amyk added a comment.
In D125506#3528380 <https://reviews.llvm.org/D125506#3528380>, @nathanchance
wrote:
> I bisected a crash when compiling the Linux kernel to this change.
>
> A reduced C reproducer:
>
> enum {
> OP_CB_GETATTR = 3,
> OP_CB_RECALL,
> OP_CB_RECALL_ANY = 8,
> OP_CB_RECALL_SLOT = 10,
> OP_CB_NOTIFY_LOCK = 13,
> OP_CB_NOTIFY_DEVICEID,
> OP_CB_OFFLOAD
> } static callback_ops_0;
> int preprocess_nfs42_op_op_nr, preprocess_nfs42_op_op;
> void preprocess_nfs42_op() {
> switch (preprocess_nfs42_op_op_nr)
> case OP_CB_GETATTR:
> case OP_CB_RECALL:
> case OP_CB_RECALL_ANY:
> case OP_CB_RECALL_SLOT:
> case OP_CB_NOTIFY_DEVICEID:
> case OP_CB_NOTIFY_LOCK:
> preprocess_nfs42_op_op = preprocess_nfs42_op_op_nr;
> if (preprocess_nfs42_op_op_nr == OP_CB_OFFLOAD)
> preprocess_nfs42_op_op = callback_ops_0;
> }
>
>
>
> $ clang --version | head -1
> ClangBuiltLinux clang version 15.0.0 (https://github.com/llvm/llvm-project
> 559b8fc17ef6f5a65ccf9a11fce5f91c0a011b00)
>
> $ clang --target=powerpc64le-linux-gnu -O2 -Wall -Wextra -c -o /dev/null
> callback_xdr.i
>
>
>
> $ clang --version | head -1
> ClangBuiltLinux clang version 15.0.0 (https://github.com/llvm/llvm-project
> c35ca3a1c78f693b749ad11742350b7fc6c5cd89)
>
> $ clang --target=powerpc64le-linux-gnu -O2 -Wall -Wextra -c -o /dev/null
> callback_xdr.i
> Impossible reg-to-reg copy
> UNREACHABLE executed at
> /home/nathan/cbl/src/llvm-project/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp:1861!
> 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: clang --target=powerpc64le-linux-gnu -O2 -Wall
> -Wextra -c -o /dev/null callback_xdr.i
> 1. <eof> parser at end of file
> 2. Code generation
> 3. Running pass 'Function Pass Manager' on module 'callback_xdr.i'.
> 4. Running pass 'Post-RA pseudo instruction expansion pass' on
> function '@preprocess_nfs42_op'
> #0 0x000055a3bcb4e583 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3351583)
> #1 0x000055a3bcb4c50e llvm::sys::RunSignalHandlers()
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x334f50e)
> #2 0x000055a3bcad2923 (anonymous
> namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long)
> CrashRecoveryContext.cpp:0:0
> #3 0x000055a3bcad2a9e CrashRecoverySignalHandler(int)
> CrashRecoveryContext.cpp:0:0
> #4 0x00007f4af3152b00 __restore_rt (/lib64/libc.so.6+0x3eb00)
> #5 0x00007f4af31a2d0c __pthread_kill_implementation
> (/lib64/libc.so.6+0x8ed0c)
> #6 0x00007f4af3152a56 gsignal (/lib64/libc.so.6+0x3ea56)
> #7 0x00007f4af313c7f4 abort (/lib64/libc.so.6+0x287f4)
> #8 0x000055a3bcad787f
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x32da87f)
> #9 0x000055a3bb83b308
> llvm::PPCInstrInfo::copyPhysReg(llvm::MachineBasicBlock&,
> llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::DebugLoc
> const&, llvm::MCRegister, llvm::MCRegister, bool) const PPCInstrInfo.cpp:0:0
> #10 0x000055a3bc1242bb (anonymous
> namespace)::ExpandPostRA::runOnMachineFunction(llvm::MachineFunction&)
> ExpandPostRAPseudos.cpp:0:0
> #11 0x000055a3bbf62d4d
> llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x2765d4d)
> #12 0x000055a3bc3fc107 llvm::FPPassManager::runOnFunction(llvm::Function&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x2bff107)
> #13 0x000055a3bc403b81 llvm::FPPassManager::runOnModule(llvm::Module&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x2c06b81)
> #14 0x000055a3bc3fcafc llvm::legacy::PassManagerImpl::run(llvm::Module&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x2bffafc)
> #15 0x000055a3bd2fd16d clang::EmitBackendOutput(clang::DiagnosticsEngine&,
> clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
> clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef,
> llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream,
> std::default_delete<llvm::raw_pwrite_stream>>)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3b0016d)
> #16 0x000055a3bd6a27ee
> clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
> CodeGenAction.cpp:0:0
> #17 0x000055a3bdf46cb4 clang::ParseAST(clang::Sema&, bool, bool)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x4749cb4)
> #18 0x000055a3bd5f0f50 clang::FrontendAction::Execute()
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3df3f50)
> #19 0x000055a3bd565d1f
> clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3d68d1f)
> #20 0x000055a3bd69be92
> clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3e9ee92)
> #21 0x000055a3bb785028 cc1_main(llvm::ArrayRef<char const*>, char const*,
> void*) (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x1f88028)
> #22 0x000055a3bb782f2f ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
> driver.cpp:0:0
> #23 0x000055a3bd3ea372 void llvm::function_ref<void
> ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>,
> std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char>>*, bool*) const::$_1>(long) Job.cpp:0:0
> #24 0x000055a3bcad2837
> llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x32d5837)
> #25 0x000055a3bd3e9ecf
> clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>,
> std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char>>*, bool*) const
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3bececf)
> #26 0x000055a3bd3aaa68
> clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
> clang::driver::Command const*&) const
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3bada68)
> #27 0x000055a3bd3aad37
> clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
> llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) const
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3badd37)
> #28 0x000055a3bd3c5658
> clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
> llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&)
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x3bc8658)
> #29 0x000055a3bb7828a2 main
> (/home/nathan/tmp/build/llvm-bisect/stage1/bin/clang-15+0x1f858a2)
> #30 0x00007f4af313d550 __libc_start_call_main (/lib64/libc.so.6+0x29550)
> #31 0x00007f4af313d609 __libc_start_main@GLIBC_2.2.5
> (/lib64/libc.so.6+0x29609)
> #32 0x000055a3bb77fe85 _start
> /build/glibc/src/glibc/csu/../sysdeps/x86_64/start.S:117:0
> clang-15: error: clang frontend command failed with exit code 134 (use -v
> to see invocation)
> ClangBuiltLinux clang version 15.0.0 (https://github.com/llvm/llvm-project
> c35ca3a1c78f693b749ad11742350b7fc6c5cd89)
> Target: powerpc64le-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/nathan/tmp/build/llvm-bisect/stage1/bin
> clang-15: note: diagnostic msg: Error generating preprocessed source(s) -
> no preprocessable inputs.
Thanks for reporting this issue, @nathanchance. Sorry for the delayed response.
Just wanted to say that I've seen your response now and I will be investigating
this.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D125506/new/
https://reviews.llvm.org/D125506
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