[llvm-dev] AArch64 tests failing
David Greene via llvm-dev
llvm-dev at lists.llvm.org
Tue Mar 19 19:01:39 PDT 2019
I seems to be a gcc miscompile. We've seen other tests fail with gcc
6.1.0 (which we've been using) and those other failures and the ones I
just reported go away with gcc 8.2.0.
Now, it's theoretically possible that gcc 8.2.0 is just optimizing
differently and not behaving the same way with some undefined behavior
in the LLVM sources, but that seems less likely than a gcc bug, given
that the many other compilers people use (not just gcc) aren't
triggering any problems.
Perhaps we should note that gcc 6.1.0 may be buggy when building on
AArch64 here:
http://llvm.org/docs/GettingStarted.html#host-c-toolchain-both-compiler-and-standard-library
I'm happy to make that change, but I unfortunately don't have time to
verify *for sure* that gcc 6.1.0 is buggy. It's just a theory at the
moment. Is it premature to add a note about gcc 6.1.0 on that page?
-David
Jordan Rupprecht <rupprecht at google.com> writes:
> I only have an x86 to test with, so no. Are you able to get more information, perhaps running in debug mode to get line numbers?
>
> On Tue, Mar 19, 2019 at 8:06 AM David Greene via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> I'm seeing a bunch of failures on AArch64 after updating this morning.
> These are NOT failing on x86-64. These all seem to be caused by
> segfaults (example backtrace below). Is anyone else seeing this?
>
> -David
>
> LLVM :: DebugInfo/symbolize-no-debug-str.test
> LLVM :: tools/gold/X86/comdat.ll
> LLVM :: tools/gold/X86/visibility.ll
> LLVM :: tools/llvm-objcopy/ELF/add-section-remove.test
> LLVM :: tools/llvm-objcopy/ELF/add-section.test
> LLVM :: tools/llvm-objcopy/ELF/armexidx-link.test
> LLVM :: tools/llvm-objcopy/ELF/auto-remove-shndx.test
> LLVM :: tools/llvm-objcopy/ELF/binary-first-seg-offset-zero.test
> LLVM :: tools/llvm-objcopy/ELF/binary-output-empty.test
> LLVM :: tools/llvm-objcopy/ELF/binary-remove-all-but-one.test
> LLVM :: tools/llvm-objcopy/ELF/binary-remove-end.test
> LLVM :: tools/llvm-objcopy/ELF/binary-remove-middle.test
> LLVM :: tools/llvm-objcopy/ELF/dynsym-error-remove-strtab.test
> LLVM :: tools/llvm-objcopy/ELF/explicit-keep-remove.test
> LLVM :: tools/llvm-objcopy/ELF/explicit-only-section-remove.test
> LLVM :: tools/llvm-objcopy/ELF/group-big-endian.test
> LLVM :: tools/llvm-objcopy/ELF/group-unchanged.test
> LLVM :: tools/llvm-objcopy/ELF/group.test
> LLVM :: tools/llvm-objcopy/ELF/keep-symbol-remove-section.test
> LLVM :: tools/llvm-objcopy/ELF/only-section-remove-strtab.test
> LLVM :: tools/llvm-objcopy/ELF/parent-loop-check.test
> LLVM :: tools/llvm-objcopy/ELF/reloc-error-remove-symtab.test
> LLVM :: tools/llvm-objcopy/ELF/remove-multiple-sections.test
> LLVM :: tools/llvm-objcopy/ELF/remove-section-in-segment.test
> LLVM :: tools/llvm-objcopy/ELF/remove-section-with-symbol.test
> LLVM :: tools/llvm-objcopy/ELF/remove-section.test
> LLVM :: tools/llvm-objcopy/ELF/remove-shndx.test
> LLVM :: tools/llvm-objcopy/ELF/remove-shstrtab-error.test
> LLVM :: tools/llvm-objcopy/ELF/remove-symtab.test
> LLVM :: tools/llvm-objcopy/ELF/segment-shift-section-remove.test
> LLVM :: tools/llvm-objcopy/ELF/segment-test-remove-section.test
> LLVM :: tools/llvm-objcopy/ELF/strict-no-add.test
> LLVM :: tools/llvm-objcopy/ELF/strip-all-and-remove.test
> LLVM :: tools/llvm-objcopy/ELF/strip-debug-and-remove.test
> LLVM :: tools/llvm-objcopy/ELF/strip-section-err.test
> LLVM :: tools/llvm-objcopy/ELF/symtab-error-on-remove-strtab.test
> LLVM :: tools/llvm-objcopy/ELF/two-seg-remove-end.test
> LLVM :: tools/llvm-objcopy/ELF/two-seg-remove-first.test
> LLVM :: tools/llvm-objcopy/ELF/two-seg-remove-third-sec.test
> LLVM :: tools/llvm-readobj/elf-no-relocs.test
>
> ---------------------------------------------------
>
> Lots of segfaults like this:
>
> Stack dump:
> 0. Program arguments: /clang/build/aarch64/bin/llvm-objcopy -R .text -R s0 -R s1 -R s2 -R s3 -R s4 -R s5 -R s6 /clang/build/aarch64/test/tools/llvm-objcopy/ELF/Output/strict-no-add.test.tmp.0
> /clang/build/aarch64/test/tools/llvm-objcopy/ELF/Output/strict-no-add.test.tmp2
> #0 0x0000ffff9ebbb498 llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/clang/build/aarch64/bin/../lib/libLLVMSupport.so.9svn+0x177498)
> #1 0x0000ffff9ebb93e8 llvm::sys::RunSignalHandlers() (/clang/build/aarch64/bin/../lib/libLLVMSupport.so.9svn+0x1753e8)
> #2 0x0000ffff9ebb9540 SignalHandler(int) (/clang/build/aarch64/bin/../lib/libLLVMSupport.so.9svn+0x175540)
> #3 0x0000ffff9edac6c0 (linux-vdso.so.1+0x6c0)
> #4 0x000000000042a098 std::_Function_handler<bool (llvm::objcopy::elf::SectionBase const&), llvm::objcopy::elf::handleArgs(llvm::objcopy::CopyConfig const&, llvm::objcopy::elf::Object&, llvm::objcopy::elf::Reader const&,
> llvm::objcopy::elf::ElfType)::'lambda2'(llvm::objcopy::elf::SectionBase const&)>::_M_invoke(std::_Any_data const&, llvm::objcopy::elf::SectionBase const&) (/clang/build/aarch64/bin/llvm-objcopy+0x42a098)
> #5 0x0000000000432ca8 llvm::objcopy::elf::Object::removeSections(std::function<bool (llvm::objcopy::elf::SectionBase const&)>)::'lambda'(std::unique_ptr<llvm::objcopy::elf::SectionBase, std::default_delete<llvm::objcopy::elf::SectionBase> >
> const&)::operator()(std::unique_ptr<llvm::objcopy::elf::SectionBase, std::default_delete<llvm::objcopy::elf::SectionBase> > const&) const (/clang/build/aarch64/bin/llvm-objcopy+0x432ca8)
> #6 0x0000000000446514 llvm::objcopy::elf::Object::removeSections(std::function<bool (llvm::objcopy::elf::SectionBase const&)>) (/clang/build/aarch64/bin/llvm-objcopy+0x446514)
> #7 0x000000000042c660 llvm::objcopy::elf::handleArgs(llvm::objcopy::CopyConfig const&, llvm::objcopy::elf::Object&, llvm::objcopy::elf::Reader const&, llvm::objcopy::elf::ElfType) (/clang/build/aarch64/bin/llvm-objcopy+0x42c660)
> #8 0x000000000042e270 llvm::objcopy::elf::executeObjcopyOnBinary(llvm::objcopy::CopyConfig const&, llvm::object::ELFObjectFileBase&, llvm::objcopy::Buffer&) (/clang/build/aarch64/bin/llvm-objcopy+0x42e270)
> #9 0x000000000041699c executeObjcopyOnBinary(llvm::objcopy::CopyConfig const&, llvm::object::Binary&, llvm::objcopy::Buffer&) (/clang/build/aarch64/bin/llvm-objcopy+0x41699c)
> #10 0x000000000040a42c main (/clang/build/aarch64/bin/llvm-objcopy+0x40a42c)
> #11 0x0000ffff9e4fdae4 __libc_start_main (/lib64/libc.so.6+0x1fae4)
> #12 0x000000000040a9e8 _start /home/abuild/rpmbuild/BUILD/glibc-2.26/csu/../sysdeps/aarch64/start.S:86:0
> /clang/build/aarch64/test/tools/llvm-objcopy/ELF/Output/strict-no-add.test.script: line 5: 64367 Segmentation fault (core dumped) /clang/build/aarch64/bin/llvm-objcopy -R .text -R s0 -R s1 -R s2 -R s3 -R s4 -R s5 -R s6
> /clang/build/aarch64/test/tools/llvm-objcopy/ELF/Output/strict-no-add.test.tmp.0 /clang/build/aarch64/test/tools/llvm-objcopy/ELF/Output/strict-no-add.test.tmp2
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