19331 2009-03-25 19:00:46 +0300 Похоже сломана работа таймеров с созданием потока в качестве уведомления. 2009-07-10 12:10:10 +0400 1 1 3 Distributions Branch 5.0 glibc unspecified all Linux RESOLVED LATER P4 critical --- 1 rom_as ldv evg qa-5.0 oldest_to_newest 87939 0 rom_as 2009-03-25 19:00:46 +0300 Имеется многопоточная софтина openscada, которая создаёт потоки по таймеру. Таймер создаётся кодом: struct sigevent sigev; memset(&sigev,0,sizeof(sigev)); sigev.sigev_notify = SIGEV_THREAD; sigev.sigev_value.sival_ptr = this; sigev.sigev_notify_function = Task; sigev.sigev_notify_attributes = NULL; int rez = timer_create(CLOCK_REALTIME,&sigev,&tmId); printf("Create timer: '%s' %d(%d)\n",id().c_str(),tmId,rez); Удаляется: int rez = timer_delete(tmId); printf("Delete timer: '%s' %d(%d)\n",id().c_str(),tmId,rez); Падение происходит секунды через 2 после вызова timer_delete: Create timer: '1m' 137099560(0) Create timer: '1s' 134604544(0) Delete timer: '1m' 137099560(0) ./openscada_demo: line 3: 12837 Segmentation fault При этом таймер я даже не запускаю и вызов в функцию Task не приходит, а просто создаю и удаляю таймер. gdb сообщает примерно о таком: (gdb) bt #0 0xb7c774c0 in pthread_cancel () from /lib/librt.so.1 #1 0xb7c85daa in start_thread () from /lib/libpthread.so.0 #2 0xb7d63f4e in clone () from /lib/libc.so.6 Пытался воспроизвести на макете с созданием и удалением таймера из одного потока, но там это не воспроизвелось. Или оказывает влияние на это большое количество потоков исполняемых параллельно, но независимо, или создавать и удалять таймера в разных потоках нельзя, чего в документации я не встречал. P.S. Кроме этого момента таймера работают нормально. А именно запускаются и останавливаются включая и из разных потоков. Процедура по таймеру корректно вызывается. 87942 1 rom_as 2009-03-25 19:39:58 +0300 Похоже в glibc проблемы с разделением доступа к общим данным таймеров и/или потоков. Остановил высоконагруженные потоки с периодичностью 5мс и общей нагрузкой процессора 40%(2ГГц) и таймера нормально поудалялись! Т.е причина не удаление в другом потоке, а проблема совместных ресурсов в GlibC. Кроме того на Branch4.1 x86_64 с kernel-2.6.18ovz у которого нет поддержки времени высокого разрешения и разрешение таймера 4мс, все таймера корректно удалились. 87943 2 rom_as 2009-03-25 20:02:10 +0300 Повышаю приоритет ошибки. 87950 3 rom_as 2009-03-25 22:08:20 +0300 На kernel-2.6.25 и glibc-2.5.1 из Branch 4.0 эта проблема ещё не проявляется. Тестил на ноуте в той-же конфигурации и полной загрузкой CPU тем-же источником. Ядро уже держит высокое разрешение времени. 87970 4 rom_as 2009-03-26 11:25:01 +0300 С компилятором, которым собирается программа, проблема не связана. Собрал gcc-4.3, gcc-4.1 и gcc-3.4, результат идентичен: (gdb) bt #0 0xb7ba64c0 in __gxx_personality_v0 () from /lib/librt.so.1 #1 0xb7bafdaa in start_thread () from /lib/libpthread.so.0 #2 0xb7c92f4e in clone () from /lib/libc.so.6 87976 5 rom_as 2009-03-26 12:15:37 +0300 На SuSE 11.1 с glibc-2.9-2.11.1 - проблема не обнаружена На Mandriva 2009.0 с glibc-2.8-1.20080520.5.2mnb2 - проблема проявляется: (gdb) bt #0 0xb7b249b0 in ?? () from /lib/i686/librt.so.1 #1 0xb7b2723c in ?? () from /lib/i686/librt.so.1 #2 0x086c5178 in ?? () #3 0xb7b24a30 in ?? () from /lib/i686/librt.so.1 #4 0x08a5bf48 in ?? () #5 0x00000000 in ?? () 87996 6 rom_as 2009-03-26 16:02:01 +0300 Пересобрал glibc-2.9-alt4 из Сизифа для Branch 5.0 - проблема не исправилась. 88106 7 rom_as 2009-03-27 13:43:20 +0300 Branch 4.1 glibc-core-2.5.1-alt4 - проблема не проявляется. 88336 8 ldv 2009-03-30 19:33:54 +0400 Роман, спасибо. Можно приложить сюда код, поведение которого изменилось? 88340 9 3419 rom_as 2009-03-30 20:01:27 +0400 Created attachment 3419 Архиватор значений Пожалуйста. Вкладываю файл части исходника проекта OpenSCADA. Только искать там можно долго. Проблемные участки это конструктор и деструктор класса TVArchivator: TVArchivator::TVArchivator( const string &iid, const string &idb, TElem *cf_el ) : run_st(false), prc_st(false), tm_calc(0.0), TConfig(cf_el), m_db(idb), m_id(cfg("ID").getSd()), m_name(cfg("NAME").getSd()), m_dscr(cfg("DESCR").getSd()), m_addr(cfg("ADDR").getSd()), m_start(cfg("START").getBd()), m_v_per(cfg("V_PER").getRd()), m_a_per(cfg("A_PER").getId()) { m_id = iid; //> Create calc timer struct sigevent sigev; memset(&sigev,0,sizeof(sigev)); sigev.sigev_notify = SIGEV_THREAD; sigev.sigev_value.sival_ptr = this; sigev.sigev_notify_function = Task; sigev.sigev_notify_attributes = NULL; timer_create(CLOCK_REALTIME,&sigev,&tmId); } TVArchivator::~TVArchivator() { timer_delete(tmId); } Всё остальное непринципиально, в случае с данной проблемой, поскольку я его наглухо отглушал, а проблема проявлялась. Особенность её ещё в том, что удаление потока в timer_delete происходит не сразу, а отложенно. Поэтому если программу завершать, то проявиться проблема не успевает, да и нагрузка снимается к тому моменту. И если timer_delete(tmId); закомментировать, то проблема не возникает, но естественно текут ресурсы таймера. Вообще была мысль попробовать в макет добавить с десяток потоков с имитацией рабочей нагрузки, что-бы оно проявлялось более отчётливо. 91160 10 rom_as 2009-05-14 13:46:43 +0400 Valgrind по поводу timer_delete() постоянно сообщает такое: ==21938== ==21938== Conditional jump or move depends on uninitialised value(s) ==21938== at 0x4417324: timer_delete (in /lib/librt-2.9.so) ==21938== by 0x405C905: TArchiveS::~TArchiveS() (in /mnt/home/roman/work/OScadaD/lib/liboscada.so.0.0.10) 93226 11 ldv 2009-06-18 01:22:45 +0400 Боюсь что я не готов отлаживать большую и сложную программу из проекта OpenSCADA. К сожалению, апстрим этого тоже не станет делать, для этого нужен test case попроще. 93233 12 rom_as 2009-06-18 10:14:41 +0400 У меня не получилось добиться повторения на тестовом прототипе, даже добавив близкую нагрузку. Похоже сказывается достаточно специфичная нагрузка. Кроме того, в компоненте где ошибка проявлялась я перешёл на независимые потоке, по объективным причинам. Поэтому откладываем на позже, может у кого такое ещё вылезет. 94484 13 rom_as 2009-07-10 12:10:10 +0400 glibc-2.10.1-alt4 Valgrind по прежнему указывает на наличие проблемы в функции timer_delete: ==5608== Thread 1: ==5608== Conditional jump or move depends on uninitialised value(s) ==5608== at 0x442BF72: timer_delete (in /lib/librt-2.10.1.so) ==5608== by 0x6AE9FD7: FSArch::ModArch::~ModArch() (in /mnt/home/roman/work/OScadaD/lib/openscada/arh_FSArch.so) ==5608== by 0x41343FD: TCntrNode::chldDel(char, std::string const&, long, int, bool) (in /mnt/home/roman/work/OScadaD/lib/liboscada.so.0.0.10) ==5608== by 0x40DB504: TSubSYS::modDel(std::string const&) (in /mnt/home/roman/work/OScadaD/lib/liboscada.so.0.0.10) ==5608== by 0x411A4F6: TModSchedul::preDisable(int) (in /mnt/home/roman/work/OScadaD/lib/liboscada.so.0.0.10) ==5608== by 0x41336D6: TCntrNode::nodeDis(long, int) (in /mnt/home/roman/work/OScadaD/lib/liboscada.so.0.0.10) ==5608== by 0x41344BA: TCntrNode::chldDel(char, std::string 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