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Description
Clang crashes with segmentation fault when using__builtin_dump_struct for dumping a struct with 3 or more bit-fields
Also see same at:https://godbolt.org/z/WPzfs3M8q
Using clang-13 on fedora-35(64-bit)
Stack dump
0.Program arguments: /usr/bin/clang-13 -cc1 -triple x86_64-redhat-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-free -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/home/amiy/projects/lab-bt/crash -resource-dir /usr/lib64/clang/13.0.0 -internal-isystem /usr/lib64/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-redhat-linux/11/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir=/home/amiy/projects/lab-bt/crash -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/test-361c30.o -x c test.c1.<eof> parser at end of file2.test.c:9:5: LLVM IR generation of declaration 'main'3.test.c:9:5: Generating code for declaration 'main'Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):/lib64/libLLVM-13.so(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamEi+0x36)[0x7f95408ff9a6]/lib64/libLLVM-13.so(_ZN4llvm3sys17RunSignalHandlersEv+0x34)[0x7f95408fd734]/lib64/libLLVM-13.so(+0xb5d8b6)[0x7f95408fd8b6]/lib64/libc.so.6(+0x42750)[0x7f953f9b9750]/lib64/libLLVM-13.so(_ZN4llvm11PointerType3getEPNS_4TypeEj+0x15)[0x7f9540a81f05]/lib64/libclang-cpp.so.13(+0x1a919cd)[0x7f95478919cd]/lib64/libclang-cpp.so.13(+0x1b610ea)[0x7f95479610ea]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction15EmitBuiltinExprENS_10GlobalDeclEjPKNS_8CallExprENS0_15ReturnValueSlotE+0x9489)[0x7f954796ac69]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction12EmitCallExprEPKNS_8CallExprENS0_15ReturnValueSlotE+0x1ed)[0x7f9547a23e5d]/lib64/libclang-cpp.so.13(+0x1c63935)[0x7f9547a63935]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction14EmitScalarExprEPKNS_4ExprEb+0x66)[0x7f9547a64706]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction11EmitAnyExprEPKNS_4ExprENS0_12AggValueSlotEb+0xbf)[0x7f9547a0ab9f]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction15EmitIgnoredExprEPKNS_4ExprE+0x76)[0x7f9547a233c6]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction8EmitStmtEPKNS_4StmtEN4llvm8ArrayRefIPKNS_4AttrEEE+0x142)[0x7f9547b6a1c2]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction28EmitCompoundStmtWithoutScopeERKNS_12CompoundStmtEbNS0_12AggValueSlotE+0x92)[0x7f9547b70432]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction16EmitFunctionBodyEPKNS_4StmtE+0x4e)[0x7f9547bc1aae]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen15CodeGenFunction12GenerateCodeENS_10GlobalDeclEPN4llvm8FunctionERKNS0_14CGFunctionInfoE+0x203)[0x7f9547bcfa93]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen13CodeGenModule28EmitGlobalFunctionDefinitionENS_10GlobalDeclEPN4llvm11GlobalValueE+0x18e)[0x7f9547c0203e]/lib64/libclang-cpp.so.13(_ZN5clang7CodeGen13CodeGenModule20EmitGlobalDefinitionENS_10GlobalDeclEPN4llvm11GlobalValueE+0x25d)[0x7f9547bfe73d]/lib64/libclang-cpp.so.13(+0x1e04b17)[0x7f9547c04b17]/lib64/libclang-cpp.so.13(+0x1e6ab71)[0x7f9547c6ab71]/lib64/libclang-cpp.so.13(+0x1db1757)[0x7f9547bb1757]/lib64/libclang-cpp.so.13(_ZN5clang8ParseASTERNS_4SemaEbb+0x214)[0x7f95469dd3a4]/lib64/libclang-cpp.so.13(_ZN5clang14FrontendAction7ExecuteEv+0xc9)[0x7f954827bc69]/lib64/libclang-cpp.so.13(_ZN5clang16CompilerInstance13ExecuteActionERNS_14FrontendActionE+0x129)[0x7f9548219219]/lib64/libclang-cpp.so.13(_ZN5clang25ExecuteCompilerInvocationEPNS_16CompilerInstanceE+0x5ab)[0x7f95482eb64b]/usr/bin/clang-13(_Z8cc1_mainN4llvm8ArrayRefIPKcEES2_Pv+0x890)[0x562f0c070430]/usr/bin/clang-13(+0x137bc)[0x562f0c06d7bc]/usr/bin/clang-13(main+0x3ca)[0x562f0c069b4a]/lib64/libc.so.6(+0x2d560)[0x7f953f9a4560]/lib64/libc.so.6(__libc_start_main+0x7c)[0x7f953f9a460c]/usr/bin/clang-13(_start+0x25)[0x562f0c06cbf5]clang-13: error: unable to execute command: Segmentation fault (core dumped)clang-13: error: clang frontend command failed due to signal (use -v to see invocation)clang version 13.0.0 (Fedora 13.0.0-3.fc35)Target: x86_64-redhat-linux-gnuThread model: posixInstalledDir: /usr/binclang-13: note: diagnostic msg: ********************Source for reproducing
#include<stdio.h>typedefstructbitf_3 {unsignedatomic :1;unsignedanychar :1;unsignedis_group :1;}bitf_3;intmain() {bitf_3bf3= {0 };__builtin_dump_struct(&bf3,&printf);}
Associated run script:
# Crash reproducer for clang version 13.0.0 (Fedora 13.0.0-3.fc35)# Driver args: "test.c"# Original command: "/usr/bin/clang-13" "-cc1" "-triple" "x86_64-redhat-linux-gnu" "-emit-obj" "-mrelax-all" "--mrelax-relocations" "-disable-free" "-disable-llvm-verifier" "-discard-value-names" "-main-file-name" "test.c" "-mrelocation-model" "static" "-mframe-pointer=all" "-fmath-errno" "-fno-rounding-math" "-mconstructor-aliases" "-munwind-tables" "-target-cpu" "x86-64" "-tune-cpu" "generic" "-debugger-tuning=gdb" "-fcoverage-compilation-dir=/home/amiy/projects/lab-bt/crash" "-resource-dir" "/usr/lib64/clang/13.0.0" "-internal-isystem" "/usr/lib64/clang/13.0.0/include" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/usr/bin/../lib/gcc/x86_64-redhat-linux/11/../../../../x86_64-redhat-linux/include" "-internal-externc-isystem" "/include" "-internal-externc-isystem" "/usr/include" "-fdebug-compilation-dir=/home/amiy/projects/lab-bt/crash" "-ferror-limit" "19" "-fgnuc-version=4.2.1" "-fcolor-diagnostics" "-faddrsig" "-D__GCC_HAVE_DWARF2_CFI_ASM=1" "-o" "/tmp/test-361c30.o" "-x" "c" "test.c""/usr/bin/clang-13""-cc1""-triple""x86_64-redhat-linux-gnu""-emit-obj""-mrelax-all""--mrelax-relocations""-disable-free""-disable-llvm-verifier""-discard-value-names""-main-file-name""test.c""-mrelocation-model""static""-mframe-pointer=all""-fmath-errno""-fno-rounding-math""-mconstructor-aliases""-munwind-tables""-target-cpu""x86-64""-tune-cpu""generic""-debugger-tuning=gdb""-fcoverage-compilation-dir=/home/amiy/projects/lab-bt/crash""-fdebug-compilation-dir=/home/amiy/projects/lab-bt/crash""-ferror-limit""19""-fgnuc-version=4.2.1""-fcolor-diagnostics""-faddrsig""-D__GCC_HAVE_DWARF2_CFI_ASM=1""-x""c""test-d9989f.c"