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Clang frontend command failed with exit code 139 when compiling to webassembly #97496

Open sumant85 opened 2 days ago

sumant85 commented 2 days ago

I am getting Clang frontend command failed with exit code 139 when compiling code using setjmp/longjmp to webassembly with emscripten 3.1.62. The same code compiles fine with an older (3.1.44) version of emscripten. The code also compiles if all calls to setjmp/longjmp are removed or if optimization level is set to -O0

Crash artifacts (preprocessed source and script)

Breaking change bisected to https://chromium.googlesource.com/emscripten-releases/+/9e09d60dbf6f5e1e0b4bb97b8aba8c5d5969652a

Backtrace:

0.  Program arguments: /home/code/emscripten/emsdk/upstream/bin/clang++ -target wasm32-unknown-emscripten -mllvm -combiner-global-alias-analysis=false -mllvm -wasm-enable-sjlj -mllvm -disable-lsr --sysroot=/home/code/emscripten/emsdk/upstream/emscripten/cache/sysroot -DEMSCRIPTEN -Xclang -iwithsysroot/include/fakesdl -Xclang -iwithsysroot/include/compat -I/Users/home/code/libcvd -I/home/code/libcvd/build/include -isystem /home/code/toon/include/toon -isystem /home/code/jpeg/include/S -isystem /home/code/libpng/include/png -isystem //home/code/zlib/include/zlib -fwasm-exceptions -Wno-error=enum-constexpr-conversion -fcolor-diagnostics -Oz -DNDEBUG -std=gnu++20 -fvisibility=hidden -MD -c /home/code/libcvd/cvd_src/image_io/jpeg.cxx -o /tmp/jpeg.cxx.o
1.  <eof> parser at end of file
2.  Code generation
3.  Running pass 'Function Pass Manager' on module '/home/code/libcvd/cvd_src/image_io/jpeg.cxx'.
4.  Running pass 'WebAssembly Instruction Selection' on function '@_ZN3CVD4JPEG9ReadPimplC2ERNSt3__213basic_istreamIcNS2_11char_traitsIcEEEE'
 #0 0x000000010616eb48 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013eab48)

 #1 0x000000010616c255 llvm::sys::RunSignalHandlers() (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013e8255)
 #2 0x000000010616df0e llvm::sys::CleanupOnSignal(unsigned long) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013e9f0e)
 #3 0x00000001060ca181 CrashRecoverySignalHandler(int) (.llvm.957067972329857832) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101346181)
 #4 0x00007ff818abafdd (/usr/lib/system/libsystem_platform.dylib+0x7ff80046afdd)
 #5 0x000000031507bb20
 #6 0x000000010738dca7 llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x102609ca7)
 #7 0x00000001075188d4 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true, llvm::BasicBlock>, false, true>, llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true, llvm::BasicBlock>, false, true>, bool&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1027948d4)
 #8 0x0000000107518432 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x102794432)
 #9 0x00000001075151fc llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1027911fc)
#10 0x000000010751341e llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10278f41e)
#11 0x00000001056d52f8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1009512f8)
#12 0x0000000105c2af05 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100ea6f05)
#13 0x0000000105c34d94 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100eb0d94)
#14 0x0000000105c2bcd5 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100ea7cd5)
#15 0x0000000106a9e340 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::__2::unique_ptr<llvm::raw_pwrite_stream, std::__2::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101d1a340)
#16 0x000000010690306c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101b7f06c)
#17 0x0000000107e2dcf9 clang::ParseAST(clang::Sema&, bool, bool) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1030a9cf9)
#18 0x0000000106e741f5 clang::FrontendAction::Execute() (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1020f01f5)
#19 0x0000000106dae570 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10202a570)
#20 0x0000000106f70a5a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1021eca5a)
#21 0x0000000104e21480 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10009d480)
#22 0x0000000104e1db2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100099b2a)
#23 0x0000000106bee02e void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__2::optional<llvm::StringRef>>, std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>*, bool*) const::$_0>(long) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e6a02e)
#24 0x00000001060c9ed8 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101345ed8)
#25 0x0000000106bed8c3 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__2::optional<llvm::StringRef>>, std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>*, bool*) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e698c3)
#26 0x0000000106ba6d79 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e22d79)
#27 0x0000000106ba705f clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__2::pair<int, clang::driver::Command const*>>&, bool) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e2305f)
#28 0x0000000106bcb730 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__2::pair<int, clang::driver::Command const*>>&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e47730)
#29 0x0000000104e1cc33 clang_main(int, char**, llvm::ToolContext const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100098c33)
#30 0x0000000104e2da2c main (/home/code/emsdk/upstream/bin/clang-19+0x1000a9a2c)
#31 0x000000020c21c366
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
clang version 19.0.0git (https:/github.com/llvm/llvm-project c00ada070207979f092be9046a02fcfff8b9f9ce)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /home/code/emscripten/emsdk/upstream/bin
clang++: note: diagnostic msg:
llvmbot commented 2 days ago

@llvm/issue-subscribers-backend-webassembly

Author: Sumant Hanumante (sumant85)

I am getting `Clang frontend command failed with exit code 139` when compiling code using setjmp/longjmp to webassembly with emscripten 3.1.62. The same code compiles fine with an older (3.1.44) version of emscripten. The code also compiles if all calls to setjmp/longjmp are removed or if optimization level is set to `-O0` [Crash artifacts (preprocessed source and script)](https://github.com/user-attachments/files/16075525/crash.zip) Backtrace: ``` 0. Program arguments: /home/code/emscripten/emsdk/upstream/bin/clang++ -target wasm32-unknown-emscripten -mllvm -combiner-global-alias-analysis=false -mllvm -wasm-enable-sjlj -mllvm -disable-lsr --sysroot=/home/code/emscripten/emsdk/upstream/emscripten/cache/sysroot -DEMSCRIPTEN -Xclang -iwithsysroot/include/fakesdl -Xclang -iwithsysroot/include/compat -I/Users/home/code/libcvd -I/home/code/libcvd/build/include -isystem /home/code/toon/include/toon -isystem /home/code/jpeg/include/S -isystem /home/code/libpng/include/png -isystem //home/code/zlib/include/zlib -fwasm-exceptions -Wno-error=enum-constexpr-conversion -fcolor-diagnostics -Oz -DNDEBUG -std=gnu++20 -fvisibility=hidden -MD -c /home/code/libcvd/cvd_src/image_io/jpeg.cxx -o /tmp/jpeg.cxx.o 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module '/home/code/libcvd/cvd_src/image_io/jpeg.cxx'. 4. Running pass 'WebAssembly Instruction Selection' on function '@_ZN3CVD4JPEG9ReadPimplC2ERNSt3__213basic_istreamIcNS2_11char_traitsIcEEEE' #0 0x000000010616eb48 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013eab48) #1 0x000000010616c255 llvm::sys::RunSignalHandlers() (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013e8255) #2 0x000000010616df0e llvm::sys::CleanupOnSignal(unsigned long) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1013e9f0e) #3 0x00000001060ca181 CrashRecoverySignalHandler(int) (.llvm.957067972329857832) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101346181) #4 0x00007ff818abafdd (/usr/lib/system/libsystem_platform.dylib+0x7ff80046afdd) #5 0x000000031507bb20 #6 0x000000010738dca7 llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x102609ca7) #7 0x00000001075188d4 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true, llvm::BasicBlock>, false, true>, llvm::ilist_iterator_w_bits<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void, true, llvm::BasicBlock>, false, true>, bool&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1027948d4) #8 0x0000000107518432 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x102794432) #9 0x00000001075151fc llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1027911fc) #10 0x000000010751341e llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10278f41e) #11 0x00000001056d52f8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1009512f8) #12 0x0000000105c2af05 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100ea6f05) #13 0x0000000105c34d94 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100eb0d94) #14 0x0000000105c2bcd5 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100ea7cd5) #15 0x0000000106a9e340 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::__2::unique_ptr<llvm::raw_pwrite_stream, std::__2::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101d1a340) #16 0x000000010690306c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101b7f06c) #17 0x0000000107e2dcf9 clang::ParseAST(clang::Sema&, bool, bool) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1030a9cf9) #18 0x0000000106e741f5 clang::FrontendAction::Execute() (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1020f01f5) #19 0x0000000106dae570 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10202a570) #20 0x0000000106f70a5a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x1021eca5a) #21 0x0000000104e21480 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x10009d480) #22 0x0000000104e1db2a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100099b2a) #23 0x0000000106bee02e void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__2::optional<llvm::StringRef>>, std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>*, bool*) const::$_0>(long) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e6a02e) #24 0x00000001060c9ed8 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101345ed8) #25 0x0000000106bed8c3 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::__2::optional<llvm::StringRef>>, std::__2::basic_string<char, std::__2::char_traits<char>, std::__2::allocator<char>>*, bool*) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e698c3) #26 0x0000000106ba6d79 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e22d79) #27 0x0000000106ba705f clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__2::pair<int, clang::driver::Command const*>>&, bool) const (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e2305f) #28 0x0000000106bcb730 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__2::pair<int, clang::driver::Command const*>>&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x101e47730) #29 0x0000000104e1cc33 clang_main(int, char**, llvm::ToolContext const&) (/home/code/emscripten/emsdk/upstream/bin/clang-19+0x100098c33) #30 0x0000000104e2da2c main (/home/code/emsdk/upstream/bin/clang-19+0x1000a9a2c) #31 0x000000020c21c366 clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation) clang version 19.0.0git (https:/github.com/llvm/llvm-project c00ada070207979f092be9046a02fcfff8b9f9ce) Target: wasm32-unknown-emscripten Thread model: posix InstalledDir: /home/code/emscripten/emsdk/upstream/bin clang++: note: diagnostic msg: ```
sbc100 commented 2 days ago

@aheejin any ideas what this might be?

@sumant85 any chance you could bisect a little more to figure out exactly which emscripten version caused the regression: https://emscripten.org/docs/contributing/developers_guide.html#bisecting

aheejin commented 2 days ago

I have a suspicion that this is the same issue as https://github.com/emscripten-core/emscripten/issues/22170. The pass that's causing the error is https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/WebAssembly/WebAssemblyLowerEmscriptenEHSjLj.cpp, and the problem is related to generating invalid PHI nodes, which I'm currently investigating. But given that this pass has been stable for a long time, it's a little confusing why two same bug reports are coming at this point. The most recent change to that pass was #84137, but I doubt that PR created another bug.. I think it's possible that PR might have uncovered an existing bug or something. I'm still investigating.

Added: The same error persists even if I revert #84137, so that's not the issue.

sumant85 commented 2 days ago

@sbc100 I've bisected it down to emsdk version 3.1.54 where compilation first started failing. Will do a bisect over emscripten release (per https://emscripten.org/docs/contributing/developers_guide.html#bisecting) and share my findings shortly

sumant85 commented 2 days ago

@sbc100 @aheejin the breaking change is introduced in https://chromium.googlesource.com/emscripten-releases/+/9e09d60dbf6f5e1e0b4bb97b8aba8c5d5969652a