<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I built the latest version of OpenMP runtime library (<span style="background-color: rgb(255, 255, 255);" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class="">commit 07d9ad356558ea7700cc1794848a7e327f9192ea). I registered the callback function ompt_callback_task_dependences callback for task-dependences event. However, if a program does not contain any tasking construct (only contains a parallel region), the callback is still dispatched. </span></font></span></div><div class=""><span style="background-color: rgb(255, 255, 255);" class=""><font face="Menlo" class=""><span style="font-size: 11px;" class=""><br class=""></span></font></span></div><div class=""><font face="Menlo" class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="font-size: 11px;" class="">The call path is shown below:</span></span></font></div><div class=""><font face="Menlo" class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="font-size: 11px;" class=""><br class=""></span></span></font></div><div class=""><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Starting program: /home/yg31/data-race/pkgs-src/client-dev/more-test/test_sections </span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">[Thread debugging using libthread_db enabled]</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Using host libthread_db library "/lib64/libthread_db.so.1".</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">[0]: ompt initialize: finished</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">[New Thread 0x7fffed4aa780 (LWP 39448)]</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">[New Thread 0x7fffed0a9800 (LWP 39449)]</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">[Switching to Thread 0x7fffed4aa780 (LWP 39448)]</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255); min-height: 13px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Breakpoint 1, TaskDependencesCallback (task_data=0x1, deps=0x1, ndeps=14896224) at /home/yg31/data-race/pkgs-src/ompt-race-dev/src/ompt_race.cpp:734</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">734<span class="Apple-tab-span" style="white-space:pre"> </span> KA_TRACE(0, STDOUT, 0, "TaskDependencesCallback", "called", 0); </span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Missing separate debuginfos, use: debuginfo-install glibc-2.17-157.el7_3.1.x86_64 glibc-2.17-196.el7_4.2.x86_64 libgcc-4.8.5-16.el7_4.1.x86_64 libgcc-4.8.5-16.el7_4.2.x86_64 libstdc++-4.8.5-16.el7_4.1.x86_64 libstdc++-4.8.5-16.el7_4.2.x86_64</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">(gdb) where</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#0 TaskDependencesCallback (task_data=0x1, deps=0x1, ndeps=14896224) at /home/yg31/data-race/pkgs-src/ompt-race-dev/src/ompt_race.cpp:734</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#1 0x00007fffee213c8f in __kmp_join_barrier(int) () from /home/yg31/data-race/pkgs/llvm-openmp-latest-2/lib/libomp.so</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#2 0x00007fffee1ec783 in __kmp_launch_thread () from /home/yg31/data-race/pkgs/llvm-openmp-latest-2/lib/libomp.so</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#3 0x00007fffee240332 in __kmp_launch_worker(void*) () from /home/yg31/data-race/pkgs/llvm-openmp-latest-2/lib/libomp.so</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#4 0x00007fffedf98e25 in start_thread () from /lib64/libpthread.so.0</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">#5 0x00007fffedcc634d in clone () from /lib64/libc.so.6</span></div></div><div class=""><br class=""></div><div class="">I checked the code and it is related with the callback:</div><div class=""><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #cd7923" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>if</span><span style="font-variant-ligatures: no-common-ligatures" class=""> (ompt_enabled.</span><span style="font-variant-ligatures: no-common-ligatures; background-color: #e6e600" class="">ompt_callback</span><span style="font-variant-ligatures: no-common-ligatures" class="">_sync_region) {</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(230, 230, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #cd7923; background-color: #ffffff" class="">1500 </span><span style="font-variant-ligatures: no-common-ligatures; background-color: #ffffff" class=""> </span><span style="font-variant-ligatures: no-common-ligatures" class="">ompt_callback</span><span style="font-variant-ligatures: no-common-ligatures; background-color: #ffffff" class="">s.</span><span style="font-variant-ligatures: no-common-ligatures" class="">ompt_callback</span><span style="font-variant-ligatures: no-common-ligatures; background-color: #ffffff" class="">(</span><span style="font-variant-ligatures: no-common-ligatures" class="">ompt_callback</span><span style="font-variant-ligatures: no-common-ligatures; background-color: #ffffff" class="">_sync_region)(</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #cd7923" class="">1501 </span><span style="font-variant-ligatures: no-common-ligatures" class=""> ompt_sync_region_barrier, ompt_scope_end, my_parallel_data,</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #cd7923" class="">1502 </span><span style="font-variant-ligatures: no-common-ligatures" class=""> my_task_data, return_address);</span></div><div style="margin: 0px; font-stretch: normal; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(255, 255, 255);" class=""><span style="font-variant-ligatures: no-common-ligatures; color: #cd7923" class="">1503 </span><span style="font-variant-ligatures: no-common-ligatures" class=""> }</span></div></div><div class=""><br class=""></div><div class="">In __kmp_join_barrier() of kmp_barrier.cpp. </div><div class=""><br class=""></div><div class="">It could be seen that the parameter task_data = 0x1 and deps = 0x1, which corresponds to to the ompt_sync_region_barrier (equals 1) and ompt_scope_end (equals 1). </div><div class=""><br class=""></div><div class="">May I have some suggestions on this issue? Thanks.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Best regards,</div><div class="">Yizi </div></body></html>