llvmbot
commented
2 days ago @llvm/issue-subscribers-backend-x86
Author: Sebastian Hubold (Hubold17)
Every time I run `clang -o 6.exe 6.c 6.ll -Wno-override-module`, where '6' is the file name, I get this error:
```
clang -o 6.exe 6.c 6.ll -Wno-override-module
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /usr/local/bin/clang-20 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir 6.exe- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name 6.ll -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/sebas/compiler-design/llvmexercises -fcoverage-compilation-dir=/home/sebas/compiler-design/llvmexercises -resource-dir /usr/local/lib/clang/20 -Wno-override-module -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/6-c0a290.o -x ir 6.ll
1. Code generation
2. Running pass 'Function Pass Manager' on module '6.ll'.
3. Running pass 'X86 DAG->DAG Instruction Selection' on function '@sum_arr_llvm'
#0 0x00005638e5e81550 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/local/bin/clang-20+0x3b29550)
#1 0x00005638e5e7ed8e SignalHandler(int) Signals.cpp:0:0
#2 0x00007f275f82e520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x00005638e6fa8226 llvm::FastISel::handlePHINodesInSuccessorBlocks(llvm::BasicBlock const*) (/usr/local/bin/clang-20+0x4c50226)
#4 0x00005638e6fad6d4 llvm::FastISel::selectInstruction(llvm::Instruction const*) (/usr/local/bin/clang-20+0x4c556d4)
#5 0x00005638e70cc41b llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/usr/local/bin/clang-20+0x4d7441b)
#6 0x00005638e70cddf9 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/usr/local/bin/clang-20+0x4d75df9)
#7 0x00005638e70bd1fd llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/usr/local/bin/clang-20+0x4d651fd)
#8 0x00005638e528bdbf llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#9 0x00005638e57f2641 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/local/bin/clang-20+0x349a641)
#10 0x00005638e57f2804 llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/local/bin/clang-20+0x349a804)
#11 0x00005638e57f327b llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/local/bin/clang-20+0x349b27b)
#12 0x00005638e611028d clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/usr/local/bin/clang-20+0x3db828d)
#13 0x00005638e67951e1 clang::CodeGenAction::ExecuteAction() (/usr/local/bin/clang-20+0x443d1e1)
#14 0x00005638e6a79cc1 clang::FrontendAction::Execute() (/usr/local/bin/clang-20+0x4721cc1)
#15 0x00005638e69ecb1b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/local/bin/clang-20+0x4694b1b)
#16 0x00005638e6b483d3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/bin/clang-20+0x47f03d3)
#17 0x00005638e32b721c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/local/bin/clang-20+0xf5f21c)
#18 0x00005638e32aeee2 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#19 0x00005638e32b2780 clang_main(int, char**, llvm::ToolContext const&) (/usr/local/bin/clang-20+0xf5a780)
#20 0x00005638e318ed0b main (/usr/local/bin/clang-20+0xe36d0b)
#21 0x00007f275f815d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#22 0x00007f275f815e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#23 0x00005638e32ae945 _start (/usr/local/bin/clang-20+0xf56945)
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 20.0.0git (https://github.com/llvm/llvm-project.git e1f8f84acec05997893c305c78fbf7feecf44dd7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/6-8bd0d3.c
clang: note: diagnostic msg: /tmp/6-8bd0d3.sh
clang: note: diagnostic msg:
********************
make: *** [Makefile:2: 6.exe] Error 1
```
The source code `6.ll` I try to compile (probably wrong, ik):
```llvm
define i64 @sum_arr_llvm(i64* %arr, i64 %n) {
entry:
br label %loop_header
loop_header:
%i = phi i64 [0, %entry], [%i_inc, %loop_header]
%sum = phi i64 [0, %entry], [%sum_upd, %loop_header]
%1 = icmp slt i64 %i, %n
br i1 %1, label %loop_body, label %exit
loop_body:
%e_ptr = getelementptr i64, i64* %arr, i64 %i
%e = load i64, i64* %e_ptr
%sum_upd = add i64 %sum, %e
%i_inc = add i64 %i, 1
br label %loop_header
exit:
ret i64 %sum
}
```
The mentioned files `/tmp/6-8bd0d3.c`:
```c
# 1 "<built-in>"
# 1 "6.c"
long sum_arr_llvm(long *arr, long n);
long sum_arr(long *arr, long n) {
long sum = 0;
for (long i = 0; i < n; i++) {
sum += arr[i];
}
return sum;
}
int main() {
long arr[] = { 1, 2, 3, 4, 5 };
__builtin_printf("array: {%ld, %ld, %ld, %ld, %ld}\n",
arr[0], arr[1], arr[2], arr[3], arr[4]);
__builtin_printf("sum_arr(arr, 5) = %ld\n", sum_arr(arr, 5));
__builtin_printf("sum_arr_llvm(arr, 5) = %ld\n", sum_arr_llvm(arr, 5));
}
```
and `/tmp/6-8bd0d3.sh`:
```sh
# Crash reproducer for clang version 20.0.0git (https://github.com/llvm/llvm-project.git e1f8f84acec05997893c305c78fbf7feecf44dd7)
# Driver args: "-o" "6.exe" "6.c" "6.ll" "-Wno-override-module"
# Original command: "/usr/local/bin/clang-20" "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-dumpdir" "6.exe-" "-disable-free" "-clear-ast-before-backend" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "6.ll" "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie" "-mframe-pointer=all" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" "-funwind-tables=2" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fdebug-compilation-dir=/home/sebas/compiler-design/llvmexercises" "-fcoverage-compilation-dir=/home/sebas/compiler-design/llvmexercises" "-resource-dir" "/usr/local/lib/clang/20" "-Wno-override-module" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fskip-odr-check-in-gmf" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-o" "/tmp/6-c0a290.o" "-x" "ir" "6.ll"
"/usr/local/bin/clang-20" "-cc1" "-triple" "x86_64-unknown-linux-gnu" "-emit-obj" "-dumpdir" "6.exe-" "-disable-free" "-clear-ast-before-backend" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "6.ll" "-mrelocation-model" "pic" "-pic-level" "2" "-pic-is-pie" "-mframe-pointer=all" "-fmath-errno" "-ffp-contract=on" "-fno-rounding-math" "-mconstructor-aliases" "-funwind-tables=2" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fdebug-compilation-dir=/home/sebas/compiler-design/llvmexercises" "-fcoverage-compilation-dir=/home/sebas/compiler-design/llvmexercises" "-Wno-override-module" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fskip-odr-check-in-gmf" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-x" "ir" "6-8bd0d3.c"
```
Every time I run
clang -o 6.exe 6.c 6.ll -Wno-override-module, where '6' is the file name, I get this error:The source code
6.llI try to compile (probably wrong, ik):The mentioned files
/tmp/6-8bd0d3.c:and
/tmp/6-8bd0d3.sh: