<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/114371>114371</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
clang crashes on valid code at -O{2,3} on x86_64-linux-gnu: Assertion `(I->use_empty() || all_of(I->uses(), [&](Use &U) { return isDeleted( cast<Instruction>(U.getUser())); })) && "trying to erase instruction with users."' failed
</td>
</tr>
<tr>
<th>Labels</th>
<td>
clang
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
zhendongsu
</td>
</tr>
</table>
<pre>
It appears to be a recent regression as it doesn't reproduce with 19.1.0 and earlier.
Compiler Explorer: https://godbolt.org/z/5Tca1zsE8
```
[507] % clangtk -v
clang version 20.0.0git (https://github.com/llvm/llvm-project.git fdc78120bde1426b223196bec645b6f27fc60f0e)
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
[508] %
[508] % clangtk -O2 small.c
clang-20: /local/suz-local/software/clangbuild/llvm-project/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp:2748: void llvm::slpvectorizer::BoUpSLP::removeInstructionsAndOperands(llvm::ArrayRef<U*>) [with T = llvm::Instruction]: Assertion `(I->use_empty() || all_of(I->uses(), [&](Use &U) { return isDeleted( cast<Instruction>(U.getUser())); })) && "trying to erase instruction with users."' 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-20 -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/20241031-clangtk-m64-O3-build-070121/delta -fcoverage-compilation-dir=/local/suz-local/software/emitesting/bugs/20241031-clangtk-m64-O3-build-070121/delta -resource-dir /local/suz-local/software/local/clang-trunk/lib/clang/20 -I /usr/local/include -I /local/suz-local/software/local/include -internal-isystem /local/suz-local/software/local/clang-trunk/lib/clang/20/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 -O2 -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-2a4e26.o -x c small.c
1. <eof> parser at end of file
2. Optimizer
3. Running pass "function<eager-inv>(float2int,lower-constant-intrinsics,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<O2>,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 0x000055e84bc23a6f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x4428a6f)
#1 0x000055e84bc21274 SignalHandler(int) Signals.cpp:0:0
#2 0x00007efe85a5c420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x00007efe8549300b raise /build/glibc-LcI20x/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#4 0x00007efe85472859 abort /build/glibc-LcI20x/glibc-2.31/stdlib/abort.c:81:7
#5 0x00007efe85472729 get_sysdep_segment_value /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:509:8
#6 0x00007efe85472729 _nl_load_domain /build/glibc-LcI20x/glibc-2.31/intl/loadmsgcat.c:970:34
#7 0x00007efe85483fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
#8 0x000055e84d68990f void llvm::slpvectorizer::BoUpSLP::removeInstructionsAndOperands<llvm::Instruction>(llvm::ArrayRef<llvm::Instruction*>) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5e8e90f)
#9 0x000055e84d6e6d28 llvm::slpvectorizer::BoUpSLP::vectorizeTree(llvm::SmallDenseSet<llvm::Value*, 4u, llvm::DenseMapInfo<llvm::Value*, void>> const&, llvm::Instruction*) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5eebd28)
#10 0x000055e84d6f8d01 (anonymous namespace)::HorizontalReduction::tryToReduce(llvm::slpvectorizer::BoUpSLP&, llvm::DataLayout const&, llvm::TargetTransformInfo*, llvm::TargetLibraryInfo const&) SLPVectorizer.cpp:0:0
#11 0x000055e84d6fbb89 llvm::SLPVectorizerPass::vectorizeHorReduction(llvm::PHINode*, llvm::Instruction*, llvm::BasicBlock*, llvm::slpvectorizer::BoUpSLP&, llvm::SmallVectorImpl<llvm::WeakTrackingVH>&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5f00b89)
#12 0x000055e84d7004ab llvm::SLPVectorizerPass::vectorizeRootInstruction(llvm::PHINode*, llvm::Instruction*, llvm::BasicBlock*, llvm::slpvectorizer::BoUpSLP&) (.constprop.0) SLPVectorizer.cpp:0:0
#13 0x000055e84d704d60 llvm::SLPVectorizerPass::vectorizeChainsInBlock(llvm::BasicBlock*, llvm::slpvectorizer::BoUpSLP&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5f09d60)
#14 0x000055e84d70b5a0 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 0x000055e84d70c273 llvm::SLPVectorizerPass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5f11273)
#16 0x000055e84d17e016 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-20+0x5983016)
#17 0x000055e84b5aa8b1 llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x3daf8b1)
#18 0x000055e84909b826 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-20+0x18a0826)
#19 0x000055e84b5a921d llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x3dae21d)
#20 0x000055e84909a226 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-20+0x189f226)
#21 0x000055e84b5a8c51 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x3dadc51)
#22 0x000055e84bedd2d3 (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 0x000055e84bee0aca 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*) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x46e5aca)
#24 0x000055e84c5df37c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x4de437c)
#25 0x000055e84e4e0fac clang::ParseAST(clang::Sema&, bool, bool) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x6ce5fac)
#26 0x000055e84c5df798 clang::CodeGenAction::ExecuteAction() (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x4de4798)
#27 0x000055e84c8a7649 clang::FrontendAction::Execute() (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x50ac649)
#28 0x000055e84c823e7e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5028e7e)
#29 0x000055e84c993f46 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x5198f46)
#30 0x000055e848c544f5 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x14594f5)
#31 0x000055e848c4c01a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#32 0x000055e848c4ffd7 clang_main(int, char**, llvm::ToolContext const&) (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x1454fd7)
#33 0x000055e848b3a78b main (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x133f78b)
#34 0x00007efe85474083 __libc_start_main /build/glibc-LcI20x/glibc-2.31/csu/../csu/libc-start.c:342:3
#35 0x000055e848c4baae _start (/local/suz-local/software/local/clang-trunk/bin/clang-20+0x1450aae)
clangtk: error: unable to execute command: Aborted
clangtk: 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 fdc78120bde1426b223196bec645b6f27fc60f0e)
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-8056bb.c
clangtk: note: diagnostic msg: /tmp/small-8056bb.sh
clangtk: note: diagnostic msg:
********************
[509] %
[509] % cat small.c
short a;
int b, d;
unsigned short c;
int main() {
b = 0;
for (; b < 5; b++) {
a--;
d |= (3 - (((!a) < 1) < c && a)) & c;
}
return 0;
}
```
</pre>
<img width="1px" height="1px" alt="" 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AHK_W2UcN8SoUJpH87iua9coNT_DMjcfwa9EaIYH_RFiPuLKbHTIYsR7gJj94mo7x0vULT7wXYXR-jzPZIDsf0Fk550f2HlWdJ93fElPP_9hZ_FfBpP6Rc4iyZxGKfTNEu_bM5cVhnxSThmGU0ymJIkStM0TabROJ9Oi_CLONsdmg8nZEzSUULTMRkDy8aTpMhoFiQh1FRUIxe3RkqXX_xNk7MoSuJJ9KWiOVTG33IkpD9aToJ0-UWf-UDnT-YnYSWMNc8krLAVnHVh1F9PAYOURFtaCRdEOCBqEb4KJnMSkEUcTJau-sWxm_-Nt4fQl1ZXZ79-Paj32_aM_P8AAAD__8HnWiI">