linux-kernel - Re: kallsyms failure: relative symbol value 0xffffffff810002a0 out of range in relative mode

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Date:	Thu, 17 Mar 2016 12:01:19 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Kees Cook <keescook@...omium.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michal Marek <mmarek@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: kallsyms failure: relative symbol value 0xffffffff810002a0 out of
 range in relative mode

On 17 March 2016 at 08:14, Markus Trippelsdorf <markus@...ppelsdorf.de> wrote:
> On 2016.03.17 at 08:03 +0100, Ard Biesheuvel wrote:
>> On 16 March 2016 at 22:25, Markus Trippelsdorf <markus@...ppelsdorf.de> wrote:
>> > Since:
>> > commit 2213e9a66bb87d8344a1256b4ef568220d9587fb
>> > Author: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> > Date:   Tue Mar 15 14:58:19 2016 -0700
>> >
>> >     kallsyms: add support for relative offsets in kallsyms address table
>> >
>> > kernels linked with ld.gold are broken:
>> >
>>
>> Could you elaborate? I tried building x86_64_defconfig with
>> -fuse-ld=gold added to LDFLAGS, and it builds fine.
>>
>> Could you share your config, please? And instructions how to invoke
>> the gold linker?
>
> I'm using gold trunk and ld.gold is my system linker (just a hard link
> to ld). My config is attached.
>
> (For testing I use the following qemu command:
>  qemu-system-x86_64 -s -enable-kvm -net nic,vlan=0,model=virtio -net user -fsdev local,security_model=none,id=root,path=/ -device virtio-9p-pci,id=root,fsdev=root,mount_tag=/dev/root -m 512 -smp 2 -kernel /usr/src/linux/arch/x86/boot/bzImage -nographic -append "init=/bin/zsh root=/dev/root console=ttyS0 kgdboc=ttyS0 rootflags=rw,trans=virtio rootfstype=9p ip=dhcp earlyprintk=ttyS0" )
>
>> >   KSYM    .tmp_kallsyms1.o
>> > kallsyms failure: relative symbol value 0xffffffff810002a0 out of range in relative mode
>> >   KSYM    .tmp_kallsyms2.o
>> > kallsyms failure: relative symbol value 0xffffffff810002a0 out of range in relative mode
>> >   LD      vmlinux
>> >
>> > They die early during boot:
>> >
>>
>> Note that there is a patch queued in the kbuild tree to at least abort
>> the build if such failures happens.
>
> Yes. That would be much better.
>

I tried building with your config, and I still cannot reproduce. I
using my system's GCC + GOLD:

gold -v
GNU gold (GNU Binutils for Ubuntu 2.25.1) 1.11

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
5.2.1-22ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++
--prefix=/usr --program-suffix=-5 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --libdir=/usr/lib
--enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo
--with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre
--enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64
--with-arch-directory=amd64
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)

Can you reproduce it with a release version of GOLD?