0,Label,2,B,1}},
{trace,C,call,{?MODULE,countdown,[B,Ref,1]},{0,Label,4,B,3}},
{trace,C,call,{?MODULE,countdown,[B,Ref,0]},{0,Label,6,B,5}}
]) ->
ok;
check_match_set_seq_token_log(_Label, Log) ->
{error, Log}.
countdown_start(Bounce, Ref) ->
%% This gc and the increased heap size of this process ensures that
%% the match spec executed for countdown/2 has got heap space for
%% the trace token, so the heap gets trashed according to OTP-4222.
erlang:garbage_collect(),
countdown(Bounce, Ref).
countdown(Bounce, Ref) ->
countdown(Bounce, Ref, 3).
countdown(Bounce, Ref, 0) ->
Bounce ! Ref;
countdown(Bounce, Ref, Cnt) ->
Tag = make_ref(),
Bounce ! {Ref, self(), {Tag, Cnt}},
receive {Tag, Cnt} -> countdown(Bounce, Ref, Cnt-1) end.
bounce(Ref) ->
receive
Ref ->
ok;
{Ref, Dest, Msg} ->
Dest ! Msg,
bounce(Ref)
end.
gc_seq_token(doc) ->
["Tests that a seq_trace token on a message in the inqueue ",
"can be garbage collected."];
gc_seq_token(Config) when is_list(Config) ->
Parent = self(),
%% OTP-4555 Seq trace token causes free mem read in gc
%%
%% This test crashes the emulator if the bug in question is present,
%% it is therefore done in a slave node.
%%
%% All the timeout stuff is here to get decent accuracy of the error
%% return value, instead of just 'timeout'.
%%
{ok, Sandbox} = start_node(seq_trace_other, []),
true = rpc:call(Sandbox, code, add_patha,
[filename:dirname(code:which(?MODULE))]),
Label = 4711,
%% Do the possibly crashing test
P1 =
spawn(
fun () ->
Parent ! {self(),
rpc:call(Sandbox,
?MODULE, do_gc_seq_token, [Label])}
end),
%% Probe the node with a simple rpc request, to see if it is alive.
P2 =
spawn(
fun () ->
receive after 4000 -> ok end,
Parent ! {self(), rpc:call(Sandbox, erlang, abs, [-1])}
end),
%% If the test node hangs completely, this timer expires.
R3 = erlang:start_timer(8000, self(), void),
%%
ok =
receive
{P1, Result} ->
exit(P2, done),
erlang:cancel_timer(R3),
Result;
{P2, 1} ->
exit(P1, timeout),
erlang:cancel_timer(R3),
{error, "Test process hung"};
{timeout, R3, _} ->
exit(P1, timeout),
exit(P2, timeout),
{error, "Test node hung"}
end,
%%
stop_node(Sandbox),
ok.
do_gc_seq_token(Label) ->
Parent = self(),
Comment =
{"OTP-4555 Seq trace token causes free mem read in gc\n"
"\n"
"The crashing test goes as follows:\n"
"\n"
"Put a message with seq_trace token in the inqueue,\n"
"Grow the process heap big enough to become mmap'ed\n"
"and force a garbage collection using large terms\n"
"to get a test_heap instruction with a big size value.\n"
"Then try to trick the heap into shrinking.\n"
"\n"
"All this to make the GC move the heap between memory blocks.\n"},
seq_trace:reset_trace(),
Child = spawn_link(
fun() ->
receive {Parent, no_seq_trace_token} -> ok end,
do_grow(Comment, 256*1024, []),
do_shrink(10),
receive {Parent, seq_trace_token} -> ok end,
Parent ! {self(), {token, seq_trace:get_token(label)}}
end),
seq_trace:set_token(label, Label),
Child ! {Parent, seq_trace_token},
seq_trace:set_token([]),
Child ! {Parent, no_seq_trace_token},
receive
{Child, {token, {label, Label}}} ->
ok;
{Child, {token, Other}} ->
{error, Other}
end.
do_grow(_, 0, Acc) ->
Acc;
do_grow(E, N, Acc) ->
do_grow(E, N-1, [E | Acc]).
do_shrink(0) ->
ok;
do_shrink(N) ->
erlang:garbage_collect(),
do_shrink(N-1).
%% Test that messages from a port does not clear the token
port_clean_token(Config) when is_list(Config) ->
seq_trace:reset_trace(),
Label = make_ref(),
seq_trace:set_token(label, Label),
{label,Label} = seq_trace:get_token(label),
%% Create a port and get messages from it
%% We use os:cmd as a convenience as it does
%% open_port, port_command, port_close and receives replies.
%% Maybe it is not ideal to rely on the internal implementation
%% of os:cmd but it will have to do.
os:cmd("ls"),
%% Make sure that the seq_trace token is still there
{label,Label} = seq_trace:get_token(label),
ok.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Internal help functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Call trace targets
call_tracee_1(X) ->
X.
call_tracee_2(X) ->
X.
transparent_tracer() ->
Ref = make_ref(),
Loop =
fun(Fun, Log, LN) ->
receive
{stop, MinLN, Ref, From} when LN >= MinLN ->
From ! {log, Ref, lists:reverse(Log)};
Entry when is_tuple(Entry) == false; element(1, Entry) /= stop ->
Fun(Fun, [Entry | Log], LN+1)
end
end,
Self = self(),
Pid =
spawn(fun() ->
seq_trace:set_system_tracer(self()),
Self ! {started, Ref},
Loop(Loop, [], 0)
end),
receive {started, Ref} -> ok end,
fun(pid) ->
Pid;
({stop, N}) when is_integer(N), N >= 0 ->
Mref = erlang:monitor(process, Pid),
receive
{'DOWN', Mref, _, _, _} ->
{error, not_started}
after 0 ->
DeliverRef = erlang:trace_delivered(all),
receive
{trace_delivered,_,DeliverRef} -> ok
end,
Pid ! {stop, N, Ref, self()},
receive {'DOWN', Mref, _, _, _} -> ok end,
receive {log, Ref, Log} ->
{ok, Log}
end
end
end.
one_time_receiver() ->
receive _Term -> ok
end.
one_time_receiver(exit) ->
receive Term ->
exit({exit, Term})
end.
simple_tracer(Data, DN) ->
receive
{seq_trace,Label,Info,Ts} ->
simple_tracer([{Label,Info,Ts}|Data], DN+1);
{seq_trace,Label,Info} ->
simple_tracer([{Label,Info, no_timestamp}|Data], DN+1);
{stop,N,From} when DN >= N ->
From ! {tracerlog,lists:reverse(Data)}
end.
stop_tracer(N) when is_integer(N) ->
case catch (seq_trace_SUITE_tracer ! {stop,N,self()}) of
{'EXIT', _} ->
{error, not_started};
_ ->
receive
{tracerlog,Data} ->
Data
after 1000 ->
{error,timeout}
end
end.
start_tracer() ->
stop_tracer(0),
Pid = spawn(?MODULE,simple_tracer,[[], 0]),
register(seq_trace_SUITE_tracer,Pid),
seq_trace:set_system_tracer(Pid),
Pid.
set_token_flags([]) ->
ok;
set_token_flags([no_timestamp|Flags]) ->
seq_trace:set_token(timestamp, false),
seq_trace:set_token(monotonic_timestamp, false),
seq_trace:set_token(strict_monotonic_timestamp, false),
set_token_flags(Flags);
set_token_flags([Flag|Flags]) ->
seq_trace:set_token(Flag, true),
set_token_flags(Flags).
check_ts(no_timestamp, Ts) ->
try
no_timestamp = Ts
catch
_ : _ ->
ct:fail({unexpected_timestamp, Ts})
end,
ok;
check_ts(timestamp, Ts) ->
try
{Ms,S,Us} = Ts,
true = is_integer(Ms),
true = is_integer(S),
true = is_integer(Us)
catch
_ : _ ->
ct:fail({unexpected_timestamp, Ts})
end,
ok;
check_ts(monotonic_timestamp, Ts) ->
try
true = is_integer(Ts)
catch
_ : _ ->
ct:fail({unexpected_timestamp, Ts})
end,
ok;
check_ts(strict_monotonic_timestamp, Ts) ->
try
{MT, UMI} = Ts,
true = is_integer(MT),
true = is_integer(UMI)
catch
_ : _ ->
ct:fail({unexpected_timestamp, Ts})
end,
ok.
start_node(Name, Param) ->
test_server:start_node(Name, slave, [{args, Param}]).
stop_node(Node) ->
test_server:stop_node(Node).
load_tracer(Config) ->
Path = proplists:get_value(data_dir, Config),
ok = erl_ddll:load_driver(Path, echo_drv),
open_port({spawn,echo_drv}, [eof,binary]).
huge_data() -> huge_data(16384).
huge_data(0) -> [];
huge_data(N) when N rem 2 == 0 ->
P = huge_data(N div 2),
[P|P];
huge_data(N) ->
P = huge_data(N div 2),
[16#1234566,P|P].
|