| Issue |
125417
|
| Summary |
clang crashes on valid code at -O{s,2,3} on x86_64-linux-gnu: Assertion `!Order.empty() && "expected non-empty order"' failed
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
zhendongsu
|
It appears to be a recent regression as it doesn't reproduce with 19.1.0 and earlier.
Compiler Explorer: https://godbolt.org/z/b8G3v5j7o
```
[527] % clangtk -v
clang version 21.0.0git (https://github.com/llvm/llvm-project.git 642e84f0012b6e3a0e4f187bad5ee1775c3d623a)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/software/local/clang-trunk/bin
Build config: +assertions
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Candidate multilib: .;@m64
Selected multilib: .;@m64
[528] %
[528] % clangtk -O3 small.c
clang-21: /local/suz-local/software/clangbuild/llvm-project/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:1546: static bool llvm::slpvectorizer::BoUpSLP::isIdentityOrder(llvm::ArrayRef<unsigned int>): Assertion `!Order.empty() && "expected non-empty order"' failed.
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/suz-local/software/local/clang-trunk/bin/clang-21 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -main-file-name small.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=/local/suz-local/software/emitesting/bugs/20250202-clangtk-m64-O3-build-144035/delta -fcoverage-compilation-dir=/local/suz-local/software/emitesting/bugs/20250202-clangtk-m64-O3-build-144035/delta -resource-dir /local/suz-local/software/local/clang-trunk/lib/clang/21 -I /usr/local/include -I /local/suz-local/software/local/include -internal-isystem /local/suz-local/software/local/clang-trunk/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -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/small-d22fb8.o -x c small.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 "small.c"
4. Running pass "slp-vectorizer" on function "main"
#0 0x0000557965ea9cdf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x479fcdf)
#1 0x0000557965ea74b4 SignalHandler(int) Signals.cpp:0:0
#2 0x00007f8766745420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x00007f876617c00b raise /build/glibc-LcI20x/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#4 0x00007f876615b859 abort /build/glibc-LcI20x/glibc-2.31/stdlib/abort.c:81:7
#5 0x00007f876615b729 get_sysdep_segment_value /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:509:8
#6 0x00007f876615b729 _nl_load_domain /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:970:34
#7 0x00007f876616cfd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
#8 0x000055796796cb06 llvm::slpvectorizer::BoUpSLP::TreeEntry::reorderSplitNode(unsigned int, llvm::ArrayRef<int>, llvm::ArrayRef<int>) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x6262b06)
#9 0x0000557967a23953 llvm::slpvectorizer::BoUpSLP::reorderTopToBottom() (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x6319953)
#10 0x0000557967a31798 llvm::SLPVectorizerPass::tryToVectorizeList(llvm::ArrayRef<llvm::Value*>, llvm::slpvectorizer::BoUpSLP&, bool) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x6327798)
#11 0x0000557967a36bbd 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
#12 0x0000557967a385b1 llvm::SLPVectorizerPass::vectorizeChainsInBlock(llvm::BasicBlock*, llvm::slpvectorizer::BoUpSLP&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x632e5b1)
#13 0x0000557967a40656 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
#14 0x0000557967a411b3 llvm::SLPVectorizerPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x63371b3)
#15 0x000055796745e086 llvm::detail::PassModel<llvm::Function, llvm::SLPVectorizerPass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x5d54086)
#16 0x0000557965820139 llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x4116139)
#17 0x000055796311a376 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/suz-local/software/local/clang-trunk/bin/clang-21+0x1a10376)
#18 0x000055796581e9a2 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x41149a2)
#19 0x0000557963118aa6 llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x1a0eaa6)
#20 0x000055796581e3c1 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x41143c1)
#21 0x0000557966172dc6 (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
#22 0x0000557966176a83 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/suz-local/software/local/clang-trunk/bin/clang-21+0x4a6ca83)
#23 0x0000557966880b3e clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x5176b3e)
#24 0x00005579681f598c clang::ParseAST(clang::Sema&, bool, bool) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x6aeb98c)
#25 0x0000557966880f78 clang::CodeGenAction::ExecuteAction() (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x5176f78)
#26 0x0000557966b53249 clang::FrontendAction::Execute() (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x5449249)
#27 0x0000557966ad3e2e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x53c9e2e)
#28 0x0000557966c47fb6 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x553dfb6)
#29 0x0000557962cb4a87 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x15aaa87)
#30 0x0000557962cac33a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x0000557962cb0471 clang_main(int, char**, llvm::ToolContext const&) (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x15a6471)
#32 0x0000557962b9b29b main (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x149129b)
#33 0x00007f876615d083 __libc_start_main /build/glibc-LcI20x/glibc-2.31/csu/../csu/libc-start.c:342:3
#34 0x0000557962cabdce _start (/local/suz-local/software/local/clang-trunk/bin/clang-21+0x15a1dce)
clangtk: error: unable to execute command: Aborted
clangtk: 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 642e84f0012b6e3a0e4f187bad5ee1775c3d623a)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/software/local/clang-trunk/bin
Build config: +assertions
clangtk: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clangtk: note: diagnostic msg: /tmp/small-6e398f.c
clangtk: note: diagnostic msg: /tmp/small-6e398f.sh
clangtk: note: diagnostic msg:
********************
[529] %
[529] % cat small.c
int a, b, c, d, e, f, g;
unsigned long h;
long i, j;
int main() {
long l = 0, m;
while (f)
n:
while (g) {
long o = h = l;
m = ~(m && 1);
j = h % m;
p:
if (b && j)
break;
m = o;
}
int k = l;
if (c) {
ac:
l = c;
if (k)
goto ac;
long n = e;
ag:
i = d;
if (n)
goto n;
}
if (a)
goto ag;
if (i)
goto p;
}
```
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