linux-kernel - Re: compile error due to relocation problems in tools/bpf/resolve

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Date:   Wed, 8 Feb 2023 13:19:38 +0100
From:   Thorsten Leemhuis <linux@...mhuis.info>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Ian Rogers <irogers@...gle.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: compile error due to relocation problems in
 tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o)

On 08.02.23 10:24, Jiri Olsa wrote:
> On Wed, Feb 08, 2023 at 09:18:31AM +0100, Thorsten Leemhuis wrote:
>> Hi! My daily linux-next builds for Fedora 36, 37 and 38 failed due to a
>> compile error today. I lack time to investigate this properly currently
>> (sorry!), but wanted to report it at least briefly nevertheless.
>>
>> See below for the error log. I noticed there where changes from Jiri
>> ("tools/resolve_btfids: Compile resolve_btfids as host program") and Ian
>> ("tools/resolve_btfids: Tidy HOST_OVERRIDES") merged yesterday that
>> touch the code in question, which made me wonder if they cause this. But
>> maybe my spec file (it's based on the one from Fedora rawhide's kernel)
>> is doing something it shouldn't do.
>>
>> Here are the build errors:
>>
>> On x86_64:
>>
>>> + /usr/bin/make -s 'HOSTCFLAGS=-O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer' 'HOSTLDFLAGS=-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 -specs=/usr/lib/rpm/redhat/redhat-package-notes' ARCH=x86_64 'KCFLAGS= ' WITH_GCOV=0 -j2 bzImage
>>> /usr/bin/ld: /builddir/build/BUILD/kernel-next-20230208/linux-6.2.0-0.0.next.20230208.350.vanilla.fc38.x86_64/tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE object; recompile with -fPIE
>>> /usr/bin/ld: failed to set dynamic section sizes: bad value
>>> collect2: error: ld returned 1 exit status
>>> make[2]: *** [Makefile:87: /builddir/build/BUILD/kernel-next-20230208/linux-6.2.0-0.0.next.20230208.350.vanilla.fc38.x86_64/tools/bpf/resolve_btfids//resolve_btfids] Error 1
>>> make[1]: *** [Makefile:76: bpf/resolve_btfids] Error 2
>>> make: *** [Makefile:1438: tools/bpf/resolve_btfids] Error 2
>>> make: *** Waiting for unfinished jobs....
>>
>> On arm64:
>>
>>> + /usr/bin/make -s 'HOSTCFLAGS=-O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer' 'HOSTLDFLAGS=-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 -specs=/usr/lib/rpm/redhat/redhat-package-notes' ARCH=arm64 'KCFLAGS= ' WITH_GCOV=0 -j4 Image.gz
>>> /usr/bin/ld: /builddir/build/BUILD/kernel-next-20230208/linux-6.2.0-0.0.next.20230208.350.vanilla.fc38.aarch64/tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o): relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `stderr@@GLIBC_2.17' which may bind externally can not be used when making a shared object; recompile with -fPIC
>>> /usr/bin/ld: /builddir/build/BUILD/kernel-next-20230208/linux-6.2.0-0.0.next.20230208.350.vanilla.fc38.aarch64/tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o)(.text+0x21c): unresolvable R_AARCH64_ADR_PREL_PG_HI21 relocation against symbol `stderr@@GLIBC_2.17'
>>> /usr/bin/ld: final link failed: bad value
>>> collect2: error: ld returned 1 exit status
>>> make[2]: *** [Makefile:87: /builddir/build/BUILD/kernel-next-20230208/linux-6.2.0-0.0.next.20230208.350.vanilla.fc38.aarch64/tools/bpf/resolve_btfids//resolve_btfids] Error 1
>>> make[1]: *** [Makefile:76: bpf/resolve_btfids] Error 2
>>> make: *** [Makefile:1439: tools/bpf/resolve_btfids] Error 2
>>> make: *** Waiting for unfinished jobs....
>>
>> For complete logs click on the "builder-live.log" links on
>> https://copr.fedorainfracloud.org/coprs/g/kernel-vanilla/next/build/5502791/
>>
>>
>> Yesterdays logs can be found here:
>> https://copr.fedorainfracloud.org/coprs/g/kernel-vanilla/next/build/5495974/
>>
>> Ciao, Thorsten
> 
> ciao ;-)
> 
> I managed to reproduce and patch below fixes the issue for me,
> could you please test?

Yeah, that fixes is. Feel free to add a:

Tested-by: Thorsten Leemhuis <linux@...mhuis.info>

> I have in stack several other fixes for this, would be great
> if you could test them, I'll cc you 

Yeah, no problem.

Ciao, Thorsten

> ---
> diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile
> index 2abdd85b4a08..ac548a7baa73 100644
> --- a/tools/bpf/resolve_btfids/Makefile
> +++ b/tools/bpf/resolve_btfids/Makefile
> @@ -19,7 +19,7 @@ endif
>  
>  # Overrides for the prepare step libraries.
>  HOST_OVERRIDES := AR="$(HOSTAR)" CC="$(HOSTCC)" LD="$(HOSTLD)" ARCH="$(HOSTARCH)" \
> -		  CROSS_COMPILE=""
> +		  CROSS_COMPILE="" EXTRA_CFLAGS="$(HOSTCFLAGS)"
>  
>  RM      ?= rm
>  HOSTCC  ?= gcc
>