[llvm-dev] llvm bug 36466 fix

Sat Nov 3 11:57:59 PDT 2018

On Sat, Nov 3, 2018 at 6:51 AM Muhui Jiang via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi
>
> I come across the following exception when I use the llvm-dwarfdump
> -debug-info target_binary:
>
> llvm-dwarfdump: /home/linux/llvm-7/llvm/lib/MC/MCRegisterInfo.cpp:87: int
> llvm::MCRegisterInfo::getLLVMRegNum(unsigned int, bool) const: Assertion `I
> != M+Size && I->FromReg == RegNum && "Invalid RegNum"' failed.
> Stack dump:
> 0.      Program arguments:
> /home/linux/llvm-7/llvm/build/bin/llvm-dwarfdump -debug-info
> C++/483.xalancbmk.O1
> #0 0x000000000093ab37 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
> /home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:490:0
> #1 0x000000000093abca PrintStackTraceSignalHandler(void*)
> /home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:554:0
> #2 0x00000000009388d8 llvm::sys::RunSignalHandlers()
> /home/linux/llvm-7/llvm/lib/Support/Signals.cpp:67:0
> #3 0x000000000093a531 SignalHandler(int)
> /home/linux/llvm-7/llvm/lib/Support/Unix/Signals.inc:353:0
> #4 0x00007f39f47d7390 __restore_rt
> (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
> #5 0x00007f39f374d428 gsignal
> /build/glibc-Cl5G7W/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
> #6 0x00007f39f374f02a abort
> /build/glibc-Cl5G7W/glibc-2.23/stdlib/abort.c:91:0
> #7 0x00007f39f3745bd7 __assert_fail_base
> /build/glibc-Cl5G7W/glibc-2.23/assert/assert.c:92:0
> #8 0x00007f39f3745c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
> #9 0x00000000006e6ba1 llvm::MCRegisterInfo::getLLVMRegNum(unsigned int,
> bool) const /home/linux/llvm-7/llvm/lib/MC/MCRegisterInfo.cpp:88:0
> #10 0x00000000004bd03e llvm::prettyPrintRegisterOp(llvm::raw_ostream&,
> unsigned char, unsigned long*, llvm::MCRegisterInfo const*, bool)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:206:0
> #11 0x00000000004bd226
> llvm::DWARFExpression::Operation::print(llvm::raw_ostream&,
> llvm::DWARFExpression const*, llvm::MCRegisterInfo const*, bool)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:237:0
> #12 0x00000000004bd466 llvm::DWARFExpression::print(llvm::raw_ostream&,
> llvm::MCRegisterInfo const*, bool) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFExpression.cpp:264:0
> #13 0x00000000004a8c68 dumpExpression(llvm::raw_ostream&,
> llvm::ArrayRef<char>, bool, unsigned int, llvm::MCRegisterInfo const*)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDebugLoc.cpp:38:0
> #14 0x00000000004a8ea5
> llvm::DWARFDebugLoc::LocationList::dump(llvm::raw_ostream&, bool, unsigned
> int, llvm::MCRegisterInfo const*, unsigned long, unsigned int) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDebugLoc.cpp:45:0
> #15 0x00000000004b331d dumpLocation(llvm::raw_ostream&,
> llvm::DWARFFormValue&, llvm::DWARFUnit*, unsigned int, llvm::DIDumpOptions)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:115:0
> #16 0x00000000004b4034 dumpAttribute(llvm::raw_ostream&, llvm::DWARFDie
> const&, unsigned int*, llvm::dwarf::Attribute, llvm::dwarf::Form, unsigned
> int, llvm::DIDumpOptions)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:243:0
> #17 0x00000000004b5cd2 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
> int, llvm::DIDumpOptions) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:521:0
> #18 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
> int, llvm::DIDumpOptions) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
> #19 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
> int, llvm::DIDumpOptions) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
> #20 0x00000000004b5db4 llvm::DWARFDie::dump(llvm::raw_ostream&, unsigned
> int, llvm::DIDumpOptions) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFDie.cpp:530:0
> #21 0x0000000000445cdd llvm::DWARFCompileUnit::dump(llvm::raw_ostream&,
> llvm::DIDumpOptions)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFCompileUnit.cpp:31:0
> #22 0x00000000004482ad llvm::DWARFContext::dump(llvm::raw_ostream&,
> llvm::DIDumpOptions, std::array<llvm::Optional<unsigned long>,
> 27ul>)::'lambda0'(bool, char const*, llvm::DWARFSection,
> llvm::iterator_range<std::unique_ptr<llvm::DWARFCompileUnit,
> std::default_delete<llvm::DWARFCompileUnit> >*>)::operator()(bool, char
> const*, llvm::DWARFSection,
> llvm::iterator_range<std::unique_ptr<llvm::DWARFCompileUnit,
> std::default_delete<llvm::DWARFCompileUnit> >*>) const
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp:351:0
> #23 0x0000000000448e28 llvm::DWARFContext::dump(llvm::raw_ostream&,
> llvm::DIDumpOptions, std::array<llvm::Optional<unsigned long>, 27ul>)
> /home/linux/llvm-7/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp:355:0
> #24 0x0000000000414af6 dumpObjectFile(llvm::object::ObjectFile&,
> llvm::DWARFContext&, llvm::Twine, llvm::raw_ostream&)
> /home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:424:0
> #25 0x0000000000425d9a std::_Function_handler<bool
> (llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine,
> llvm::raw_ostream&), bool (*)(llvm::object::ObjectFile&,
> llvm::DWARFContext&, llvm::Twine,
> llvm::raw_ostream&)>::_M_invoke(std::_Any_data const&,
> llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine&&,
> llvm::raw_ostream&) /usr/include/c++/5/functional:1857:0
> #26 0x0000000000420f69 std::function<bool (llvm::object::ObjectFile&,
> llvm::DWARFContext&, llvm::Twine,
> llvm::raw_ostream&)>::operator()(llvm::object::ObjectFile&,
> llvm::DWARFContext&, llvm::Twine, llvm::raw_ostream&) const
> /usr/include/c++/5/functional:2268:0
> #27 0x0000000000415377 handleBuffer(llvm::StringRef,
> llvm::MemoryBufferRef, std::function<bool (llvm::object::ObjectFile&,
> llvm::DWARFContext&, llvm::Twine, llvm::raw_ostream&)>, llvm::raw_ostream&)
> /home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:472:0
> #28 0x0000000000415ae2 handleFile(llvm::StringRef, std::function<bool
> (llvm::object::ObjectFile&, llvm::DWARFContext&, llvm::Twine,
> llvm::raw_ostream&)>, llvm::raw_ostream&)
> /home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:506:0
> #29 0x00000000004170a4 main
> /home/linux/llvm-7/llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp:623:0
> #30 0x00007f39f3738830 __libc_start_main
> /build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:325:0
> #31 0x00000000004092e9 _start
> (/home/linux/llvm-7/llvm/build/bin/llvm-dwarfdump+0x4092e9)
> Aborted (core dumped)
>
>
> After the google search. It seems that it should be an bug here
> https://www.mail-archive.com/llvm-bugs@lists.llvm.org/msg21648.html
>
> I am using llvm 7.0 and cross compiled the binary with linaro arm
> toolchain(7.3.1). It takes me quiet a long time to compile and analysis the
> bitcode. Are there any solutions on fixing this without re-compiling the
> binary. Many Thanks
>

Not much you can do to fix the bug if you can't readily recompile and rerun
the tests - what sort of hardware do you have access to? (you might be able
to reproduce this without ARM if your ARM machine has few cores/not much
RAM but you have something else (X86 desktop machine) with more of both)

If you can't do that but would like to help move the bug forward anyway, a
useful thing to do might be to try to find a reduced/small test case that
demonstrates the issue to make it easier for someone else to investigate
and fix the issue.

- Dave

>
> Regards
> Muhui
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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