<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 - Crash in passing firstprivate args to tasks on Apple M1"
href="https://bugs.llvm.org/show_bug.cgi?id=48885">48885</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Crash in passing firstprivate args to tasks on Apple M1
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>jcownie@gmail.com
</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=24420" name="attach_24420" title="Simple test code.">attachment 24420</a> <a href="attachment.cgi?id=24420&action=edit" title="Simple test code.">[details]</a></span>
Simple test code.
Passing threadprivate arguments into a task crashes on the Apple M1 aarch64)
machine.
The attached code demonstrates the problem when compiled with -fopenmp (and no
optimisation; with optimisation it appears to pass, but I think that is because
then the compiler recognises that the firstprivate values are constant and
therefore doesn't bother to pass them!)
$ clang --version
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
975b64b29375cdfb3672fedee4216c6512672fbf)
Target: aarch64-apple-darwin20.2.0
Thread model: posix
InstalledDir: /Users/jcownie/software/clang-12.0.0/arm64/bin
$ clang -fopenmp -g test_taskargs.c
$ lldb ./a.out
(lldb) target create "./a.out"
Current executable set to '/Users/jcownie/PPS_rtl/tests/a.out' (arm64).
(lldb) run
run
Process 72954 launched: '/Users/jcownie/PPS_rtl/tests/a.out' (arm64)
Process 72954 stopped
* thread #5, stop reason = EXC_BAD_ACCESS (code=1, address=0x61502000000)
frame #0: 0x0000000100003d6c a.out`.omp_task_entry. [inlined]
.omp_outlined.(.global_tid.=4, .part_id.=0x0000000108107ed0,
.privates.=0x0000000108107ee8, .copy_fn.=(a.out`.omp_task_privates_map. at
test_taskargs.c:22), .task_t.=0x0000000108107ec0, __context=0x0000000108107ef0)
at test_taskargs.c:25:24
22 #pragma omp task firstprivate(tpvar, tpvar2)
23 {
24 fprintf (stderr, "In task in thread %d tpvar = %d (should be
42), tpvar2 = %d (should be 84)\n", omp_get_thread_num(),
-> 25 tpvar, tpvar2);
^
26 failed = (tpvar != 42) || (tpvar2 != 84);
27 }
28 }
Target 0: (a.out) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
* frame #0: 0x0000000100003d64 a.out`.omp_task_entry. [inlined]
.omp_outlined.(.global_tid.=0, .part_id.=0x0000000108107ed0,
.privates.=0x0000000108107ee8, .copy_fn.=(a.out`.omp_task_privates_map. at
test_taskargs.c:22), .task_t.=0x0000000108107ec0, __context=0x0000000108107ef0)
at test_taskargs.c:25:17
frame #1: 0x0000000100003d08 a.out`.omp_task_entry.((null)=0,
(null)=0x0000000108107ec0) at test_taskargs.c:22
frame #2: 0x0000000100141878 libomp.dylib`__kmp_invoke_task(int, kmp_task*,
kmp_taskdata*) + 308
frame #3: 0x0000000100144c38 libomp.dylib`int __kmp_execute_tasks_64<false,
true>(kmp_info*, int, kmp_flag_64<false, true>*, int, int*, void*, int) + 744
frame #4: 0x000000010014e308 libomp.dylib`kmp_flag_64<false,
true>::wait(kmp_info*, int, void*) + 596
frame #5: 0x000000010014c6b8
libomp.dylib`__kmp_hyper_barrier_gather(barrier_type, kmp_info*, int, int, void
(*)(void*, void*), void*) + 800
frame #6: 0x000000010014c090 libomp.dylib`__kmp_join_barrier(int) + 592
frame #7: 0x000000010012efd0 libomp.dylib`__kmp_internal_join + 92
frame #8: 0x000000010012e848 libomp.dylib`__kmp_join_call + 264
frame #9: 0x0000000100121ff8 libomp.dylib`__kmpc_fork_call + 220
frame #10: 0x0000000100003b8c a.out`main(argc=1, argv=0x000000016fdff6e0)
at test_taskargs.c:15:1
frame #11: 0x000000018e1f4f34 libdyld.dylib`start + 4
Note that this may be some issue related to a difference in the way varags
functions are handled by the Apple Aarch64 calling convention from the way
that they're handled on Linux Aarch64.
This code compiles and executes correctly on Linux/Aarch64, and on other
architectures (X86_64, ...)</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>