[llvm-bugs] [Bug 27878] New: lld segfault on relocatable link of test/ELF/Inputs/no-augmentation.o

[Rui Ueyama via llvm-bugs]

It crashes because a .MIPS.options input section has no output section.
Simon, do you know what is the best way to handle that type of section for
-r? Should we just copy .MIPS.options to output? What if there are two or
more .MIPS.options input sections from multiple input object files?

On Wed, May 25, 2016 at 8:35 AM, via llvm-bugs <llvm-bugs at lists.llvm.org>
wrote:

> Bug ID 27878 <https://llvm.org/bugs/show_bug.cgi?id=27878>
> Summary lld segfault on relocatable link of
> test/ELF/Inputs/no-augmentation.o
> Product lld
> Version unspecified
> Hardware PC
> OS FreeBSD
> Status NEW
> Severity normal
> Priority P
> Component All Bugs
> Assignee unassignedbugs at nondot.org
> Reporter emaste at freebsd.org
> CC llvm-bugs at lists.llvm.org
> Classification Unclassified
>
> Discovered while creating the test added in r270706.
>
> % build-nodebug/bin/lldb build-debug/bin/ld.lld -- -r
> tools/lld/test/ELF/Inputs/no-augmentation.o
> (lldb) target create "build-debug/bin/ld.lld"
> Current executable set to 'build-debug/bin/ld.lld' (x86_64).
> (lldb) settings set -- target.run-args  "-r"
> "tools/lld/test/ELF/Inputs/no-augmentation.o"
> (lldb) run
> Process 60069 launching
> Process 60069 launched: '/tank/emaste/src/llvm/build-debug/bin/ld.lld' (x86_64)
> Process 60069 stopped
> * thread #1: tid = 101148, 0x0000000000650bb2
> ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
> 1090 at OutputSections.cpp:1332, stop reason = signal SIGSEGV: invalid address
> (fault address: 0x8)
>     frame #0: 0x0000000000650bb2
> ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
> 1090 at OutputSections.cpp:1332
>    1329         ESym->st_value = Body.Value;
>    1330       } else {
>    1331         const OutputSectionBase<ELFT> *OutSec = Section->OutSec;
> -> 1332         ESym->st_shndx = OutSec->SectionIndex;
>    1333         ESym->st_value = OutSec->getVA() + Section->getOffset(Body);
>    1334       }
>    1335       ESym->st_name = P.second;
> (lldb) bt
> * thread #1: tid = 101148, 0x0000000000650bb2
> ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
> 1090 at OutputSections.cpp:1332, stop reason = signal SIGSEGV: invalid address
> (fault address: 0x8)
>   * frame #0: 0x0000000000650bb2
> ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >::writeLocalSymbols(this=0x0000000806858160, Buf=<no value available>) +
> 1090 at OutputSections.cpp:1332
>     frame #1: 0x0000000000650750
> ld.lld`lld::elf::SymbolTableSection<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >::writeTo(this=0x0000000806858160, Buf="") + 96 at
> OutputSections.cpp:1310
>     frame #2: 0x0000000000778a51 ld.lld`(anonymous
> namespace)::Writer<llvm::object::ELFType<(this=0x00007fffffffbfa0)0, true>>::writeSections() + 673 at Writer.cpp:1352
>     frame #3: 0x00000000007725ee ld.lld`(anonymous
> namespace)::Writer<llvm::object::ELFType<(this=0x00007fffffffbfa0)0, true>>::run() + 318 at Writer.cpp:233
>     frame #4: 0x00000000007cd618 ld.lld`void
> lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)0, true>>(Symtab=0x00007fffffffd680)0, true> >*) + 7208 at Writer.cpp:201
>     frame #5: 0x00000000005538b7 ld.lld`void
> lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)0,
> true> >(this=0x00007fffffffe168, Args=0x00007fffffffdc90) + 3175 at
> Driver.cpp:521
>     frame #6: 0x00000000005451ad
> ld.lld`lld::elf::LinkerDriver::main(this=0x00007fffffffe168,
> ArgsArr=ArrayRef<const char *> @ 0x00007fffffffdec8) + 1709 at Driver.cpp:281
>     frame #7: 0x0000000000544a96 ld.lld`lld::elf::link(Args=ArrayRef<const char
> *> @ 0x00007fffffffe3c0, Error=0x00000000048929e8) + 182 at Driver.cpp:49
>     frame #8: 0x0000000000452077 ld.lld`main(Argc=3, Argv=0x00007fffffffe500) +
> 231 at lld.cpp:106
>     frame #9: 0x0000000000451eaf ld.lld`_start(ap=<unavailable>,
> cleanup=<unavailable>) + 367 at crt1.c:78 [opt]
> (lldb)
>
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