Open
Description
I have a recent flang built from sources:
flang version 21.0.0git (https://github.com/llvm/llvm-project.git b68e8f1de71a65b21910aff4aea75fc1ca6bf6e0)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/llvm/llvm-project/install/bin
The following simple function trigger a core dump when targeting Nvidia GPUs:
MODULE trigtest_m
IMPLICIT NONE
CONTAINS
PURE REAL FUNCTION test(inp)
!$omp declare target
REAL, INTENT(IN) :: inp
test = cos(inp)
END FUNCTION test
END MODULE trigtest_m
When compiling this (flang -fopenmp -fopenmp-targets=nvptx64 -c trigtest.F90) a core dump is trigegred:
$ flang -fopenmp -fopenmp-targets=nvptx64 -c trigtest.F90
LLVM ERROR: Cannot select: 0x584ecf0e8b20: f32 = fcos contract 0x584ecf0e8ab0
0x584ecf0e8ab0: f32,ch = load<(load (s32) from %ir.0)> 0x584ecf17cba0, 0x584ecf0e8960, undef:i64
0x584ecf0e8960: i64,ch = load<(dereferenceable invariant load (s64), addrspace 101)> 0x584ecf17cba0, ExternalSymbol:i64'_QMtrigtest_mPtest_param_0', undef:i64
In function: _QMtrigtest_mPtest
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: /opt/llvm/llvm-project/install/bin/flang -fc1 -triple nvptx64-nvidia-cuda -S -fcolor-diagnostics -mrelocation-model pic -pic-level 2 -target-cpu sm_89 -fopenmp -resource-dir /opt/llvm/llvm-project/install/lib/clang/21 -fopenmp-host-ir-file-path /tmp/trigtest-e73a63.bc -fopenmp-is-target-device -mframe-pointer=all -o /tmp/trigtest-sm_89-c45a71.s -x f95 trigtest.F90
1. Running pass 'Function Pass Manager' on module 'FIRModule'.
2. Running pass 'NVPTX DAG->DAG Pattern Instruction Selection' on function '@_QMtrigtest_mPtest'
#0 0x0000584ea4b2d6b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/llvm/llvm-project/install/bin/flang+0x16586b8)
#1 0x0000584ea4b2b385 llvm::sys::RunSignalHandlers() (/opt/llvm/llvm-project/install/bin/flang+0x1656385)
#2 0x0000584ea4b2ddb1 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007cf0dc645330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007cf0dc69eb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#5 0x00007cf0dc69eb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#6 0x00007cf0dc69eb2c pthread_kill ./nptl/pthread_kill.c:89:10
#7 0x00007cf0dc64527e raise ./signal/../sysdeps/posix/raise.c:27:6
#8 0x00007cf0dc6288ff abort ./stdlib/abort.c:81:7
#9 0x0000584ea4acdbb4 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/llvm/llvm-project/install/bin/flang+0x15f8bb4)
#10 0x0000584ea707b685 (/opt/llvm/llvm-project/install/bin/flang+0x3ba6685)
#11 0x0000584ea707ac65 (/opt/llvm/llvm-project/install/bin/flang+0x3ba5c65)
#12 0x0000584ea707175c llvm::SelectionDAGISel::DoInstructionSelection() (/opt/llvm/llvm-project/install/bin/flang+0x3b9c75c)
#13 0x0000584ea7070ef8 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/llvm/llvm-project/install/bin/flang+0x3b9bef8)
#14 0x0000584ea70706f5 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/llvm/llvm-project/install/bin/flang+0x3b9b6f5)
#15 0x0000584ea706e5db llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/llvm/llvm-project/install/bin/flang+0x3b995db)
#16 0x0000584ea49c8db5 llvm::NVPTXDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/llvm/llvm-project/install/bin/flang+0x14f3db5)
#17 0x0000584ea706cb11 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/llvm/llvm-project/install/bin/flang+0x3b97b11)
#18 0x0000584ea7333f08 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/llvm/llvm-project/install/bin/flang+0x3e5ef08)
#19 0x0000584ea9611e2a llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/llvm/llvm-project/install/bin/flang+0x613ce2a)
#20 0x0000584ea9618c63 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/llvm/llvm-project/install/bin/flang+0x6143c63)
#21 0x0000584ea9612a46 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/llvm/llvm-project/install/bin/flang+0x613da46)
#22 0x0000584ea4d6fca6 generateMachineCodeOrAssemblyImpl(clang::DiagnosticsEngine&, llvm::TargetMachine&, Fortran::frontend::BackendActionTy, llvm::Module&, Fortran::frontend::CodeGenOptions const&, llvm::raw_pwrite_stream&) FrontendActions.cpp:0:0
#23 0x0000584ea4d6f955 Fortran::frontend::CodeGenAction::executeAction() (/opt/llvm/llvm-project/install/bin/flang+0x189a955)
#24 0x0000584ea4b5c8ec Fortran::frontend::FrontendAction::execute() (/opt/llvm/llvm-project/install/bin/flang+0x16878ec)
#25 0x0000584ea4b480f2 Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/opt/llvm/llvm-project/install/bin/flang+0x16730f2)
#26 0x0000584ea4b60b75 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/opt/llvm/llvm-project/install/bin/flang+0x168bb75)
#27 0x0000584ea4643881 fc1_main(llvm::ArrayRef<char const*>, char const*) (/opt/llvm/llvm-project/install/bin/flang+0x116e881)
#28 0x0000584ea4642ab7 main (/opt/llvm/llvm-project/install/bin/flang+0x116dab7)
#29 0x00007cf0dc62a1ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#30 0x00007cf0dc62a28b call_init ./csu/../csu/libc-start.c:128:20
#31 0x00007cf0dc62a28b __libc_start_main ./csu/../csu/libc-start.c:347:5
#32 0x0000584ea4641c05 _start (/opt/llvm/llvm-project/install/bin/flang+0x116cc05)
flang-21: error: unable to execute command: Aborted (core dumped)
flang-21: error: flang frontend command failed due to signal (use -v to see invocation)
flang version 21.0.0git (https://github.com/llvm/llvm-project.git b68e8f1de71a65b21910aff4aea75fc1ca6bf6e0)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/llvm/llvm-project/install/bin
flang-21: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
flang-21: note: diagnostic msg: /tmp/trigtest-sm_89-7716ac
flang-21: note: diagnostic msg: /tmp/trigtest-cb82a3
flang-21: note: diagnostic msg: /tmp/trigtest-sm_89-7716ac.sh
flang-21: note: diagnostic msg:
********************
The core dump happens both when using cos or sin, but not with tan, acos, asin or atan, those "only" trigger a failure in Ptx assembly similar to the one reported in issue #147023. I do not know the internals of flang well enough to say if this is the same issue as #147023 or not, please forgive me for opening two issues if these are related.
Thanks for your effort.