<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/65237>65237</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [OpenMP] crashing in libomptarget
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ye-luo
      </td>
    </tr>
</table>

<pre>
    My llvm recipe
```
cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ \
 -DCMAKE_BUILD_TYPE=Release \
 -DCMAKE_INSTALL_PREFIX=/soft/llvm/main-patched \
 -DLLVM_ENABLE_BACKTRACES=ON \
    -DLLVM_ENABLE_WERROR=OFF \
 -DBUILD_SHARED_LIBS=OFF \
    -DLLVM_ENABLE_RTTI=ON \
 -DLLVM_TARGETS_TO_BUILD="X86;AMDGPU;NVPTX" \
 -DLLVM_ENABLE_ASSERTIONS=ON \
 -DLLVM_ENABLE_PROJECTS="clang;compiler-rt;lld" \
 -DLIBOMPTARGET_ENABLE_DEBUG=ON \
    ../llvm-project/llvm
```
then build openmp using gcc (tested gcc9-12). The issue is not reproducible if openmp is built with clang.
```
cmake -DCMAKE_C_COMPILER=/soft/llvm/main-patched/bin/clang \
 -DCMAKE_CXX_COMPILER=/soft/llvm/main-patched/bin/clang++ \
 -DLLVM_ROOT=/soft/llvm/main-patched -DLIBOMPTARGET_ENABLE_DEBUG=ON \
 -DCMAKE_INSTALL_PREFIX=/soft/llvm/main-patched ../llvm-project/openmp
```

Using this repdrodcer https://github.com/ye-luo/openmp-target/blob/master/tests/target_task/target_update_nowait_taskwait.cpp
```
clang++ -fopenmp -fopenmp-targets=x86_64-pc-linux-gnu -O3 target_nowait_taskwait.cpp && ./a.out
clang++ -fopenmp --offload-arch=gfx906 -O3 target_nowait_taskwait.cpp && ./a.out
clang++ -fopenmp --offload-arch=sm_86 -O3 target_nowait_taskwait.cpp && ./a.out
```
I got `Segmentation fault` or `illegal instruction` depending on the OS. It fails on SLES SP4 and Ubuntu 20.04 and 22.04.

Even if I built openmp with debugging flags. I still got `??` in the backtrace.
```
#1 0x00007ffff7b39ed8 in ?? () from /soft/llvm/main-patched/lib/libomptarget.so.18git
#2  0x00007ffff7b3c4a0 in ?? () from /soft/llvm/main-patched/lib/libomptarget.so.18git
#3 0x0000000000000000 in ?? ()
```
I also noticed changing `-O3` to `-O0` makes the test run.
So I'm wondering if there is some potential bug in the tasking runtime as the segfault happens when running the `update from nowait` target task.

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy0Vl1zmzgU_TXyyx0YkGxsP_jBjnGXrR08hnSzTx4BArQVEoNEk_77HYGT5sNtp51pxkMQupxzde_REVRrXknGVmi2QbPthPamVt3qK3NEryaZKr6uDl9BiC8NdCznLUPeFnlrFHiX3zDMG_qZgbO9Oaw_hueb8018OEb78ITItsrzbxP396-mEN4gvAE0uxlhngM3d9F-e07_PYaIbE9MMKrZlbDoNknX-_35eAp30T0iW4R3WpUG4Z3NGOFdQ7l0WmrymhWvAPb7T4dzeLve7MPzZn3zMT2tb8IEkW18-yIO4E3oP-HpFNvc493uFd6YcfLX-hRuz_tok7yLeYd1StPoLeElIl2fPoRpck7jsRTD0vD9IkBksz5sPxzvENncfjqm9wjj765rnSThKY3i23freh13PMV_hzdpMrLkgsoKkU2umpYL1jmdQWQjRPGOKtrEh-OY6hPUNtzcfbhSRde99MRpO_Ufy59bdE1NpmYSsp6LAlTLZNNCr7mswEoJ4YVh2rDCjpaOjxFeupDWDLjWvb2CVAY61naq6HOeCQa8fMLhesA18MBNDcNK3V8V9A81hvAu4xLh3YB9RbJvtsAvgF3ZLEMTT3Gc_lT6v9Ct39xc1zo8Vv1qgcfr3dBXU3NtO1Z0qshZB7UxrUZkjfAO4V3FTd1nbq4s5ehLz9COoV3FLFUmVDakpA3rEN5ZkWj7fwg4G6o_fxv1bUENO0v1QPk4Z2_cvL2e68vyO-VFSk83lxQ0ItvHRXAOpk6bO4LL_tGpZA9OTODCeoUOEA4QDsDWjrqqNz8idFRZCkULh3Z5be2zfFx6wZ9k0M158ZsEb0oYQaUMoMBLWNUwaajhSkJJe2FQ4IHq7BwXglVUAJfadH1uQ-xkwVomCysUJcHUDOLEhchASbnQ9lmyDxNIjlOgsoC7rJemB-y53vgAY9ebui9VF35h0ppCdDGDy_IHTyhY1leVJSsFrbQLEWjDhXjKH5Gd_QUe8DGZjOafTUdzdt1IECY-eI-e53nzsizLeUaWrFjYt0co62gIL6HsVAM_swPBs_GqmnZsiauV6y8qbp7pMLzhy6fU-4N85EL38u8d3XdEQYVW1q95zgrIayqHyqPAc2Jia2zUOLDvgLVkPdTcbm7oenkpeaIgQnjewIOSBessBC9tYDecB1o1DFplmDScCsj66ql3Vsc2uuul4Q0DOsJrVg3KhJq2LZMaHuyB1PVSjm7FbFKjh4xlHLfFkPBQpAH4ktykWJFiSZZ0wlZ-sCTzBZ4Tf1KvSM4WMz_wsZct_SLI82mwoAvqF2S29IvpbMJX2MPEW3oEEx_7vou9bMqWwWwelP48m_lo6rGGcuHa5rmqqybDGbgKZpjMJ4JmTOjhuw5jyR7GAxJhbD_zutVg1VlfaTT1BNdGf0Mx3IjhgzBumTwc0WwLeUd1PRRWwks5TPpOrH7g1xdZvTkXhkysOw-Z_h8AAP__hw0qdg">