linux-kernel - Re: linux-next failing build due to missing cubictcp

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Date:   Mon, 26 Apr 2021 13:32:15 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Yonghong Song <yhs@...com>
Cc:     linux-kernel@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: linux-next failing build due to missing cubictcp_state symbol

On Sun, Apr 25, 2021 at 01:15:45PM +0200, Michal Suchánek wrote:
> On Fri, Apr 23, 2021 at 07:55:28PM +0200, Michal Suchánek wrote:
> > On Fri, Apr 23, 2021 at 07:41:29AM -0700, Yonghong Song wrote:
> > > 
> > > 
> > > On 4/23/21 6:05 AM, Michal Suchánek wrote:
> > > > Hello,
> > > > 
> > > > I see this build error in linux-next (config attached).
> > > > 
> > > > [ 4939s]   LD      vmlinux
> > > > [ 4959s]   BTFIDS  vmlinux
> > > > [ 4959s] FAILED unresolved symbol cubictcp_state
> > > > [ 4960s] make[1]: ***
> > > > [/home/abuild/rpmbuild/BUILD/kernel-vanilla-5.12~rc8.next.20210422/linux-5.12-rc8-next-20210422/Makefile:1277:
> > > > vmlinux] Error 255
> > > > [ 4960s] make: *** [../Makefile:222: __sub-make] Error 2
> > > 
> > > Looks like you have DYNAMIC_FTRACE config option enabled already.
> > > Could you try a later version of pahole?
> > 
> > Is this requireent new?
> > 
> > I have pahole 1.20, and master does build without problems.
> > 
> > If newer version is needed can a check be added?
> 
> With dwarves 1.21 some architectures are fixed and some report other
> missing symbol. Definitely an improvenent.
> 
> I see some new type support was added so it makes sense if that type is
> used the new dwarves are needed.

Ok, here is the current failure with dwarves 1.21 on 5.12:

[ 2548s]   LD      vmlinux
[ 2557s]   BTFIDS  vmlinux
[ 2557s] FAILED unresolved symbol vfs_truncate
[ 2558s] make[1]: ***
[/home/abuild/rpmbuild/BUILD/kernel-kvmsmall-5.12.0/linux-5.12/Makefile:1213:
vmlinux] Error 255

Any idea where this one is coming from?

Thanks

Michal

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