[llvm-bugs] [Bug 36991] New: LLD-linked binary segfaults at runtime on alpine linux

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36991

            Bug ID: 36991
           Summary: LLD-linked binary segfaults at runtime on alpine linux
           Product: lld
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: superjoe30 at gmail.com
                CC: llvm-bugs at lists.llvm.org

Alpine linux is a distribution that uses musl libc instead glibc. Here are my
steps to reproduce:

On Alpine linux, download LLVM, Clang, LLD 6.0.0 from releases.llvm.org, and
build them from source.

$ clang -c hello_world.c
$ ld.lld  --gc-sections -m elf_x86_64 -o hello_world
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
/lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
$ ./hello_world
Segmentation fault (core dumped)

Now try with binutils:
$ ld  --gc-sections -m elf_x86_64 -o hello_world
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
/lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
$ ./hello_world
Hello, World!


I also have a repro.tar.xz: https://superjoe.s3.amazonaws.com/temp/repro.tar.xz

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