| Issue |
139729
|
| Summary |
Non deterministic crash (segfault) on x86_64-linux-gnu
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
KavyaChopra04
|
```
kchopra@ast-epyc5:~$ clang -v
clang version 21.0.0git (https://github.com/llvm/llvm-project.git da17ced11b1cf44b433cb2b850978df4b6bff279)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/home/kchopra/compilers/bin
Build config: +assertions
Found candidate GCC installation: /local/home/kchopra/compilers/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.1
Found candidate GCC installation: /local/home/kchopra/compilers/bin/../lib/gcc/x86_64-pc-linux-gnu/16.0.0
Selected GCC installation: /local/home/kchopra/compilers/bin/../lib/gcc/x86_64-pc-linux-gnu/16.0.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
kchopra@ast-epyc5:~$ for i in $(seq 1 10); do echo "run $i"; clang -O3 -w clang_segfault.c; done
run 1
run 2
run 3
run 4
run 5
run 6
run 7
run 8
run 9
run 10
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: /local/home/kchopra/compilers/bin/clang-21 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -main-file-name clang_segfault.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -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/kchopra -fcoverage-compilation-dir=/home/kchopra -resource-dir /local/home/kchopra/compilers/lib/clang/21 -internal-isystem /local/home/kchopra/compilers/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /local/home/kchopra/compilers/bin/../lib/gcc/x86_64-pc-linux-gnu/16.0.0/../../../../x86_64-pc-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -w -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/clang_segfault-74d042.o -x c clang_segfault.c
1. <eof> parser at end of file
2. Optimizer
3. Running pass "function<eager-inv>(float2int,lower-constant-intrinsics,chr,loop(loop-rotate<header-duplication;no-prepare-for-lto>,loop-deletion),loop-distribute,inject-tli-mappings,loop-vectorize<no-interleave-forced-only;no-vectorize-forced-only;>,infer-alignment,loop-load-elim,instcombine<max-iterations=1;no-verify-fixpoint>,simplifycfg<bonus-inst-threshold=1;forward-switch-cond;switch-range-to-icmp;switch-to-lookup;no-keep-loops;hoist-common-insts;no-hoist-loads-stores-with-cond-faulting;sink-common-insts;speculate-blocks;simplify-cond-branch;no-speculate-unpredictables>,slp-vectorizer,vector-combine,instcombine<max-iterations=1;no-verify-fixpoint>,loop-unroll<O3>,transform-warning,sroa<preserve-cfg>,infer-alignment,instcombine<max-iterations=1;no-verify-fixpoint>,loop-mssa(licm<allowspeculation>),alignment-from-assumptions,loop-sink,instsimplify,div-rem-pairs,tailcallelim,simplifycfg<bonus-inst-threshold=1;no-forward-switch-cond;switch-range-to-icmp;no-switch-to-lookup;keep-loops;no-hoist-common-insts;hoist-loads-stores-with-cond-faulting;no-sink-common-insts;speculate-blocks;simplify-cond-branch;speculate-unpredictables>)" on module "clang_segfault.c"
4. Running pass "slp-vectorizer" on function "main"
#0 0x000055a66c494040 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/local/home/kchopra/compilers/bin/clang-21+0x45a6040)
#1 0x000055a66c49144f llvm::sys::RunSignalHandlers() (/local/home/kchopra/compilers/bin/clang-21+0x45a344f)
#2 0x000055a66c49159a SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007fb19e29b520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000055a66bd6c66a llvm::Instruction::comesBefore(llvm::Instruction const*) const (/local/home/kchopra/compilers/bin/clang-21+0x3e7e66a)
#5 0x000055a66df5e462 llvm::slpvectorizer::BoUpSLP::getLastInstructionInBundle(llvm::slpvectorizer::BoUpSLP::TreeEntry const*) (/local/home/kchopra/compilers/bin/clang-21+0x6070462)
#6 0x000055a66df7701e llvm::slpvectorizer::BoUpSLP::isGatherShuffledSingleRegisterEntry(llvm::slpvectorizer::BoUpSLP::TreeEntry const*, llvm::ArrayRef<llvm::Value*>, llvm::MutableArrayRef<int>, llvm::SmallVectorImpl<llvm::slpvectorizer::BoUpSLP::TreeEntry const*>&, unsigned int, bool) (/local/home/kchopra/compilers/bin/clang-21+0x608901e)
#7 0x000055a66df78944 llvm::slpvectorizer::BoUpSLP::isGatherShuffledEntry(llvm::slpvectorizer::BoUpSLP::TreeEntry const*, llvm::ArrayRef<llvm::Value*>, llvm::SmallVectorImpl<int>&, llvm::SmallVectorImpl<llvm::SmallVector<llvm::slpvectorizer::BoUpSLP::TreeEntry const*, 6u>>&, unsigned int, bool) (/local/home/kchopra/compilers/bin/clang-21+0x608a944)
#8 0x000055a66dfc5703 llvm::InstructionCost llvm::slpvectorizer::BoUpSLP::processBuildVector<llvm::slpvectorizer::BoUpSLP::ShuffleCostEstimator, llvm::InstructionCost, llvm::TargetTransformInfo, llvm::ArrayRef<llvm::Value*>, llvm::slpvectorizer::BoUpSLP, llvm::SmallPtrSetImpl<llvm::Value*>>(llvm::slpvectorizer::BoUpSLP::TreeEntry const*, llvm::Type*, llvm::TargetTransformInfo&, llvm::ArrayRef<llvm::Value*>&, llvm::slpvectorizer::BoUpSLP&, llvm::SmallPtrSetImpl<llvm::Value*>&) (/local/home/kchopra/compilers/bin/clang-21+0x60d7703)
#9 0x000055a66dfc8c8d llvm::slpvectorizer::BoUpSLP::getEntryCost(llvm::slpvectorizer::BoUpSLP::TreeEntry const*, llvm::ArrayRef<llvm::Value*>, llvm::SmallPtrSetImpl<llvm::Value*>&) (/local/home/kchopra/compilers/bin/clang-21+0x60dac8d)
#10 0x000055a66dfe10a0 llvm::slpvectorizer::BoUpSLP::getTreeCost(llvm::ArrayRef<llvm::Value*>, llvm::InstructionCost) (/local/home/kchopra/compilers/bin/clang-21+0x60f30a0)
#11 0x000055a66dfeaee0 llvm::SLPVectorizerPass::tryToVectorizeList(llvm::ArrayRef<llvm::Value*>, llvm::slpvectorizer::BoUpSLP&, bool) (/local/home/kchopra/compilers/bin/clang-21+0x60fcee0)
#12 0x000055a66dfeff92 bool tryToVectorizeSequence<llvm::Value>(llvm::SmallVectorImpl<llvm::Value*>&, llvm::function_ref<bool (llvm::Value*, llvm::Value*)>, llvm::function_ref<bool (llvm::Value*, llvm::Value*)>, llvm::function_ref<bool (llvm::ArrayRef<llvm::Value*>, bool)>, bool, llvm::slpvectorizer::BoUpSLP&) (.constprop.0) SLPVectorizer.cpp:0:0
#13 0x000055a66dff1934 llvm::SLPVectorizerPass::vectorizeChainsInBlock(llvm::BasicBlock*, llvm::slpvectorizer::BoUpSLP&) (/local/home/kchopra/compilers/bin/clang-21+0x6103934)
#14 0x000055a66dff98f6 llvm::SLPVectorizerPass::runImpl(llvm::Function&, llvm::ScalarEvolution*, llvm::TargetTransformInfo*, llvm::TargetLibraryInfo*, llvm::AAResults*, llvm::LoopInfo*, llvm::DominatorTree*, llvm::AssumptionCache*, llvm::DemandedBits*, llvm::OptimizationRemarkEmitter*) (.part.0) SLPVectorizer.cpp:0:0
#15 0x000055a66dffa531 llvm::SLPVectorizerPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/home/kchopra/compilers/bin/clang-21+0x610c531)
#16 0x000055a66da47bf6 llvm::detail::PassModel<llvm::Function, llvm::SLPVectorizerPass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/home/kchopra/compilers/bin/clang-21+0x5b59bf6)
#17 0x000055a66be1020f llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/home/kchopra/compilers/bin/clang-21+0x3f2220f)
#18 0x000055a669646ca6 llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/home/kchopra/compilers/bin/clang-21+0x1758ca6)
#19 0x000055a66be0e583 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/home/kchopra/compilers/bin/clang-21+0x3f20583)
#20 0x000055a6696444d6 llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/home/kchopra/compilers/bin/clang-21+0x17564d6)
#21 0x000055a66be0f16d llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/home/kchopra/compilers/bin/clang-21+0x3f2116d)
#22 0x000055a66c73d331 (anonymous namespace)::EmitAssemblyHelper::RunOptimizationPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&, clang::BackendConsumer*) BackendUtil.cpp:0:0
#23 0x000055a66c7417db clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, 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*) (/local/home/kchopra/compilers/bin/clang-21+0x48537db)
#24 0x000055a66ce18b34 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/local/home/kchopra/compilers/bin/clang-21+0x4f2ab34)
#25 0x000055a66e800c6c clang::ParseAST(clang::Sema&, bool, bool) (/local/home/kchopra/compilers/bin/clang-21+0x6912c6c)
#26 0x000055a66d131eb9 clang::FrontendAction::Execute() (/local/home/kchopra/compilers/bin/clang-21+0x5243eb9)
#27 0x000055a66d0adbb5 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/local/home/kchopra/compilers/bin/clang-21+0x51bfbb5)
#28 0x000055a66d2195c8 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/local/home/kchopra/compilers/bin/clang-21+0x532b5c8)
#29 0x000055a6691dc107 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/local/home/kchopra/compilers/bin/clang-21+0x12ee107)
#30 0x000055a6691d241a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x000055a6691d6ae0 clang_main(int, char**, llvm::ToolContext const&) (/local/home/kchopra/compilers/bin/clang-21+0x12e8ae0)
#32 0x000055a66907368b main (/local/home/kchopra/compilers/bin/clang-21+0x118568b)
#33 0x00007fb19e282d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#34 0x00007fb19e282e40 call_init ./csu/../csu/libc-start.c:128:20
#35 0x00007fb19e282e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#36 0x000055a6691d1b45 _start (/local/home/kchopra/compilers/bin/clang-21+0x12e3b45)
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 21.0.0git (https://github.com/llvm/llvm-project.git da17ced11b1cf44b433cb2b850978df4b6bff279)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/home/kchopra/compilers/bin
Build config: +assertions
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/clang_segfault-e21d9d.c
clang: note: diagnostic msg: /tmp/clang_segfault-e21d9d.sh
clang: note: diagnostic msg:
********************
kchopra@ast-epyc5:~$ cat clang_segfault.c
int var_1;
int var_2;
int var_3;
int var_4;
int var_6;
int var_9;
int var_10;
int var_11;
int var_13;
int var_14;
int var_15 ;
int main() {
goto BB4;
BB1:
goto BB29;
BB4:
var_3 = 1;
BB5:
goto BB14;
BB6:
if (2025100610 * var_9 * 323887919)
goto BB14;
var_14 = 1741868570;
if (var_10)
goto BB27;
BB8:
if (var_15 + var_14)
goto BB6;
BB14:
var_3 = 1485542403;
if (var_10)
goto BB30;
goto BB5;
BB17:
goto BB1;
BB18:
var_15 = 1274432114;
if (var_4)
goto BB23;
goto BB24;
BB19:
var_1 = 1489610677 * var_13 + 1794346479 * var_1 + 1260019376;
var_14 = 306148117 * var_3 + 1849779946 * var_15 + 1404056795;
if (var_2)
goto BB24;
BB21:
if (var_14 >= 0)
goto BB19;
var_9 = var_10 = 1928472226 * var_1;
if (var_14 + 864073056)
goto BB18;
BB23:
var_13 = 611231288;
if (var_3)
goto BB25;
goto BB8;
BB24:
if (var_11)
goto BB30;
BB25:
var_3 = var_10 - 1874305104;
if (var_9)
goto BB28;
BB27:
var_6 = var_6 - 1724215819;
if (-var_3 >= 0)
goto BB4;
goto BB21;
BB28:
BB29:
if (var_2 * var_3)
goto BB21;
goto BB17;
BB30:
goto BB8;
}
```
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