crash with --emit-relocs and --strip-debug when debug sections present #44223
Description
| Bugzilla Link | 44878 |
| Resolution | FIXED |
| Resolved on | Apr 15, 2020 23:00 |
| Version | unspecified |
| OS | Linux |
| Blocks | #44654 |
| CC | @MaskRay,@nathanchance,@nickdesaulniers,@rui314,@smithp35,@stephenhines,@tstellar |
| Fixed by commit(s) | 6c73246 489a735 |
Extended Description
Combining --emit-relocs with --strip-debug on an object with debug sections will crash during orphan placement:
$ echo "a;" > test.c
$ clang -g -c -o test.o test.c
...
$ objdump -wh test.o
test.o: file format elf64-x86-64
Sections:
Idx Name Size VMA LMA File off Algn Flags
0 .text 00000000 0000000000000000 0000000000000000 00000040 22 CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .debug_str 00000091 0000000000000000 0000000000000000 00000040 20 CONTENTS, READONLY, DEBUGGING
2 .debug_abbrev 0000002c 0000000000000000 0000000000000000 000000d1 20 CONTENTS, READONLY, DEBUGGING
3 .debug_info 0000003b 0000000000000000 0000000000000000 000000fd 20 CONTENTS, RELOC, READONLY, DEBUGGING
4 .comment 0000006a 0000000000000000 0000000000000000 00000138 20 CONTENTS, READONLY
5 .note.GNU-stack 00000000 0000000000000000 0000000000000000 000001a2 20 CONTENTS, READONLY
6 .debug_line 0000002e 0000000000000000 0000000000000000 000001a2 20 CONTENTS, READONLY, DEBUGGING
7 .llvm_addrsig 00000000 0000000000000000 0000000000000000 00000320 20 CONTENTS, READONLY, EXCLUDE
$ ld.lld --emit-relocs --strip-debug -o /dev/null test.o
Stack dump:
0. Program arguments: ld.lld --emit-relocs --strip-debug -o /dev/null test.o
#0 0x000055a6d904b68e llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/home/kees/src/llvm-build/x86/bin/lld+0x51168e)
#1 0x000055a6d9049514 llvm::sys::RunSignalHandlers() (/home/kees/src/llvm-build/x86/bin/lld+0x50f514)
#2 0x000055a6d9049658 SignalHandler(int) (/home/kees/src/llvm-build/x86/bin/lld+0x50f658)
#3 0x00007fe35d416540 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x15540)
#4 0x000055a6d9028122 llvm::Twine::printOneChild(llvm::raw_ostream&, llvm::Twine::Child, llvm::Twine::NodeKind) const (/home/kees/src/llvm-build/x86/bin/lld+0x4ee122)
#5 0x000055a6d90282a1 llvm::Twine::toVector(llvm::SmallVectorImpl&) const (/home/kees/src/llvm-build/x86/bin/lld+0x4ee2a1)
#6 0x000055a6d902834b llvm::Twine::strabi:cxx11 const (/home/kees/src/llvm-build/x86/bin/lld+0x4ee34b)
#7 0x000055a6d9261a9f lld::elf::getOutputSectionName(lld::elf::InputSectionBase const*) (/home/kees/src/llvm-build/x86/bin/lld+0x727a9f)
#8 0x000055a6d91a8a5e lld::elf::LinkerScript::addOrphanSections()::'lambda'(lld::elf::InputSectionBase*)::operator()(lld::elf::InputSectionBase*) const (/home/kees/src/llvm-build/x86/bin/lld+0x66ea5e)
#9 0x000055a6d91a6177 lld::elf::LinkerScript::addOrphanSections() (/home/kees/src/llvm-build/x86/bin/lld+0x66c177)
#10 0x000055a6d912ce0e void lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1, true> >(llvm::opt::InputArgList&) (/home/kees/src/llvm-build/x86/bin/lld+0x5f2e0e)
#11 0x000055a6d8f7c833 lld::elf::LinkerDriver::main(llvm::ArrayRef<char const*>) (/home/kees/src/llvm-build/x86/bin/lld+0x442833)
#12 0x000055a6d9130dfb lld::elf::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&, llvm::raw_ostream&) (/home/kees/src/llvm-build/x86/bin/lld+0x5f6dfb)
#13 0x000055a6d8f79ede main (/home/kees/src/llvm-build/x86/bin/lld+0x43fede)
#14 0x00007fe35ce921e3 __libc_start_main /build/glibc-4WA41p/glibc-2.30/csu/../csu/libc-start.c:342:3
#15 0x000055a6d900aa4e _start (/home/kees/src/llvm-build/x86/bin/lld+0x4d0a4e)
Segmentation fault (core dumped)