objcopy crash

[douglas-raillard-arm]

llvm-objcopy dies when inspecting some sections of an object file generated by rustc.
The tool is in version 18, installed on Ubuntu following the llvm.sh recipe at https://apt.llvm.org/

llvm-objdump-18 -h /tmp/tmpoync5nx4/generated/rust/rust.o_objdump.o | awk '{ print $2 }' | grep '^.binstore.c.' | xargs -n1 sh -c 'cp -f /tmp/tmpoync5nx4/generated/rust/rust.o /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o && llvm-objcopy-18 --dump-section $0=/tmp/tmpoync5nx4/generated/rust/rust_c_shims/shim_$0 /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o /dev/null'
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: llvm-objcopy-18 --dump-section .binstore.c.header.__lisa_c_shim_constant_assert_50141894102302112148172994662096862652=/tmp/tmpoync5nx4/generated/rust/rust_c_shims/shim_.binstore.c.header.__lisa_c_shim_constant_assert_50141894102302112148172994662096862652 /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o /dev/null
 #0 0x00007f823c643716 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd94716)
 #1 0x00007f823c6416d0 llvm::sys::RunSignalHandlers() (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd926d0)
 #2 0x00007f823c643ddb (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd94ddb)
 #3 0x00007f823b49c520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007f823dd5a580 llvm::objcopy::elf::SectionWriter::visit(llvm::objcopy::elf::Section const&) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24ab580)
 #5 0x00007f823dd5b483 llvm::objcopy::elf::Section::accept(llvm::objcopy::elf::SectionVisitor&) const (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24ac483)
 #6 0x00007f823dd751c0 llvm::objcopy::elf::ELFWriter<llvm::object::ELFType<(llvm::endianness)1, true> >::write() (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24c61c0)
 #7 0x00007f823dd563bb (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24a73bb)
 #8 0x00007f823dd56701 llvm::objcopy::elf::executeObjcopyOnBinary(llvm::objcopy::CommonConfig const&, llvm::objcopy::ELFConfig const&, llvm::object::ELFObjectFileBase&, llvm::raw_ostream&) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24a7701)
 #9 0x00007f823dd494b7 llvm::objcopy::executeObjcopyOnBinary(llvm::objcopy::MultiFormatConfig const&, llvm::object::Binary&, llvm::raw_ostream&) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x249a4b7)
#10 0x00005631df095f69 (/usr/lib/llvm-18/bin/llvm-objcopy+0x21f69)
#11 0x00007f823c628390 llvm::writeToOutput(llvm::StringRef, std::function<llvm::Error (llvm::raw_ostream&)>) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd79390)
#12 0x00005631df0956f3 (/usr/lib/llvm-18/bin/llvm-objcopy+0x216f3)
#13 0x00005631df096006 (/usr/lib/llvm-18/bin/llvm-objcopy+0x22006)
#14 0x00007f823b483d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#15 0x00007f823b483e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#16 0x00005631df07cac5 (/usr/lib/llvm-18/bin/llvm-objcopy+0x8ac5)

[llvmbot]

@llvm/issue-subscribers-tools-llvm-objcopy-strip

Author: Douglas Raillard (douglas-raillard-arm)

llvm-objcopy dies when inspecting some sections of an object file generated by rustc. The tool is in version 18, installed on Ubuntu following the llvm.sh recipe at https://apt.llvm.org/

llvm-objdump-18 -h /tmp/tmpoync5nx4/generated/rust/rust.o_objdump.o | awk '{ print $2 }' | grep '^.binstore.c.' | xargs -n1 sh -c 'cp -f /tmp/tmpoync5nx4/generated/rust/rust.o /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o && llvm-objcopy-18 --dump-section $0=/tmp/tmpoync5nx4/generated/rust/rust_c_shims/shim_$0 /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o /dev/null'
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: llvm-objcopy-18 --dump-section .binstore.c.header.__lisa_c_shim_constant_assert_50141894102302112148172994662096862652=/tmp/tmpoync5nx4/generated/rust/rust_c_shims/shim_.binstore.c.header.__lisa_c_shim_constant_assert_50141894102302112148172994662096862652 /tmp/tmpoync5nx4/generated/rust/rust.o_objcopy.o /dev/null
 #<!-- -->0 0x00007f823c643716 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd94716)
 #<!-- -->1 0x00007f823c6416d0 llvm::sys::RunSignalHandlers() (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd926d0)
 #<!-- -->2 0x00007f823c643ddb (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd94ddb)
 #<!-- -->3 0x00007f823b49c520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007f823dd5a580 llvm::objcopy::elf::SectionWriter::visit(llvm::objcopy::elf::Section const&amp;) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24ab580)
 #<!-- -->5 0x00007f823dd5b483 llvm::objcopy::elf::Section::accept(llvm::objcopy::elf::SectionVisitor&amp;) const (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24ac483)
 #<!-- -->6 0x00007f823dd751c0 llvm::objcopy::elf::ELFWriter&lt;llvm::object::ELFType&lt;(llvm::endianness)1, true&gt; &gt;::write() (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24c61c0)
 #<!-- -->7 0x00007f823dd563bb (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24a73bb)
 #<!-- -->8 0x00007f823dd56701 llvm::objcopy::elf::executeObjcopyOnBinary(llvm::objcopy::CommonConfig const&amp;, llvm::objcopy::ELFConfig const&amp;, llvm::object::ELFObjectFileBase&amp;, llvm::raw_ostream&amp;) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x24a7701)
 #<!-- -->9 0x00007f823dd494b7 llvm::objcopy::executeObjcopyOnBinary(llvm::objcopy::MultiFormatConfig const&amp;, llvm::object::Binary&amp;, llvm::raw_ostream&amp;) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0x249a4b7)
#<!-- -->10 0x00005631df095f69 (/usr/lib/llvm-18/bin/llvm-objcopy+0x21f69)
#<!-- -->11 0x00007f823c628390 llvm::writeToOutput(llvm::StringRef, std::function&lt;llvm::Error (llvm::raw_ostream&amp;)&gt;) (/lib/x86_64-linux-gnu/libLLVM-18.so.18.1+0xd79390)
#<!-- -->12 0x00005631df0956f3 (/usr/lib/llvm-18/bin/llvm-objcopy+0x216f3)
#<!-- -->13 0x00005631df096006 (/usr/lib/llvm-18/bin/llvm-objcopy+0x22006)
#<!-- -->14 0x00007f823b483d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->15 0x00007f823b483e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->16 0x00005631df07cac5 (/usr/lib/llvm-18/bin/llvm-objcopy+0x8ac5)

[jh7370]

Hi @douglas-raillard-arm, are you able to provide the input object you're seeing this crash with?

[douglas-raillard-arm]

After much hair pulling, it turns out the issue was from my Makefile where a rule was executed multiple times concurrently, leading to objcopy running on partially-written files. Sorry for the noise.