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authorLukas Larsson <[email protected]>2017-10-12 09:52:14 +0200
committerLukas Larsson <[email protected]>2017-10-12 09:52:14 +0200
commitbecaa0972e42bb0ecedae3aeaba5be221a551fa4 (patch)
tree2b7db4074f94593dba5655757d76a1bfcbf8f86e /erts/emulator
parent1de63778d932f7ffdc72696fccfd825dbf457acd (diff)
parent5204e619ecc8394f399c6e40f15639dd379a9b91 (diff)
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Merge branch 'lukas/erts/tracing/recv_exit_signal_deadlock/OTP-14678' into maint
* lukas/erts/tracing/recv_exit_signal_deadlock/OTP-14678: erts: Fix lock order when recv tracing trapped exit signal
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/erl_process.c6
-rw-r--r--erts/emulator/test/trace_SUITE.erl33
2 files changed, 34 insertions, 5 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index b72bac00c1..1ce2b5071c 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -13307,9 +13307,9 @@ send_exit_signal(Process *c_p, /* current process if and only
if ((state & ERTS_PSFLG_TRAP_EXIT)
&& (reason != am_kill || (flags & ERTS_XSIG_FLG_IGN_KILL))) {
- /* have to release the status lock in order to send the exit message */
- erts_smp_proc_unlock(rp, *rp_locks & ERTS_PROC_LOCKS_XSIG_SEND);
- *rp_locks &= ~ERTS_PROC_LOCKS_XSIG_SEND;
+ /* have to release the status and trace lock in order to send the exit message */
+ erts_smp_proc_unlock(rp, *rp_locks & (ERTS_PROC_LOCKS_XSIG_SEND|ERTS_PROC_LOCK_TRACE));
+ *rp_locks &= ~(ERTS_PROC_LOCKS_XSIG_SEND|ERTS_PROC_LOCK_TRACE);
if (have_seqtrace(token) && token_update)
seq_trace_update_send(token_update);
if (is_value(exit_tuple))
diff --git a/erts/emulator/test/trace_SUITE.erl b/erts/emulator/test/trace_SUITE.erl
index 72acd33033..a81aa64057 100644
--- a/erts/emulator/test/trace_SUITE.erl
+++ b/erts/emulator/test/trace_SUITE.erl
@@ -38,7 +38,7 @@
system_monitor_long_gc_1/1, system_monitor_long_gc_2/1,
system_monitor_large_heap_1/1, system_monitor_large_heap_2/1,
system_monitor_long_schedule/1,
- bad_flag/1, trace_delivered/1]).
+ bad_flag/1, trace_delivered/1, trap_exit_self_receive/1]).
-include_lib("common_test/include/ct.hrl").
@@ -61,7 +61,8 @@ all() ->
more_system_monitor_args, system_monitor_long_gc_1,
system_monitor_long_gc_2, system_monitor_large_heap_1,
system_monitor_long_schedule,
- system_monitor_large_heap_2, bad_flag, trace_delivered].
+ system_monitor_large_heap_2, bad_flag, trace_delivered,
+ trap_exit_self_receive].
init_per_testcase(_Case, Config) ->
[{receiver,spawn(fun receiver/0)}|Config].
@@ -1709,6 +1710,31 @@ trace_delivered(Config) when is_list(Config) ->
ok
end.
+%% This testcase checks that receive trace works on exit signal messages
+%% when the sender of the exit signal is the process itself.
+trap_exit_self_receive(Config) ->
+ Parent = self(),
+ Proc = spawn_link(fun() -> process(Parent) end),
+
+ 1 = erlang:trace(Proc, true, ['receive']),
+ Proc ! {trap_exit_please, true},
+ {trace, Proc, 'receive', {trap_exit_please, true}} = receive_first_trace(),
+
+ %% Make the process call exit(self(), signal)
+ Reason1 = make_ref(),
+ Proc ! {exit_signal_please, Reason1},
+ {trace, Proc, 'receive', {exit_signal_please, Reason1}} = receive_first_trace(),
+ {trace, Proc, 'receive', {'EXIT', Proc, Reason1}} = receive_first_trace(),
+ receive {Proc, {'EXIT', Proc, Reason1}} -> ok end,
+ receive_nothing(),
+
+ unlink(Proc),
+ Reason2 = make_ref(),
+ Proc ! {exit_please, Reason2},
+ {trace, Proc, 'receive', {exit_please, Reason2}} = receive_first_trace(),
+ receive_nothing(),
+ ok.
+
drop_trace_until_down(Proc, Mon) ->
drop_trace_until_down(Proc, Mon, false, 0, 0).
@@ -1791,6 +1817,9 @@ process(Dest) ->
process(Dest);
{exit_please, Reason} ->
exit(Reason);
+ {exit_signal_please, Reason} ->
+ exit(self(), Reason),
+ process(Dest);
{trap_exit_please, State} ->
process_flag(trap_exit, State),
process(Dest);