On Tue, Feb 22, 2022 at 7:17 AM Jakob Gruber <jgru...@chromium.org> wrote:
> Looks to me like a deadlock between
>
> if (blocking_behavior == BlockingBehavior::kBlock) {
> base::MutexGuard lock_guard(&ref_count_mutex_);
> while (ref_count_ > 0) ref_count_zero_.Wait(&ref_count_mutex_);
>
>
> https://source.chromium.org/chromium/chromium/src/+/main:v8/src/compiler-dispatcher/optimizing-compile-dispatcher.cc;l=172;drc=a2d4701bea545269ad3f5fe6e111adb65c46b8da
>
> and
>
> base::MutexGuard lock_guard(&dispatcher_->ref_count_mutex_);
> if (--dispatcher_->ref_count_ == 0) {
>
>
> https://source.chromium.org/chromium/chromium/src/+/main:v8/src/compiler-dispatcher/optimizing-compile-dispatcher.cc;l=82;drc=a2d4701bea545269ad3f5fe6e111adb65c46b8da
>
> I'm puzzled how this should work, maybe I'm missing something. The
> ref_count_mutex_ is locked on both sides, so if we enter the while-loop
> waiting for it to hit zero, we can't actually decrement the ref count.
>
Indeed I missed the (obvious in hindsight)
`ref_count_zero_.Wait(&ref_count_mutex_);` call, thanks tebbi@ for pointing
that out.
>
> On Tue, Feb 22, 2022 at 2:16 AM Igor Randjelovic <rigor...@gmail.com>
> wrote:
>
>> Hello, I'm also from the NativeScript team...
>>
>> Another case that we found to hang the same way is whenever we handle the
>> `*Debugger.setBreakpointByUrl*` protocol message, in which case we see
>> the following stack:
>>
>> v8_inspector::(anonymous
>> namespace)::ActualScript::setBreakpoint(v8_inspector::String16 const&,
>> v8::debug::Location*, int*) const v8-debugger-script.cc:255
>> v8_inspector::V8DebuggerAgentImpl::setBreakpointImpl(v8_inspector::String16
>> const&, v8_inspector::String16 const&, v8_inspector::String16 const&, int,
>> int) v8-debugger-agent-impl.cc:953
>> v8_inspector::V8DebuggerAgentImpl::setBreakpointByUrl(int,
>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>> v8_crdtp::detail::ValueMaybe<int>,
>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>> v8_inspector::String16*,
>> std::__Cr::unique_ptr<std::__Cr::vector<std::__Cr::unique_ptr<v8_inspector::protocol::Debugger::Location,
>> std::__Cr::default_delete<v8_inspector::protocol::Debugger::Location> >,
>> std::__Cr::allocator<std::__Cr::unique_ptr<v8_inspector::protocol::Debugger::Location,
>> std::__Cr::default_delete<v8_inspector::protocol::Debugger::Location> > >
>> >,
>> std::__Cr::default_delete<std::__Cr::vector<std::__Cr::unique_ptr<v8_inspector::protocol::Debugger::Location,
>> std::__Cr::default_delete<v8_inspector::protocol::Debugger::Location> >,
>> std::__Cr::allocator<std::__Cr::unique_ptr<v8_inspector::protocol::Debugger::Location,
>> std::__Cr::default_delete<v8_inspector::protocol::Debugger::Location> > > >
>> > >*) v8-debugger-agent-impl.cc:582
>> v8_inspector::protocol::Debugger::DomainDispatcherImpl::setBreakpointByUrl(v8_crdtp::Dispatchable
>> const&) Debugger.cpp:1333
>> v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29::operator()(v8_crdtp::Dispatchable const&) const
>> Debugger.cpp:519
>> decltype(std::__Cr::forward<v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29&>(fp)(std::__Cr::forward<v8_crdtp::Dispatchable const&>(fp0)))
>> std::__Cr::__invoke<v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29&, v8_crdtp::Dispatchable
>> const&>(v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29&, v8_crdtp::Dispatchable const&) type_traits:3694 void
>> std::__Cr::__invoke_void_return_wrapper<void,
>> true>::__call<v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29&, v8_crdtp::Dispatchable
>> const&>(v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29&, v8_crdtp::Dispatchable const&) __functional_base:348
>> std::__Cr::__function::__default_alloc_func<v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29, void (v8_crdtp::Dispatchable
>> const&)>::operator()(v8_crdtp::Dispatchable const&) functional:1611 void
>> std::__Cr::__function::__policy_invoker<void (v8_crdtp::Dispatchable
>> const&)>::__call_impl<std::__Cr::__function::__default_alloc_func<v8_inspector::protocol::Debugger::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>> char>)::$_29, void (v8_crdtp::Dispatchable const&)>
>> >(std::__Cr::__function::__policy_storage const*, v8_crdtp::Dispatchable
>> const&) functional:2092 void std::__Cr::__function::__policy_invoker<void
>> ()>::__call_impl<std::__Cr::__function::__default_alloc_func<v8_crdtp::UberDispatcher::Dispatch(v8_crdtp::Dispatchable
>> const&) const::$_0, void ()> >(std::__Cr::__function::__policy_storage
>> const*) 0x00000000b91e6ee1 v8_crdtp::UberDispatcher::DispatchResult::Run()
>> 0x00000000b91e516a
>> v8_inspector::V8InspectorSessionImpl::dispatchProtocolMessage(v8_inspector::StringView)
>> v8-inspector-session-impl.cc:451
>> tns::JsV8InspectorClient::doDispatchMessage(v8::Isolate*,
>> std::__Cr::basic_string<char, std::__Cr::char_traits<char>,
>> std::__Cr::allocator<char> > const&) JsV8InspectorClient.cpp:131
>> tns::JsV8InspectorClient::dispatchMessage(std::__Cr::basic_string<char,
>> std::__Cr::char_traits<char>, std::__Cr::allocator<char> > const&)
>> JsV8InspectorClient.cpp:89
>> ::Java_com_tns_AndroidJsV8Inspector_dispatchMessage(JNIEnv *, jobject,
>> jstring) com_tns_AndroidJsV8Inspector.cpp:29
>> art_quick_generic_jni_trampoline 0x00000000e400b2b3 art_quick_invoke_stub
>> 0x00000000e4004aa3 art::ArtMethod::Invoke(art::Thread*, unsigned int*,
>> unsigned int, art::JValue*, char const*) 0x00000000e4099502
>> art::interpreter::ArtInterpreterToCompiledCodeBridge(art::Thread*,
>> art::ArtMethod*, art::ShadowFrame*, unsigned short, art::JValue*)
>> 0x00000000e424f882 bool art::interpreter::DoCall<false,
>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>> const*, unsigned short, art::JValue*) 0x00000000e4243bbf void
>> art::interpreter::ExecuteSwitchImplCpp<false,
>> false>(art::interpreter::SwitchImplContext*) 0x00000000e4017fcf
>> ExecuteSwitchImplAsm 0x00000000e400bf63
>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.10914192770458939989)
>> 0x00000000e4238e02
>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>> 0x00000000e4242da0 bool art::interpreter::DoCall<false,
>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>> const*, unsigned short, art::JValue*) 0x00000000e4243ba1 void
>> art::interpreter::ExecuteSwitchImplCpp<false,
>> false>(art::interpreter::SwitchImplContext*) 0x00000000e4017d01
>> ExecuteSwitchImplAsm 0x00000000e400bf63
>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.10914192770458939989)
>> 0x00000000e4238e02
>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>> 0x00000000e4242da0 bool art::interpreter::DoCall<false,
>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>> const*, unsigned short, art::JValue*) 0x00000000e4243ba1 void
>> art::interpreter::ExecuteSwitchImplCpp<false,
>> false>(art::interpreter::SwitchImplContext*) 0x00000000e4016381
>> ExecuteSwitchImplAsm 0x00000000e400bf63
>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.10914192770458939989)
>> 0x00000000e4238e02
>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>> 0x00000000e4242da0 bool art::interpreter::DoCall<false,
>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>> const*, unsigned short, art::JValue*) 0x00000000e4243ba1 void
>> art::interpreter::ExecuteSwitchImplCpp<false,
>> false>(art::interpreter::SwitchImplContext*) 0x00000000e4017fcf
>> ExecuteSwitchImplAsm 0x00000000e400bf63
>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.10914192770458939989)
>> 0x00000000e4238e02
>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>> 0x00000000e4242da0 bool art::interpreter::DoCall<false,
>> true>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>> const*, unsigned short, art::JValue*) 0x00000000e4244636 void
>> art::interpreter::ExecuteSwitchImplCpp<true,
>> false>(art::interpreter::SwitchImplContext*) 0x00000000e4057794
>> ExecuteSwitchImplAsm 0x00000000e400bf63
>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.10914192770458939989)
>> 0x00000000e4238c0f
>> art::interpreter::EnterInterpreterFromEntryPoint(art::Thread*,
>> art::CodeItemDataAccessor const&, art::ShadowFrame*) 0x00000000e4242c81
>> artQuickToInterpreterBridge 0x00000000e4656186
>> art_quick_to_interpreter_bridge 0x00000000e400b38e <unknown>
>> 0x00000000e400b530
>>
>> As Eduardo mentioned, any hints or insights would be very appreciated!
>>
>> Thanks,
>> Igor
>>
>> On Monday, 21 February 2022 at 22:33:22 UTC+1 Eduardo Speroni wrote:
>>
>>> Hello!
>>>
>>> We're trying to upgrade the v8 runtime to 9.7 in NativeScript but ran
>>> into this issue when implementing the code for enabling the inspector
>>> console.
>>>
>>> We receive the message and call v8::debug::EvaluateGlobal with
>>> kDisableBreaksAndThrowOnSideEffect:
>>>
>>>
>>> https://github.com/NativeScript/android-runtime/blob/3a8316d47f965730ca9edeec8bed733a2636c6d9/test-app/runtime/src/main/cpp/v8_inspector/src/inspector/v8-runtime-agent-impl.cc#L279-L289
>>>
>>> After that the thread hangs. Pausing the app shows the following stack
>>> trace:
>>>
>>> syscall 0x00000073f171d35c __futex_wait_ex(void volatile*, bool, int,
>>> bool, timespec const*) 0x00000073f1721984 pthread_cond_wait
>>> 0x00000073f1781b90
>>> v8::internal::OptimizingCompileDispatcher::FlushQueues(v8::internal::BlockingBehavior,
>>> bool) 0x00000070cd85c348
>>> v8::internal::OptimizingCompileDispatcher::Flush(v8::internal::BlockingBehavior)
>>> 0x00000070cd85c3b4
>>> v8::internal::Debug::DeoptimizeFunction(v8::internal::Handle<v8::internal::SharedFunctionInfo>)
>>> 0x00000070cd576324 v8::internal::Runtime_DebugOnFunctionCall(int, unsigned
>>> long*, v8::internal::Isolate*) 0x00000070cd8f8b98
>>> Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_NoBuiltinExit
>>> 0x00000070cdb6856c Builtins_CallFunction_ReceiverIsAny 0x00000070cdae25ec
>>> Builtins_JSEntryTrampoline 0x00000070cdaebacc Builtins_JSEntry
>>> 0x00000070cdaeb768 v8::internal::(anonymous
>>> namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous
>>> namespace)::InvokeParams const&) 0x00000070cd60b6d4
>>> v8::internal::Execution::CallScript(v8::internal::Isolate*,
>>> v8::internal::Handle<v8::internal::JSFunction>,
>>> v8::internal::Handle<v8::internal::Object>,
>>> v8::internal::Handle<v8::internal::FixedArray>) 0x00000070cd60b9d4
>>> v8::internal::DebugEvaluate::Global(v8::internal::Isolate*,
>>> v8::internal::Handle<v8::internal::JSFunction>,
>>> v8::debug::EvaluateGlobalMode, v8::internal::REPLMode) 0x00000070cd56926c
>>> v8::internal::DebugEvaluate::Global(v8::internal::Isolate*,
>>> v8::internal::Handle<v8::internal::String>, v8::debug::EvaluateGlobalMode,
>>> v8::internal::REPLMode) 0x00000070cd569080
>>> v8::debug::EvaluateGlobal(v8::Isolate*, v8::Local<v8::String>,
>>> v8::debug::EvaluateGlobalMode, bool) 0x00000070cd566580
>>> v8_inspector::V8RuntimeAgentImpl::evaluate(v8_inspector::String16 const&,
>>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>>> v8_crdtp::detail::ValueMaybe<bool>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<int>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<bool>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<bool>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<double>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<bool>, v8_crdtp::detail::ValueMaybe<bool>,
>>> v8_crdtp::detail::ValueMaybe<v8_inspector::String16>,
>>> std::__Cr::unique_ptr<v8_inspector::protocol::Runtime::Backend::EvaluateCallback,
>>> std::__Cr::default_delete<v8_inspector::protocol::Runtime::Backend::EvaluateCallback>
>>> >) v8-runtime-agent-impl.cc:309
>>> v8_inspector::protocol::Runtime::DomainDispatcherImpl::evaluate(v8_crdtp::Dispatchable
>>> const&) Runtime.cpp:961
>>> v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69::operator()(v8_crdtp::Dispatchable const&) const
>>> Runtime.cpp:635
>>> decltype(std::__Cr::forward<v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69&>(fp)(std::__Cr::forward<v8_crdtp::Dispatchable const&>(fp0)))
>>> std::__Cr::__invoke<v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69&, v8_crdtp::Dispatchable
>>> const&>(v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69&, v8_crdtp::Dispatchable const&) type_traits:3694 void
>>> std::__Cr::__invoke_void_return_wrapper<void,
>>> true>::__call<v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69&, v8_crdtp::Dispatchable
>>> const&>(v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69&, v8_crdtp::Dispatchable const&) __functional_base:348
>>> std::__Cr::__function::__default_alloc_func<v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69, void (v8_crdtp::Dispatchable
>>> const&)>::operator()(v8_crdtp::Dispatchable const&) functional:1611 void
>>> std::__Cr::__function::__policy_invoker<void (v8_crdtp::Dispatchable
>>> const&)>::__call_impl<std::__Cr::__function::__default_alloc_func<v8_inspector::protocol::Runtime::DomainDispatcherImpl::Dispatch(v8_crdtp::span<unsigned
>>> char>)::$_69, void (v8_crdtp::Dispatchable const&)>
>>> >(std::__Cr::__function::__policy_storage const*, v8_crdtp::Dispatchable
>>> const&) functional:2092 v8_crdtp::UberDispatcher::DispatchResult::Run()
>>> 0x00000070cd1e2954
>>> v8_inspector::V8InspectorSessionImpl::dispatchProtocolMessage(v8_inspector::StringView)
>>> v8-inspector-session-impl.cc:454
>>> tns::JsV8InspectorClient::doDispatchMessage(v8::Isolate*,
>>> std::__Cr::basic_string<char, std::__Cr::char_traits<char>,
>>> std::__Cr::allocator<char> > const&) JsV8InspectorClient.cpp:131
>>> tns::JsV8InspectorClient::dispatchMessage(std::__Cr::basic_string<char,
>>> std::__Cr::char_traits<char>, std::__Cr::allocator<char> > const&)
>>> JsV8InspectorClient.cpp:89
>>> ::Java_com_tns_AndroidJsV8Inspector_dispatchMessage(JNIEnv *, jobject,
>>> jstring) com_tns_AndroidJsV8Inspector.cpp:29
>>> art_quick_generic_jni_trampoline 0x00000071422d9a48 art_quick_invoke_stub
>>> 0x00000071422d0168
>>> art::interpreter::ArtInterpreterToCompiledCodeBridge(art::Thread*,
>>> art::ArtMethod*, art::ShadowFrame*, unsigned short, art::JValue*)
>>> 0x00000071422f47c8 bool art::interpreter::DoCall<false,
>>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>>> const*, unsigned short, art::JValue*) 0x0000007142417a20 void
>>> art::interpreter::ExecuteSwitchImplCpp<false,
>>> false>(art::interpreter::SwitchImplContext*) 0x000000714221660c
>>> ExecuteSwitchImplAsm 0x00000071422dc3dc
>>> art::interpreter::ExecuteSwitch(art::Thread*, art::CodeItemDataAccessor
>>> const&, art::ShadowFrame&, art::JValue, bool) (.llvm.6649268296134209133)
>>> 0x0000007142545d58 art::interpreter::Execute(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame&, art::JValue, bool,
>>> bool) (.llvm.6649268296134209133) 0x000000714227e2f0
>>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>>> 0x00000071423851d4 bool art::interpreter::DoCall<false,
>>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>>> const*, unsigned short, art::JValue*) 0x0000007142417c98 void
>>> art::interpreter::ExecuteSwitchImplCpp<false,
>>> false>(art::interpreter::SwitchImplContext*) 0x00000071422166a0
>>> ExecuteSwitchImplAsm 0x00000071422dc3dc
>>> art::interpreter::ExecuteSwitch(art::Thread*, art::CodeItemDataAccessor
>>> const&, art::ShadowFrame&, art::JValue, bool) (.llvm.6649268296134209133)
>>> 0x0000007142545d58 art::interpreter::Execute(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame&, art::JValue, bool,
>>> bool) (.llvm.6649268296134209133) 0x000000714227e2f0
>>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>>> 0x00000071423851d4 bool art::interpreter::DoCall<false,
>>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>>> const*, unsigned short, art::JValue*) 0x0000007142417c98 void
>>> art::interpreter::ExecuteSwitchImplCpp<false,
>>> false>(art::interpreter::SwitchImplContext*) 0x0000007142210704
>>> ExecuteSwitchImplAsm 0x00000071422dc3dc
>>> art::interpreter::ExecuteSwitch(art::Thread*, art::CodeItemDataAccessor
>>> const&, art::ShadowFrame&, art::JValue, bool) (.llvm.6649268296134209133)
>>> 0x0000007142545d58 art::interpreter::Execute(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame&, art::JValue, bool,
>>> bool) (.llvm.6649268296134209133) 0x000000714227e2f0
>>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>>> 0x00000071423851d4 bool art::interpreter::DoCall<false,
>>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>>> const*, unsigned short, art::JValue*) 0x0000007142417c98 void
>>> art::interpreter::ExecuteSwitchImplCpp<false,
>>> false>(art::interpreter::SwitchImplContext*) 0x000000714221660c
>>> ExecuteSwitchImplAsm 0x00000071422dc3dc
>>> art::interpreter::ExecuteSwitch(art::Thread*, art::CodeItemDataAccessor
>>> const&, art::ShadowFrame&, art::JValue, bool) (.llvm.6649268296134209133)
>>> 0x0000007142545d58 art::interpreter::Execute(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame&, art::JValue, bool,
>>> bool) (.llvm.6649268296134209133) 0x000000714227e2f0
>>> art::interpreter::ArtInterpreterToInterpreterBridge(art::Thread*,
>>> art::CodeItemDataAccessor const&, art::ShadowFrame*, art::JValue*)
>>> 0x00000071423851d4 bool art::interpreter::DoCall<false,
>>> false>(art::ArtMethod*, art::Thread*, art::ShadowFrame&, art::Instruction
>>> const*, unsigned short, art::JValue*) 0x0000007142417c98 void
>>> art::interpreter::ExecuteSwitchImplCpp<false,
>>> false>(art::interpreter::SwitchImplContext*) 0x0000007142210704
>>> ExecuteSwitchImplAsm 0x00000071422dc3dc MterpInvokeStatic
>>> 0x0000007142775dc0 mterp_op_invoke_static 0x00000071422caa18
>>> art::interpreter::Execute(art::Thread*, art::CodeItemDataAccessor const&,
>>> art::ShadowFrame&, art::JValue, bool, bool) (.llvm.6649268296134209133)
>>> 0x000000714227dd78 artQuickToInterpreterBridge 0x000000714227cf20
>>> art_quick_to_interpreter_bridge 0x00000071422d9b7c <unknown>
>>> 0x00000071422d9d90
>>>
>>>
>>>
>>> I believe the code is hanging on this line exactly:
>>>
>>>
>>> https://github.com/v8/v8/blob/2257f6b14584c191e601cd10ccf3925540f2e492/src/compiler-dispatcher/optimizing-compile-dispatcher.cc#L179
>>>
>>> but I can't find out why. Checking the other threads it doesn't seem
>>> there are any v8 calls hanging. If we switch to kDisableBreaks or
>>> kDefault then the app doesn't hang anymore, but the behavior still isn't
>>> correct.
>>>
>>> Any insight would be greatly appreciated! Thanks
>>>
>> --
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>
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