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authorLukas Larsson <[email protected]>2017-08-16 17:35:32 +0200
committerLukas Larsson <[email protected]>2017-08-16 17:35:32 +0200
commit33b3697ae98147e0470d8d08bca6c51042dcb3d1 (patch)
tree3b32fe07cf2d5e7767804633cdd70485d504e1e4 /erts
parent4b7e7fe427bb3e67e267e6cb8858a83921d8aca7 (diff)
parentb2f7b51f420a233a41c885d8b44919d88f1e7ba5 (diff)
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Merge branch 'lukas/erts/fix_dirty_trace_message_flush/OTP-14538' into maint
* lukas/erts/fix_dirty_trace_message_flush/OTP-14538: erts: Must have main lock when flushing trace messages
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/beam/erl_nif.c4
-rw-r--r--erts/emulator/beam/erl_process.c18
2 files changed, 13 insertions, 9 deletions
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index d3c5af3a83..9caeed3273 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -588,6 +588,10 @@ int erts_flush_trace_messages(Process *c_p, ErtsProcLocks c_p_locks)
ErlTraceMessageQueue *msgq, **last_msgq;
int reds = 0;
+ /* Only one thread at a time is allowed to flush trace messages,
+ so we require the main lock to be held when doing the flush */
+ ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(c_p);
+
erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_TRACE);
msgq = c_p->trace_msg_q;
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 359fd83522..63c838a91d 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -11777,9 +11777,11 @@ flush_dirty_trace_messages(void *vpid)
erts_free(ERTS_ALC_T_DIRTY_SL, vpid);
#endif
- proc = erts_proc_lookup(pid);
- if (proc)
- (void) erts_flush_trace_messages(proc, 0);
+ proc = erts_pid2proc_opt(NULL, 0, pid, ERTS_PROC_LOCK_MAIN, 0);
+ if (proc) {
+ (void) erts_flush_trace_messages(proc, ERTS_PROC_LOCK_MAIN);
+ erts_smp_proc_unlock(proc, ERTS_PROC_LOCK_MAIN);
+ }
}
#endif /* ERTS_DIRTY_SCHEDULERS */
@@ -14111,8 +14113,11 @@ erts_continue_exit_process(Process *p)
have none here */
}
+ erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN);
+ ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p);
+
#ifdef ERTS_SMP
- erts_flush_trace_messages(p, 0);
+ erts_flush_trace_messages(p, ERTS_PROC_LOCK_MAIN);
#endif
ERTS_TRACER_CLEAR(&ERTS_TRACER(p));
@@ -14120,11 +14125,6 @@ erts_continue_exit_process(Process *p)
if (!delay_del_proc)
delete_process(p);
-#ifdef ERTS_SMP
- erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN);
- ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p);
-#endif
-
return;
yield: