| Issue |
132982
|
| Summary |
[flang][openmp] programs with offloading to amdgpu segfault
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
VeeEM
|
Any program with OpenMP offloading compiled with flang for amdgpu seems to segfault currently. clang works fine, only flang is affected.
A program with just a target region is enough to reproduce:
```
program crash
!$omp target
!$omp end target
end program
```
```
flang -fopenmp --offload-arch=gfx1100 crash.f90
flang-21: warning: OpenMP support in flang is still experimental [-Wexperimental-option]
flang-21: warning: OpenMP support in flang is still experimental [-Wexperimental-option]
flang-21: warning: OpenMP support in flang is still experimental [-Wexperimental-option]
$ ./a.out
Segmentation fault
```
Stacktrace from gdb shows:
```
#0 0x00007ffff3d4fef5 in llvm::omp::target::plugin::AMDGPUKernelTy::launchImpl(llvm::omp::target::plugin::GenericDeviceTy&, unsigned int*, unsigned int*, KernelArgsTy&, KernelLaunchParamsTy, llvm::omp::target::plugin::AsyncInfoWrapperTy&) const
() from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#1 0x00007ffff3d143a5 in llvm::omp::target::plugin::GenericKernelTy::launch(llvm::omp::target::plugin::GenericDeviceTy&, void**, long*, KernelArgsTy&, llvm::omp::target::plugin::AsyncInfoWrapperTy&) const ()
from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#2 0x00007ffff3d1ae04 in llvm::omp::target::plugin::GenericDeviceTy::launchKernel(void*, void**, long*, KernelArgsTy&, __tgt_async_info*) () from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#3 0x00007ffff3d1e092 in llvm::omp::target::plugin::GenericPluginTy::launch_kernel(int, void*, void**, long*, KernelArgsTy*, __tgt_async_info*) () from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#4 0x00007ffff3becd17 in DeviceTy::launchKernel(void*, void**, long*, KernelArgsTy&, AsyncInfoTy&) () from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#5 0x00007ffff3bf847c in target(ident_t*, DeviceTy&, void*, KernelArgsTy&, AsyncInfoTy&) () from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#6 0x00007ffff3beff59 in __tgt_target_kernel () from /home/acc/install_llvm2/lib/x86_64-unknown-linux-gnu/libomptarget.so.21.0git
#7 0x000055555555675c in _QQmain ()
#8 0x0000555555556782 in main ()
```
Tested at f7f5aa217a81f2ec036fee765124bd2057531d86.
Machine specs: Ubuntu 24.04.1, rocm 6.3.0, Ryzen 9 9900X, RX 7900 GRE.
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