Various "ThreadSafe" mojo_public_bindings_unittests flaking on Fuchsia |
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Issue descriptionAssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr flakes mojo_public_bindings_unittests sometimes. This is from the Fuchsia waterfall, but is very likely all-platforms. e.g. https://build.chromium.org/p/chromium.fyi/builders/Fuchsia/builds/8150 [00006.248] 02579.02638> [ RUN ] AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr [00006.248] 02579.02638> ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1076: Failure [00006.248] 02579.02638> Expected: thread_id [00006.248] 02579.02638> Which is: -297440464 [00006.248] 02579.02638> To be equal to: base::PlatformThread::CurrentId() [00006.248] 02579.02638> Which is: -1305060560
,
Aug 3 2017
While trying to repro that one, I hit another that looks very similar: [00034.935] 28184.28211> [ RUN ] InterfacePtrTest.ThreadSafeInterfacePointer/0 [00034.965] 28184.28366> ../../mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc:866: Failure [00034.965] 28184.28366> Expected: thread_id [00034.965] 28184.28366> Which is: 1875790640 [00034.965] 28184.28366> To be equal to: base::PlatformThread::CurrentId() [00034.965] 28184.28366> Which is: 885644080
,
Aug 3 2017
expectations are indeed being violated:
[00004.853] 04675.04710> [ RUN ] AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr
[00004.879] 04675.04819> [3:1405717296:0803/195521.683607:4879072:ERROR:associated_interface_unittest.cc(1081)] outer: 29082629278512
[00004.885] 04675.04829> [3:-1623995600:0803/195521.690339:4885395:ERROR:associated_interface_unittest.cc(1076)] inner: 126704206203696
[00004.889] 04675.04829> ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1077: Failure
[00004.889] 04675.04829> Expected: thread_id
[00004.889] 04675.04829> Which is: 1405717296
[00004.889] 04675.04829> To be equal to: base::PlatformThread::CurrentId()
[00004.889] 04675.04829> Which is: -1623995600
with
sgraham@river:/work/cr/src$ git diff origin/master mojo/public/cpp/bindings/tests/associated_interface_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/associated_interface_unittest.cc b/mojo/public/cpp/bindings/tests/associated_interface_unittest.cc
index 1238e54..62e13d9 100644
--- a/mojo/public/cpp/bindings/tests/associated_interface_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/associated_interface_unittest.cc
@@ -1073,10 +1073,12 @@ TEST_F(AssociatedInterfaceTest, ThreadSafeAssociatedInterfacePtr) {
base::PlatformThreadId thread_id, int32_t result) {
EXPECT_EQ(123, result);
// Validate the callback is invoked on the calling thread.
+ LOG(ERROR) << "inner: " << pthread_self();
EXPECT_EQ(thread_id, base::PlatformThread::CurrentId());
// Notify the run_loop to quit.
main_task_runner->PostTask(FROM_HERE, quit_closure);
});
+ LOG(ERROR) << "outer: " << pthread_self();
(*thread_safe_sender)
->Echo(123,
base::Bind(done_callback, main_task_runner, quit_closure,
I'm a little suspicious of the SequenceTaskRunnerHandle::Get() atm, but that's idle speculation still. I'm not sure what's going on.
,
Aug 3 2017
There is nothing requiring a SequencedTaskRunner to be implemented using a single thread - that's a property of SingleThreadTaskRunner. If this test is running in an environment which sets up the SequencedTaskRunner using a worker-pool, or the TaskScheduler, then it'll be one of these non-thread-affine ones, and testing thread-Ids will flake depending on how things happen to run.
,
Aug 3 2017
Caught it doing something fishy (the crash is induced). "here0" means that SequencedTaskRunnerHandle::Get() returned here https://cs.chromium.org/chromium/src/base/threading/sequenced_task_runner_handle.cc?rcl=6f408527d1887f3a3ed57a001c35fc61c91c6aef&l=38 which is a ThreadTaskRunnerHandle::Get() which is thread-affine. This is the case that almost always happens. "here1" is very rare, and means https://cs.chromium.org/chromium/src/base/threading/sequenced_task_runner_handle.cc?rcl=6f408527d1887f3a3ed57a001c35fc61c91c6aef&l=47 which is from a pool and is a sequence, not a thread, and is when the test fails. [00004.935] 04647.04674> [ RUN ] AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr [00004.945] 04647.04674> [3:1550207792:0803/202958.807103:4945168:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.946] 04647.04674> [3:1550207792:0803/202958.808228:4946293:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.947] 04647.04674> [3:1550207792:0803/202958.809330:4947394:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.948] 04647.04674> [3:1550207792:0803/202958.810217:4948903:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.950] 04647.04674> [3:1550207792:0803/202958.812637:4950702:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.951] 04647.04674> [3:1550207792:0803/202958.813523:4951587:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.953] 04647.04674> [3:1550207792:0803/202958.815074:4953139:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.954] 04647.04674> [3:1550207792:0803/202958.816064:4954128:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.956] 04647.04674> [3:1550207792:0803/202958.818508:4956573:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.958] 04647.04674> [3:1550207792:0803/202958.820388:4958452:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.961] 04647.04674> [3:1550207792:0803/202958.823370:4961435:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.965] 04647.04674> [3:1550207792:0803/202958.827711:4965775:ERROR:sequenced_task_runner_handle.cc(38)] here0 [00004.971] 04647.04794> [3:1405717296:0803/202958.833256:4971320:ERROR:associated_interface_unittest.cc(1086)] outer: 29082629278512 [00004.973] 04647.04794> [3:1405717296:0803/202958.834874:4972939:ERROR:sequenced_task_runner_handle.cc(47)] here1 [00004.978] 04647.04804> [3:-1623995600:0803/202958.839695:4977759:ERROR:associated_interface_unittest.cc(1076)] inner: 126704206203696 [00004.981] 04647.04804> ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1078: Failure [00004.981] 04647.04804> Value of: equal [00004.981] 04647.04804> Actual: false [00004.981] 04647.04804> Expected: true [00004.982] 04647.04804> ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1079: Failure [00004.982] 04647.04804> Expected: thread_id [00004.982] 04647.04804> Which is: 1405717296 [00004.982] 04647.04804> To be equal to: base::PlatformThread::CurrentId() [00004.982] 04647.04804> Which is: -1623995600 [00004.986] 01105.01144> <== fatal exception: process [4647] thread [4804] [00004.986] 01105.01144> <== fatal page fault, PC at 0x945321a9811 [00004.986] 01105.01144> CS: 0 RIP: 0x945321a9811 EFL: 0xa87 CR2: 0x2a [00004.986] 01105.01144> RAX: 0x41 RBX: 0x397c25b05060 RCX: 0x2 RDX: 0x2 [00004.986] 01105.01144> RSI: 0x397c25b05 RDI: 0x395a57b11c98 RBP: 0x4f33858790e8 RSP: 0x4f33858790b0 [00004.986] 01105.01144> R8: 0x310 R9: 0x397c25b0 R10: 0x3981afe5eec0 R11: 0x8000000000000000 [00004.986] 01105.01144> R12: 0x9f33cb30 R13: 0x53c98b30 R14: 0x39f8a951d030 R15: 0x39f8a951d028 [00004.986] 01105.01144> errc: 0x6 [00004.986] 01105.01144> bottom of user stack: [00004.987] 01105.01144> 0x00004f33858790b0: c6e21900 00004010 00000000 00000000 |.....@..........| [00004.987] 01105.01144> 0x00004f33858790c0: 00000000 00000000 c6e21ab8 53c98b30 |............0..S| [00004.987] 01105.01144> 0x00004f33858790d0: 25af8060 0000397c c6dd3805 0000007b |`..%|9...8..{...| [00004.987] 01105.01144> 0x00004f33858790e0: 00000000 00000000 25af8060 0000397c |........`..%|9..| [00004.987] 01105.01144> 0x00004f33858790f0: 00000000 00000000 00000000 00000000 |................| [00004.987] 01105.01144> 0x00004f3385879100: 00000000 00000000 25b10000 0000397c |...........%|9..| [00004.987] 01105.01144> 0x00004f3385879110: 325d4090 00000945 00000000 00000000 |.@]2E...........| [00004.987] 01105.01144> 0x00004f3385879120: 00000000 00000000 00000000 00000000 |................| [00004.988] 01105.01144> 0x00004f3385879130: 25b13000 0000397c 25b1306f 0000397c |.0.%|9..o0.%|9..| [00004.988] 01105.01144> 0x00004f3385879140: 25b130bf 0000397c 000000c1 00000000 |.0.%|9..........| [00004.988] 01105.01144> 0x00004f3385879150: 000000bf 00000000 25b13000 0000397c |.........0.%|9..| [00004.988] 01105.01144> 0x00004f3385879160: 25b1306f 0000397c 00000010 00003a3f |o0.%|9......?:..| [00004.988] 01105.01144> 0x00004f3385879170: 325c0ea8 00000945 00001002 00004f33 |..\2E.......3O..| [00004.988] 01105.01144> 0x00004f3385879180: 00000006 00000000 00000000 00000000 |................| [00004.988] 01105.01144> 0x00004f3385879190: 00000000 00000000 85879108 00004f33 |............3O..| [00004.988] 01105.01144> 0x00004f33858791a0: 325d4090 00000945 00000000 00000000 |.@]2E...........| [00004.988] 01105.01144> arch: x86_64 [00004.992] 01105.01144> dso: id=a00d1fa58fa66d498683b4f08ce73933dcdefd63 base=0x6fb3781bb000 name=<vDSO> [00004.992] 01105.01144> dso: id=e5a677de03279e111c67f6055ea442214513b237 base=0x4010c6d63000 name=libc.so [00004.992] 01105.01144> dso: id=788e800c7e74c2a011ad0431d596816740448a13 base=0x3036a22ed000 name=libmxio.so [00004.992] 01105.01144> dso: id=6d8ac831560037a646934de1b2ab97562a5132e2 base=0x2a88da887000 name=liblaunchpad.so [00004.992] 01105.01144> dso: id=fa0ba342ee2b022c base=0x94532071000 name=app:/system/mojo_public_bindings_un [00005.004] 01105.01144> bt#01: pc 0x945321a9811 sp 0x4f33858790b0 (app:/system/mojo_public_bindings_un,0x138811) [00005.011] 01105.01144> bt#02: pc 0x945321a996b sp 0x4f3385879260 (app:/system/mojo_public_bindings_un,0x13896b) [00005.013] 01105.01144> bt#03: pc 0x94532401254 sp 0x4f33858793d0 (app:/system/mojo_public_bindings_un,0x390254) [00005.014] 01105.01144> bt#04: pc 0x945321a85c7 sp 0x4f3385879550 (app:/system/mojo_public_bindings_un,0x1375c7) [00005.016] 01105.01144> bt#05: pc 0x9453248cebb sp 0x4f3385879710 (app:/system/mojo_public_bindings_un,0x41bebb) [00005.017] 01105.01144> bt#06: pc 0x945324b4b9d sp 0x4f3385879800 (app:/system/mojo_public_bindings_un,0x443b9d) [00005.018] 01105.01144> bt#07: pc 0x945324b527d sp 0x4f33858799f0 (app:/system/mojo_public_bindings_un,0x44427d) [00005.019] 01105.01144> bt#08: pc 0x945324e9140 sp 0x4f3385879b50 (app:/system/mojo_public_bindings_un,0x478140) [00005.021] 01105.01144> bt#09: pc 0x945324b43a6 sp 0x4f3385879cd0 (app:/system/mojo_public_bindings_un,0x4433a6) [00005.022] 01105.01144> bt#10: pc 0x945324b19f3 sp 0x4f3385879e40 (app:/system/mojo_public_bindings_un,0x4409f3) [00005.025] 01105.01144> bt#11: pc 0x945324b9ad2 sp 0x4f3385879fc0 (app:/system/mojo_public_bindings_un,0x448ad2) [00005.026] 01105.01144> bt#12: pc 0x4010c6d7ca36 sp 0x4f3385879fe0 (libc.so,0x19a36) [00005.027] 01105.01144> bt#13: pc 0x4010c6df444a sp 0x4f3385879ff0 (libc.so,0x9144a) [00005.030] 01105.01144> bt#14: pc 0 sp 0x4f338587a000 [00005.031] 01105.01144> bt#15: end ----- start symbolized stack #01: operator() at /work/cr/src/out/fuch/../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1081 (inlined by) Invoke<const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, int, int> at /work/cr/src/out/fuch/../../base/bind_internal.h:138 (inlined by) MakeItSo<const (lambda at ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1071:13) &, const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, int, int> at /work/cr/src/out/fuch/../../base/bind_internal.h:265 (inlined by) RunImpl<const (lambda at ../../mojo/public/cpp/bindings/tests/associated_interface_unittest.cc:1071:13) &, const std::__1::tuple<> &> at /work/cr/src/out/fuch/../../base/bind_internal.h:340 (inlined by) Run at /work/cr/src/out/fuch/../../base/bind_internal.h:319 #02: Run at /work/cr/src/out/fuch/../../base/callback.h:80 (inlined by) Invoke<const base::Callback<void (const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, int, int), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, const int &, int> at /work/cr/src/out/fuch/../../base/bind_internal.h:241 (inlined by) MakeItSo<const base::Callback<void (const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, int, int), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, const int &, int> at /work/cr/src/out/fuch/../../base/bind_internal.h:265 (inlined by) RunImpl<const base::Callback<void (const scoped_refptr<base::TaskRunner> &, const base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, int, int), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating> &, const std::__1::tuple<scoped_refptr<base::TaskRunner>, base::Callback<void (), base::internal::CopyMode::Copyable, base::internal::RepeatMode::Repeating>, int> &, 0, 1, 2> at /work/cr/src/out/fuch/../../base/bind_internal.h:340 (inlined by) Run at /work/cr/src/out/fuch/../../base/bind_internal.h:319 #03: Run at /work/cr/src/out/fuch/../../base/callback.h:92 (inlined by) Accept at /work/cr/src/out/fuch/gen/mojo/public/interfaces/bindings/tests/test_associated_interfaces.mojom.cc:1047 #04: Invoke<std::__1::unique_ptr<mojo::MessageReceiver, std::__1::default_delete<mojo::MessageReceiver> >, mojo::Message> at /work/cr/src/out/fuch/../../base/bind_internal.h:151 (inlined by) MakeItSo<void (*const &)(std::__1::unique_ptr<mojo::MessageReceiver, std::__1::default_delete<mojo::MessageReceiver> >, mojo::Message), std::__1::unique_ptr<mojo::MessageReceiver, std::__1::default_delete<mojo::MessageReceiver> >, mojo::Message> at /work/cr/src/out/fuch/../../base/bind_internal.h:265 (inlined by) RunImpl<void (*const &)(std::__1::unique_ptr<mojo::MessageReceiver, std::__1::default_delete<mojo::MessageReceiver> >, mojo::Message), const std::__1::tuple<base::internal::PassedWrapper<std::__1::unique_ptr<mojo::MessageReceiver, std::__1::default_delete<mojo::MessageReceiver> > >, base::internal::PassedWrapper<mojo::Message> > &, 0, 1> at /work/cr/src/out/fuch/../../base/bind_internal.h:340 #05: Run at /work/cr/src/out/fuch/../../base/callback.h:92 (inlined by) RunTask at /work/cr/src/out/fuch/../../base/debug/task_annotator.cc:59 #06: base::internal::TaskTracker::PerformRunTask(std::__1::unique_ptr<base::internal::Task, std::__1::default_delete<base::internal::Task> >, base::internal::Sequence*) at /work/cr/src/out/fuch/../../base/task_scheduler/task_tracker.cc:335 #07: reset at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2582 (inlined by) ~unique_ptr at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2539 (inlined by) PerformRunTask at /work/cr/src/out/fuch/../../base/task_scheduler/task_tracker_posix.cc:22 #08: reset at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2582 (inlined by) ~unique_ptr at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2539 (inlined by) PerformRunTask at /work/cr/src/out/fuch/../../base/test/scoped_task_environment.cc:224 #09: reset at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2582 (inlined by) ~unique_ptr at /work/cr/src/out/fuch/../../buildtools/third_party/libc++/trunk/include/memory:2539 (inlined by) RunNextTask at /work/cr/src/out/fuch/../../base/task_scheduler/task_tracker.cc:251 #10: base::internal::SchedulerWorker::Thread::ThreadMain() at /work/cr/src/out/fuch/../../base/task_scheduler/scheduler_worker.cc:84 #11: base::(anonymous namespace)::ThreadFunc(void*) at /work/cr/src/out/fuch/../../base/threading/platform_thread_posix.cc:73 #12: ?? ??:0 #13: ?? ??:0 ----- end symbolized stack [00005.050] 02541.02676> [21/684] AssociatedInterfaceTest.AssociatedRequestResetWithReason (71 ms) [00005.050] 02541.02676> [22/684] AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr (CRASHED)
,
Aug 3 2017
It's decidedly fishy that we're seeing a thread with a ThreadTaskRunnerHandle set, after posting a task to a freshly-created SequencedTaskRunner - I'd like to understand why that is happening.
,
Aug 4 2017
AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr and InterfacePtrTest.ThreadSafeInterfacePointer currently pass PlatformThread::CurrentId() and compare that to PlatformThread::CurrentId() inside the callback. This is incorrect, and they should be confirming instead that it's on the same sequence. I tried to do this with base::SequencedWorkerPool::GetSequenceTokenForCurrentThread() to get a token outside and inside the callback to confirm they're both happening on the same sequence. That doesn't work however because normally normally the SequencedTaskRunnerHandle::Get() is actually returning ThreadTaskRunnerHandle::Get() which is a SingleThreadTaskRunner (so the token is invalid, and there's no WorkerPool). This seems a bit confused, since it's normally the SingleThreadTaskRunner but rarely is actually the SequencedTaskRunnerHandle I'd expect (?) from TLS. What's the correct way to confirm that the call and execution side are on the same Sequence?
,
Aug 4 2017
base::SequenceChecker or you can keep base::SequencedTaskRunnerHandle::Get() around and DCHECK SequencedTaskRunner::RunsTasksInCurrentSequence(). (definitely don't use base::SequencedWorkerPool::GetSequenceTokenForCurrentThread() -- SequencedWorkerPool is mostly phased out)
,
Aug 4 2017
Why are we sometimes ending up on a thread with a ThreadTaskRunnerHandle, and sometimes on a SequencedTaskRunner thread, though, gab@? That suggests we have some thread in the pool that thinks its a Thread..?
,
Aug 4 2017
Thanks, SequenceChecker makes sense. It didn't seem to make sense to me to use SequencedTaskRunnerHandle::Get()->RunsTasksInCurrentSequence() because the root of the problem seems to be that sometimes a different things are returned by SequencedTaskRunnerHandle::Get().
,
Aug 4 2017
SequencedTaskRunnerHandle::Get() is consistent in a given context. What you might be confusing is that it *also* works in a single-threaded context (will return a SequencedTaskRunner which is in fact a SingleThreadTaskRunner). But it doesn't mix the two, either you're on a sequence in a pool or you're on a thread. SequencedTaskRunnerHandle::Get() just allows to say "I don't care I just want the same "sequence" as my caller" (which, again, can be a thread as threads are sequences).
,
Aug 4 2017
Re #10: I think what gab@ means is that you pass a refptr to the SequencedTaskRunner instead of the platform-thread-id parameter, when Bind()ing the completion callback, and then you just call BelongsToCurrentThread() on that from the completion callback. That should be sufficient to confirm that the completion callback is being invoked on the same sequence as the call was made on, which is what that test cares about.
,
Aug 4 2017
Correct, well except that BelongsToCurrentThread() is a SingleThreadTaskRunner specification for RunsTasksInCurrentSequence() and you'll need to use the latter on a SequencedTaskRunner. Le ven. 4 août 2017 16 h 33, wez via monorail < monorail+v2.1573466780@chromium.org> a écrit :
,
Aug 8 2017
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/45bbf78dcf9448b9358d51bc2cd06fadeeb992d1 commit 45bbf78dcf9448b9358d51bc2cd06fadeeb992d1 Author: Scott Graham <scottmg@chromium.org> Date: Tue Aug 08 15:19:01 2017 Make mojo_public_bindings_unittests confirm correct sequence, not thread Two tests, AssociatedInterfaceTest.ThreadSafeAssociatedInterfacePtr and InterfacePtrTest.ThreadSafeInterfacePointer were checking that their methods were invoked on the same thread. However, the requirement is that they're invoked on the same sequence, so change the test to check for that instead. (This was exposed running on Fuchsia, but applies to all platforms.) Bug: 752167 Change-Id: I2f2e81fb2d41878601ff4ab23cb9c9cb0f2c2a8e Reviewed-on: https://chromium-review.googlesource.com/602484 Reviewed-by: Gabriel Charette <gab@chromium.org> Reviewed-by: Yuzhu Shen <yzshen@chromium.org> Commit-Queue: Scott Graham <scottmg@chromium.org> Cr-Commit-Position: refs/heads/master@{#492628} [modify] https://crrev.com/45bbf78dcf9448b9358d51bc2cd06fadeeb992d1/mojo/public/cpp/bindings/tests/associated_interface_unittest.cc [modify] https://crrev.com/45bbf78dcf9448b9358d51bc2cd06fadeeb992d1/mojo/public/cpp/bindings/tests/interface_ptr_unittest.cc
,
Aug 8 2017
He said hopefully. |
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Comment 1 by scottmg@chromium.org
, Aug 3 2017