Vincent Li <vincent.mc.li@xxxxxxxxx> 于2021年8月2日周一 上午5:46写道： > > On Sun, Aug 1, 2021 at 9:48 AM 范开喜 <fankaixi.li@xxxxxxxxxxxxx> wrote: > > > > Hi all, > > > > I failed to make bpf selftest testcases based on the upstream master > > branch. And I need help to fix it. > > > > After installing the new kernel and modules, I have tried following > > commands to build bpf testcases: > > " > > cd ~/dev/linux/tools/testing/selftests/bpf > > make > > " > > > > Then error message shows up as follows: > > " > > INSTALL bpftool > > GEN vmlinux.h > > CLNG-BPF [test_maps] btf__core_reloc_primitives___err_non_ptr.o > > CLNG-BPF [test_maps] test_global_data.o > > CLNG-BPF [test_maps] test_global_func8.o > > CLNG-BPF [test_maps] test_ksyms_btf_null_check.o > > CLNG-BPF [test_maps] linked_funcs2.o > > CLNG-BPF [test_maps] bpf_iter_test_kern5.o > > CLNG-BPF [test_maps] test_static_linked2.o > > CLNG-BPF [test_maps] test_global_func13.o > > CLNG-BPF [test_maps] test_cls_redirect_subprogs.o > > CLNG-BPF [test_maps] test_core_reloc_nesting.o > > CLNG-BPF [test_maps] tailcall_bpf2bpf1.o > > CLNG-BPF [test_maps] test_endian.o > > CLNG-BPF [test_maps] test_cls_redirect.o > > CLNG-BPF [test_maps] btf__core_reloc_type_based___incompat.o > > CLNG-BPF [test_maps] test_btf_newkv.o > > CLNG-BPF [test_maps] pyperf600.o > > CLNG-BPF [test_maps] test_btf_nokv.o > > CLNG-BPF [test_maps] atomics.o > > fatal error: error in backend: line 27: Invalid usage of the XADD return value > > PLEASE submit a bug report to https://bugs.llvm.org/ and include the > > crash backtrace, preprocessed source, and associated run script. > > Stack dump: > > 0. Program arguments: clang -g -D__TARGET_ARCH_x86 > > -mlittle-endian > > -I/root/dev/linux/tools/testing/selftests/bpf/tools/include > > -I/root/dev/linux/tools/testing/selftests/bpf > > -I/root/dev/linux/tools/include/uapi > > -I/root/dev/linux/tools/testing/selftests/usr/include -idirafter > > /usr/local/include -idirafter > > /usr/lib/llvm-11/lib/clang/11.1.0/include -idirafter > > /usr/include/x86_64-linux-gnu -idirafter /usr/include > > -Wno-compare-distinct-pointer-types -DENABLE_ATOMICS_TESTS -O2 -target > > bpf -c progs/atomics.c -o > > /root/dev/linux/tools/testing/selftests/bpf/atomics.o -mcpu=v3 > > 1. <eof> parser at end of file > > 2. Code generation > > 3. Running pass 'Function Pass Manager' on module 'progs/atomics.c'. > > 4. Running pass 'BPF PreEmit Checking' on function '@add' > > #0 0x00007f81ec29ee8f llvm::sys::PrintStackTrace(llvm::raw_ostream&) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbbae8f) > > #1 0x00007f81ec29d200 llvm::sys::RunSignalHandlers() > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbb9200) > > #2 0x00007f81ec29e5dd llvm::sys::CleanupOnSignal(unsigned long) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbba5dd) > > #3 0x00007f81ec1e6d2a (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb02d2a) > > #4 0x00007f81ec1e6ccb (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb02ccb) > > #5 0x00007f81ec299d4e (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbb5d4e) > > #6 0x00000000004134f2 (/usr/lib/llvm-11/bin/clang+0x4134f2) > > #7 0x00007f81ec1f2d4f llvm::report_fatal_error(llvm::Twine const&, > > bool) (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb0ed4f) > > #8 0x00007f81ec1f2e27 (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb0ee27) > > #9 0x00007f81edd55595 (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0x2671595) > > #10 0x00007f81ec57339e > > llvm::MachineFunctionPass::runOnFunction(llvm::Function&) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xe8f39e) > > #11 0x00007f81ec3ae889 > > llvm::FPPassManager::runOnFunction(llvm::Function&) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xcca889) > > #12 0x00007f81ec3b3eb3 llvm::FPPassManager::runOnModule(llvm::Module&) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xccfeb3) > > #13 0x00007f81ec3aeea0 > > llvm::legacy::PassManagerImpl::run(llvm::Module&) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xccaea0) > > #14 0x00007f81ea068e96 > > clang::EmitBackendOutput(clang::DiagnosticsEngine&, > > clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, > > clang::TargetOptions const&, clang::LangOptions const&, > > llvm::DataLayout const&, llvm::Module*, clang::BackendAction, > > std::unique_ptr<llvm::raw_pwrite_stream, > > std::default_delete<llvm::raw_pwrite_stream> >) > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x164de96) > > #15 0x00007f81ea329a36 (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x190ea36) > > #16 0x00007f81e93e9093 clang::ParseAST(clang::Sema&, bool, bool) > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x9ce093) > > #17 0x00007f81ea9c9c38 clang::FrontendAction::Execute() > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1faec38) > > #18 0x00007f81ea97ff11 > > clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1f64f11) > > #19 0x00007f81eaa2f6b0 > > clang::ExecuteCompilerInvocation(clang::CompilerInstance*) > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x20146b0) > > #20 0x00000000004131bf cc1_main(llvm::ArrayRef<char const*>, char > > const*, void*) (/usr/lib/llvm-11/bin/clang+0x4131bf) > > #21 0x00000000004115fe (/usr/lib/llvm-11/bin/clang+0x4115fe) > > #22 0x00007f81ea6a9a02 (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1c8ea02) > > #23 0x00007f81ec1e6cad > > llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) > > (/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xb02cad) > > #24 0x00007f81ea6a8f2f > > clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> > > >, std::__cxx11::basic_string<char, std::char_traits<char>, > > std::allocator<char> >*, bool*) const > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1c8df2f) > > #25 0x00007f81ea680d5f > > clang::driver::Compilation::ExecuteCommand(clang::driver::Command > > const&, clang::driver::Command const*&) const > > (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1c65d5f) > > #26 0x00007f81ea680f07 > > clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, > > llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> > > >&) const (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1c65f07) > > #27 0x00007f81ea694a7c > > clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, > > llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> > > >&) (/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1c79a7c) > > #28 0x00000000004110a3 main (/usr/lib/llvm-11/bin/clang+0x4110a3) > > #29 0x00007f81e855b09b __libc_start_main > > (/lib/x86_64-linux-gnu/libc.so.6+0x2409b) > > #30 0x000000000040e89a _start (/usr/lib/llvm-11/bin/clang+0x40e89a) > > make: *** [Makefile:470: > > /root/dev/linux/tools/testing/selftests/bpf/atomics.o] Error 1 > > " > > > > I am using a virtual machine with 8 cpus. The kernel and clang version are: > > " > > kernel: 5.14.0-rc3.bm.1-amd64 #4 SMP Sun Aug 1 23:28:24 CST 2021 > > x86_64 GNU/Linux > > clang: Debian clang version > > 11.1.0-++20210622113218+1fdec59bffc1-1~exp1~20210622213839.163 > > " > > I think I ran into same issue if I recall correctly, I downloaded > llvm-project 12.0.1 and follow the instruction in kernel > Documentation/bpf/bpf_devel_QA.rst > > " > Q: Got it, so how do I build LLVM manually anyway? > ....You need ninja, cmake and gcc-c++ as build requisites for LLVM. > Once you > have that set up, proceed with building the latest LLVM and clang > version > from the git repositories:: > > $ git clone https://github.com/llvm/llvm-project.git > $ mkdir -p llvm-project/llvm/build > $ cd llvm-project/llvm/build > $ cmake .. -G "Ninja" -DLLVM_TARGETS_TO_BUILD="BPF;X86" \ > -DLLVM_ENABLE_PROJECTS="clang" \ > -DCMAKE_BUILD_TYPE=Release \ > -DLLVM_BUILD_RUNTIME=OFF > $ ninja > " Thanks. I have tried on branch v5.10 and it works. I found some issues: 1. On debian 10 default clang version is 7.0 which is not compatible. I need to update clang to newer version like clang 12. You could download newer version from clang repo. 2. After updating clang version, I need to rebuild kernel and install it. Then I could build bpf selftest cases successfully.
