https://llvm.org/bugs/show_bug.cgi?id=25291
Bug ID: 25291 Summary: clang crashes on valid code at -Os and above on x86_64-linux-gnu (in 64-bit mode) Product: clang Version: trunk Hardware: PC OS: All Status: NEW Severity: normal Priority: P Component: -New Bugs Assignee: unassignedclangb...@nondot.org Reporter: s...@cs.ucdavis.edu CC: llvm-bugs@lists.llvm.org Classification: Unclassified The current clang trunk (as well as 3.6.x and 3.7.x) crashes when compiling the following test case at -Os and above on x86_64-linux-gnu in the 64-bit mode (but not in 32-bit mode). This is a regression from 3.5.x. $ clang-trunk -v clang version 3.8.0 (trunk 250927) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/tools/bin Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2 Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Candidate multilib: x32;@mx32 Selected multilib: .;@m64 $ $ clang-trunk -m32 -Os -c small.c $ clang-trunk -m64 -O1 -c small.c $ clang-3.5 -m64 -Os -c small.c $ $ clang-trunk -m64 -Os -c small.c clang: /tmp/llvm/lib/IR/Value.cpp:354: void llvm::Value::replaceAllUsesWith(llvm::Value *): Assertion `!contains(New, this) && "this->replaceAllUsesWith(expr(this)) is NOT valid!"' failed. #0 0x2e701dd llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/local/clang-trunk/bin/clang+0x2e701dd) #1 0x2e6f866 llvm::sys::RunSignalHandlers() (/usr/local/clang-trunk/bin/clang+0x2e6f866) #2 0x2e719fe (/usr/local/clang-trunk/bin/clang+0x2e719fe) #3 0x7fb0332c9340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340) #4 0x7fb032264cc9 gsignal /build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0 #5 0x7fb0322680d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0 #6 0x7fb03225db86 __assert_fail_base /build/buildd/eglibc-2.19/assert/assert.c:92:0 #7 0x7fb03225dc32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32) #8 0x2decc01 llvm::Value::replaceAllUsesWith(llvm::Value*) (/usr/local/clang-trunk/bin/clang+0x2decc01) #9 0x275c3e9 (/usr/local/clang-trunk/bin/clang+0x275c3e9) #10 0x2759d95 (/usr/local/clang-trunk/bin/clang+0x2759d95) #11 0x2dbf5f4 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/local/clang-trunk/bin/clang+0x2dbf5f4) #12 0x2a68688 (/usr/local/clang-trunk/bin/clang+0x2a68688) #13 0x2dbfd15 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/local/clang-trunk/bin/clang+0x2dbfd15) #14 0x9ecaf3 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang+0x9ecaf3) #15 0x9cf0c3 (/usr/local/clang-trunk/bin/clang+0x9cf0c3) #16 0xc5fb66 clang::ParseAST(clang::Sema&, bool, bool) (/usr/local/clang-trunk/bin/clang+0xc5fb66) #17 0x77e695 clang::FrontendAction::Execute() (/usr/local/clang-trunk/bin/clang+0x77e695) #18 0x74b10b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/local/clang-trunk/bin/clang+0x74b10b) #19 0x72a82e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/clang-trunk/bin/clang+0x72a82e) #20 0x7208d3 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/local/clang-trunk/bin/clang+0x7208d3) #21 0x728e23 main (/usr/local/clang-trunk/bin/clang+0x728e23) #22 0x7fb03224fec5 __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:321:0 #23 0x720369 _start (/usr/local/clang-trunk/bin/clang+0x720369) Stack dump: 0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c -mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version 2.24 -momit-leaf-frame-pointer -dwarf-column-info -coverage-file /data2/small.c -resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.8.0 -internal-isystem /usr/local/include -internal-isystem /usr/local/clang-trunk/bin/../lib/clang/3.8.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Os -fdebug-compilation-dir /data2 -ferror-limit 19 -fmessage-length 148 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o small.o -x c small.c 1. <eof> parser at end of file 2. Per-module optimization passes 3. Running pass 'CallGraph Pass Manager' on module 'small.c'. 4. Running pass 'Global Value Numbering' on function '@fn1' clang: error: unable to execute command: Aborted (core dumped) clang: error: clang frontend command failed due to signal (use -v to see invocation) clang version 3.8.0 (trunk 250927) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/tools/bin clang: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and associated run script. clang: note: diagnostic msg: ******************** PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang: note: diagnostic msg: /tmp/small-061fd2.c clang: note: diagnostic msg: /tmp/small-061fd2.sh clang: note: diagnostic msg: ******************** $ -------------------------------------- int printf (const char *, ...); int a[1], b[1][1], c, d; void fn1 (int p1) { for (; d; d++) goto lbl; if (0) lbl: c--; else b[p1][0] = 0; printf ("%d\n", a[p1]); goto lbl; } -- You are receiving this mail because: You are on the CC list for the bug.
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