linux-kernel - Re: BTFIDS: FAILED unresolved symbol udp6

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Message-ID: <20201230150431.GA587975@krava>
Date:   Wed, 30 Dec 2020 16:04:31 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Qais Yousef <qais.yousef@....com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: BTFIDS: FAILED unresolved symbol udp6_sock

On Wed, Dec 30, 2020 at 11:19:36AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 30, 2020 at 02:28:52PM +0100, Jiri Olsa escreveu:
> > On Wed, Dec 30, 2020 at 02:28:02PM +0100, Jiri Olsa wrote:
> > > On Wed, Dec 30, 2020 at 10:03:37AM +0100, Jiri Olsa wrote:
> > > > On Tue, Dec 29, 2020 at 11:28:35PM +0000, Qais Yousef wrote:
> > > > > Hi Jiri
> > > > > 
> > > > > On 12/29/20 18:34, Jiri Olsa wrote:
> > > > > > On Tue, Dec 29, 2020 at 03:13:52PM +0000, Qais Yousef wrote:
> > > > > > > Hi
> > > > > > > 
> > > > > > > When I enable CONFIG_DEBUG_INFO_BTF I get the following error in the BTFIDS
> > > > > > > stage
> > > > > > > 
> > > > > > > 	FAILED unresolved symbol udp6_sock
> > > > > > > 
> > > > > > > I cross compile for arm64. My .config is attached.
> > > > > > > 
> > > > > > > I managed to reproduce the problem on v5.9 and v5.10. Plus 5.11-rc1.
> > > > > > > 
> > > > > > > Have you seen this before? I couldn't find a specific report about this
> > > > > > > problem.
> > > > > > > 
> > > > > > > Let me know if you need more info.
> > > > > > 
> > > > > > hi,
> > > > > > this looks like symptom of the gcc DWARF bug we were
> > > > > > dealing with recently:
> > > > > > 
> > > > > >   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97060
> > > > > >   https://lore.kernel.org/lkml/CAE1WUT75gu9G62Q9uAALGN6vLX=o7vZ9uhqtVWnbUV81DgmFPw@mail.gmail.com/#r
> > > > > > 
> > > > > > what pahole/gcc version are you using?
> > > > > 
> > > > > I'm on gcc 9.3.0
> > > > > 
> > > > > 	aarch64-linux-gnu-gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
> > > > > 
> > > > > I was on pahole v1.17. I moved to v1.19 but I still see the same problem.
> 
> There are some changes post v1.19 in the git repo:
> 
> [acme@...e pahole]$ git log --oneline v1.19..
> b688e35970600c15 (HEAD -> master) btf_encoder: fix skipping per-CPU variables at offset 0
> 8c009d6ce762dfc9 btf_encoder: fix BTF variable generation for kernel modules
> b94e97e015a94e6b dwarves: Fix compilation on 32-bit architectures
> 17df51c700248f02 btf_encoder: Detect kernel module ftrace addresses
> 06ca639505fc56c6 btf_encoder: Use address size based on ELF's class
> aff60970d16b909e btf_encoder: Factor filter_functions function
> 1e6a3fed6e52d365 (quaco/master) rpm: Fix changelog date
> [acme@...e pahole]$
> 
> But I think these won't matter in this case :-\

yep, it did not.. I used the latest dwarves code

jirka