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

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Date:   Sat, 1 May 2021 08:45:50 +0200
From:   Jiri Slaby <jslaby@...e.com>
To:     Michal Suchánek <msuchanek@...e.de>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Yonghong Song <yhs@...com>, 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, Jiri Olsa <jolsa@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: linux-next failing build due to missing cubictcp_state symbol

On 30. 04. 21, 19:47, Michal Suchánek wrote:
> CC another Jiri
> 
> On Tue, Apr 27, 2021 at 02:12:37PM +0200, Michal Suchánek wrote:
>> On Mon, Apr 26, 2021 at 09:16:36PM +0200, Jiri Olsa wrote:
>>> On Mon, Apr 26, 2021 at 06:03:19PM +0200, Jiri Olsa wrote:
>>>> On Mon, Apr 26, 2021 at 08:41:49AM -0700, Yonghong Song wrote:
>>>>>
>>>>>
>>>>> On 4/26/21 5:14 AM, Michal Suchánek wrote:
>>>>>> On Mon, Apr 26, 2021 at 02:12:20PM +0200, Michal Suchánek wrote:
>>>>>>> On Mon, Apr 26, 2021 at 01:32:15PM +0200, Michal Suchánek wrote:
>>>>>>>> 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
>>>>
>>>> this one was reported by Jesper and was fixed by upgrading pahole
>>>> that contains the new function generation fixes (v1.19)
>>>>
>>>>>>>>>>>
>>>>>>>>>>> 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
>>>>>
>>>>> This is PPC64, from attached config:
>>>>>    CONFIG_PPC64=y
>>>>> I don't have environment to cross-compile for PPC64.
>>>>> Jiri, could you take a look? Thanks!
>>>>
>>>> looks like vfs_truncate did not get into BTF data,
>>>> I'll try to reproduce

_None_ of the functions are generated by pahole -J from debuginfo on 
ppc64. debuginfo appears to be correct. Neither pahole -J fs/open.o 
works correctly. collect_functions in dwarves seems to be defunct on 
ppc64... "functions" array is bogus (so find_function -- the bsearch -- 
fails). I didn't have more time to continue debugging. This is where I 
stopped.

regards,
-- 
js
suse labs