Fix flaky CarbonRouterClient.basicUsageSameThreadClient test #458
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CarbonRouterClient.basicUsageSameThreadClient currently does not wait
for code running on the proxy EVB to complete, which causes flakiness
and errors like the following:
```
*** Aborted at 1734013374 (Unix time, try 'date -d @1734013374') ***
*** Signal 11 (SIGSEGV) (0x0) received by PID 72130 (pthread TID 0x7f4b45a096c0) (linux TID 72132) (code: 128), stack trace: ***
@ 00000000007f0586 folly::symbolizer::(anonymous namespace)::signalHandler(int, siginfo_t*, void*)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/debugging/symbolizer/SignalHandler.cpp:453
@ 0000000000019dcf (unknown)
@ 000000000078cdb9 folly::TimeoutManager::clearCobTimeouts()
/usr/include/boost/intrusive/detail/list_node.hpp:60
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/TimeoutManager.cpp
@ 000000000078df70 folly::VirtualEventBase::destroyImpl()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/VirtualEventBase.cpp:38
@ 00000000007739e6 bool folly::AtomicNotificationQueue<folly::Function<void ()> >::drive<folly::EventBase::FuncRunner&>(folly::EventBase::FuncRunner&)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/Function.h:370
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 0000000000775183 folly::EventBaseAtomicNotificationQueue<folly::Function<void ()>, folly::EventBase::FuncRunner>::execute()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBaseAtomicNotificationQueue-inl.h:270
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 000000000077521c non-virtual thunk to folly::EventBaseAtomicNotificationQueue<folly::Function<void ()>, folly::EventBase::FuncRunner>::handlerReady(unsigned short)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBaseAtomicNotificationQueue-inl.h:279
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 000000000077a783 folly::EventHandler::libeventCallback(int, short, void*)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventHandler.cpp:159
@ 00000000000247f9 (unknown)
@ 000000000002642e event_base_loop
@ 000000000076e331 folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:99
@ 000000000076e74d folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:516
@ 000000000076e7e7 folly::EventBase::loop()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:477
@ 0000000000771336 folly::EventBase::loopForever()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:784
@ 00000000007221eb folly::IOThreadPoolExecutor::threadRun(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/executors/IOThreadPoolExecutor.cpp:241
@ 000000000072c557 void folly::detail::function::call_<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)>, true, false, void>(, folly::detail::function::Data&)
/usr/include/c++/14/bits/invoke.h:74
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/executors/ThreadPoolExecutor.cpp
@ 000000000004b523 (unknown)
@ 0000000000070cd6 start_thread
@ 00000000000f4c8b __clone3
```
As a fix, add explicit synchronization to ensure the code scheduled on
the EVB completes first before attempting to terminate the EVB.
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Dec 20, 2024
Summary:
CarbonRouterClient.basicUsageSameThreadClient currently does not wait for code running on the proxy EVB to complete, which causes flakiness and errors like the following:
```
*** Aborted at 1734013374 (Unix time, try 'date -d 1734013374') ***
*** Signal 11 (SIGSEGV) (0x0) received by PID 72130 (pthread TID 0x7f4b45a096c0) (linux TID 72132) (code: 128), stack trace: ***
@ 00000000007f0586 folly::symbolizer::(anonymous namespace)::signalHandler(int, siginfo_t*, void*)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/debugging/symbolizer/SignalHandler.cpp:453
@ 0000000000019dcf (unknown)
@ 000000000078cdb9 folly::TimeoutManager::clearCobTimeouts()
/usr/include/boost/intrusive/detail/list_node.hpp:60
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/TimeoutManager.cpp
@ 000000000078df70 folly::VirtualEventBase::destroyImpl()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/VirtualEventBase.cpp:38
@ 00000000007739e6 bool folly::AtomicNotificationQueue<folly::Function<void ()> >::drive<folly::EventBase::FuncRunner&>(folly::EventBase::FuncRunner&)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/Function.h:370
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 0000000000775183 folly::EventBaseAtomicNotificationQueue<folly::Function<void ()>, folly::EventBase::FuncRunner>::execute()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBaseAtomicNotificationQueue-inl.h:270
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 000000000077521c non-virtual thunk to folly::EventBaseAtomicNotificationQueue<folly::Function<void ()>, folly::EventBase::FuncRunner>::handlerReady(unsigned short)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBaseAtomicNotificationQueue-inl.h:279
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp
@ 000000000077a783 folly::EventHandler::libeventCallback(int, short, void*)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventHandler.cpp:159
@ 00000000000247f9 (unknown)
@ 000000000002642e event_base_loop
@ 000000000076e331 folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:99
@ 000000000076e74d folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:516
@ 000000000076e7e7 folly::EventBase::loop()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:477
@ 0000000000771336 folly::EventBase::loopForever()
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/io/async/EventBase.cpp:784
@ 00000000007221eb folly::IOThreadPoolExecutor::threadRun(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)
/home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/executors/IOThreadPoolExecutor.cpp:241
@ 000000000072c557 void folly::detail::function::call_<std::_Bind<void (folly::ThreadPoolExecutor::*(folly::ThreadPoolExecutor*, std::shared_ptr<folly::ThreadPoolExecutor::Thread>))(std::shared_ptr<folly::ThreadPoolExecutor::Thread>)>, true, false, void>(, folly::detail::function::Data&)
/usr/include/c++/14/bits/invoke.h:74
-> /home/mszabo/Documents/fbcode-scratch/repos/git.luolix.top-facebook-folly.git/folly/executors/ThreadPoolExecutor.cpp
@ 000000000004b523 (unknown)
@ 0000000000070cd6 start_thread
@ 00000000000f4c8b __clone3
```
As a fix, add explicit synchronization to ensure the code scheduled on the EVB completes first before attempting to terminate the EVB.
X-link: facebook/mcrouter#458
Reviewed By: disylh
Differential Revision: D67521838
Pulled By: stuclar
fbshipit-source-id: 6f90bacea961a04054f31a9926a4fb2f9958a439
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CarbonRouterClient.basicUsageSameThreadClient currently does not wait for code running on the proxy EVB to complete, which causes flakiness and errors like the following:
As a fix, add explicit synchronization to ensure the code scheduled on the EVB completes first before attempting to terminate the EVB.