Hi. Running Helgrind (Valgrind 3.17.0) on arm32 (Linux 4.14.139), glibc 2.31, and an application using Poco 1.10.1, I see the following:
==17922== Possible data race during read of size 1 at 0x64BD4C4 by thread #97 ==17922== Locks held: 1, at address 0x1C134CC ==17922== at 0x48536D8: my_memcmp (hg_intercepts.c:220) ==17922== by 0x4853BBF: mutex_destroy_WRK (hg_intercepts.c:859) ==17922== by 0x48572F7: pthread_mutex_destroy (hg_intercepts.c:882) ==17922== by 0x5705F23: Poco::EventImpl::~EventImpl() (Event_POSIX.cpp:96) ==17922== by 0x5706393: Poco::Event::~Event() (Event.cpp:40) ==17922== by 0x578099B: Poco::Timer::~Timer() (Timer.cpp:34) ==17922== by 0x5470827: Poco::Data::SessionPool::~SessionPool() (SessionPool.cpp:40) ==17922== by 0x54708A7: Poco::Data::SessionPool::~SessionPool() (SessionPool.cpp:50) ==.....== [ ... ] ==17922== ==17922== This conflicts with a previous write of size 4 by thread #7 ==17922== Locks held: none ==17922== at 0x57F8998: __pthread_mutex_unlock_usercnt (pthread_mutex_unlock.c:52) ==17922== by 0x4854273: mutex_unlock_WRK (hg_intercepts.c:1106) ==17922== by 0x4857337: pthread_mutex_unlock (hg_intercepts.c:1124) ==17922== by 0x5781153: setImpl (Event_POSIX.h:61) ==17922== by 0x5781153: set (Event.h:101) ==17922== by 0x5781153: Poco::Timer::run() (Timer.cpp:216) ==17922== by 0x577ACAF: Poco::PooledThread::run() (ThreadPool.cpp:199) ==17922== by 0x57765B3: Poco::ThreadImpl::runnableEntry(void*) (Thread_POSIX.cpp:345) ==17922== by 0x48562FF: mythread_wrapper (hg_intercepts.c:398) ==17922== by 0x57F4143: start_thread (pthread_create.c:477) To me it seems that Helgrind itself is causing the warning when calculating mutex_is_init (hg_intercepts.c:859). The conflicting access is a write to the field __data.__owner of the mutex (https://elixir.bootlin.com/glibc/glibc-2.31/source/nptl/pthread_mutex_unlock.c#L52). Any ideas what could be going on here? Thanks, Adriaan _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
