<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Fulfilling event inside task causes deadlock"
href="https://bugs.llvm.org/show_bug.cgi?id=45904">45904</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Fulfilling event inside task causes deadlock
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Runtime Library
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>schuchart@hlrs.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23479" name="attach_23479" title="Minimal example">attachment 23479</a> <a href="attachment.cgi?id=23479&action=edit" title="Minimal example">[details]</a></span>
Minimal example
A task with the detach clause is not completed if the event is fulfilled inside
the task itself before its execution terminates.
Attached is a minimal example (provided by Joachim Protze) to demonstrate this.
The execution deadlocks with the task waiting in the taskwait construct:
#0 0x00007ffff78ccd15 in __kmp_remove_my_task (thread=0x624600, gtid=0,
task_team=0x6278c0, is_constrained=1)
at openmp/runtime/src/kmp_tasking.cpp:2588
#1 0x00007ffff78d3131 in __kmp_execute_tasks_template<kmp_flag_32>
(thread=0x624600, gtid=0, flag=0x7fffffffd260, final_spin=0,
thread_finished=0x7fffffffd28c, itt_sync_obj=0x0,
is_constrained=1) at openmp/runtime/src/kmp_tasking.cpp:2827
#2 0x00007ffff78cd6c3 in __kmp_execute_tasks_32 (thread=0x624600, gtid=0,
flag=0x7fffffffd260, final_spin=0, thread_finished=0x7fffffffd28c,
itt_sync_obj=0x0, is_constrained=1)
at openmp/runtime/src/kmp_tasking.cpp:3002
#3 0x00007ffff78d4772 in kmp_flag_32::execute_tasks (this=0x7fffffffd260,
this_thr=0x624600, gtid=0, final_spin=0, thread_finished=0x7fffffffd28c,
itt_sync_obj=0x0, is_constrained=1)
at openmp/runtime/src/kmp_wait_release.h:753
#4 0x00007ffff78d2ed7 in __kmpc_omp_taskwait_template<false>
(loc_ref=0x7fffffffd328, gtid=0, frame_address=0x0, return_address=0x0)
at openmp/runtime/src/kmp_tasking.cpp:1863
#5 0x00007ffff78cb8e9 in __kmpc_omp_taskwait (loc_ref=0x7fffffffd328, gtid=0)
at openmp/runtime/src/kmp_tasking.cpp:1923
#6 0x00000000004009e9 in .omp_outlined._debug__ (.global_tid.=0x7fffffffd390,
.bound_tid.=0x7fffffffd388) at test_omp_detach_taskwait.c:13
#7 0x0000000000400abd in .omp_outlined..1 (.global_tid.=0x7fffffffd390,
.bound_tid.=0x7fffffffd388) at test_omp_detach_taskwait.c:5
#8 0x00007ffff793c113 in __kmp_invoke_microtask () at
openmp/runtime/src/z_Linux_asm.S:1166
#9 0x00007ffff78a4fb0 in __kmp_fork_call (loc=0x7fffffffd740, gtid=0,
call_context=fork_context_intel, argc=0, microtask=0x400aa0 <.omp_outlined..1>,
invoker=0x7ffff78b13ad <__kmp_invoke_task_func(int)>, ap=0x7fffffffd628) at
openmp/runtime/src/kmp_runtime.cpp:1887
#10 0x00007ffff7892890 in __kmpc_fork_call (loc=0x7fffffffd740, argc=0,
microtask=0x400aa0 <.omp_outlined..1>)
at openmp/runtime/src/kmp_csupport.cpp:308
#11 0x00000000004008cb in main () at test_omp_detach_taskwait.c:5
Clang and libomp were built from git-72edb7986a8059cda12b808aa68828af88a0a1eb</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>