.data label1: .byte label2 - label1 .rept 255 .byte 0 .endr label2: 

llvm-mc -triple=i386 test.S -filetype=obj -o test.o 

llvm-mc: /root/llvm-project/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp:714: virtual void {anonymous}::X86AsmBackend::applyFixup(const llvm::MCFragment&, const llvm::MCFixup&, const llvm::MCValue&, uint8_t*, uint64_t, bool): Assertion `(Size == 0 || isIntN(Size * 8 + 1, SignedValue)) && "Value does not fit in the Fixup field"' failed. PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug. Stack dump: 0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc -filetype=obj -o example.o <source> #0 0x0000000000d33a18 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0xd33a18) #1 0x0000000000d30b64 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0 #2 0x0000708f01442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520) #3 0x0000708f014969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc) #4 0x0000708f01442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476) #5 0x0000708f014287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3) #6 0x0000708f0142871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b) #7 0x0000708f01439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96) #8 0x00000000009d1cac (anonymous namespace)::X86AsmBackend::applyFixup(llvm::MCFragment const&, llvm::MCFixup const&, llvm::MCValue const&, unsigned char*, unsigned long, bool) X86AsmBackend.cpp:0:0 #9 0x0000000000bbd819 llvm::MCAssembler::evaluateFixup(llvm::MCFragment const&, llvm::MCFixup&, llvm::MCValue&, unsigned long&, bool, unsigned char*) const (.constprop.0) MCAssembler.cpp:0:0 #10 0x0000000000bc2a0f llvm::MCAssembler::layout() (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0xbc2a0f) #11 0x0000000000bc2e89 llvm::MCAssembler::Finish() (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0xbc2e89) #12 0x0000000000be7a4c llvm::MCELFStreamer::finishImpl() (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0xbe7a4c) #13 0x0000000000c074d7 llvm::MCStreamer::finish(llvm::SMLoc) (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0xc074d7) #14 0x0000000000c8fa62 (anonymous namespace)::AsmParser::Run(bool, bool) AsmParser.cpp:0:0 #15 0x000000000040d714 main (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0x40d714) #16 0x0000708f01429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90) #17 0x0000708f01429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40) #18 0x0000000000480115 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/llvm-mc+0x480115) Program terminated with signal: SIGSEGV Compiler returned: 139