linux-kernel - Re: [lkp] [x86] 784d5699ed: kmsg.ip_tables:no_symbol_version_for_copy_from

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Message-ID: <57FCE4D9.1090904@suse.cz>
Date:   Tue, 11 Oct 2016 15:10:49 +0200
From:   Michal Marek <mmarek@...e.cz>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [lkp] [x86] 784d5699ed:
 kmsg.ip_tables:no_symbol_version_for_copy_from_user

Dne 30.9.2016 v 01:26 Stephen Rothwell napsal(a):
> Hi all,
> 
> On Tue, 20 Sep 2016 10:55:32 +0800 kernel test robot <xiaolong.ye@...el.com> wrote:
>>
>> FYI, we noticed the following commit:
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>> commit 784d5699eddc55878627da20d3fe0c8542e2f1a2 ("x86: move exports to actual definitions")
>>
>> in testcase: boot
>>
>> on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G
>>
>> caused below changes:
>>
>> [    4.386609] ip_tables: no symbol version for _copy_from_user
>> [    4.387902] ip_tables: Unknown symbol _copy_from_user (err -22)
>> [    4.389219] ip_tables: no symbol version for __put_user_2
>> [    4.390473] ip_tables: Unknown symbol __put_user_2 (err -22)
>> [    4.391760] ip_tables: no symbol version for __sw_hweight32
>> [    4.393031] ip_tables: Unknown symbol __sw_hweight32 (err -22)
>> [    4.394332] ip_tables: no symbol version for memcpy
>> [    4.395508] ip_tables: Unknown symbol memcpy (err -22)
>> [    4.396729] ip_tables: no symbol version for __fentry__
>> [    4.397937] ip_tables: Unknown symbol __fentry__ (err -22)
>> [    4.399234] ip_tables: no symbol version for _copy_to_user
>> [    4.400488] ip_tables: Unknown symbol _copy_to_user (err -22)
>> [    4.405835] systemd[1]: Failed to insert module 'ip_tables': Invalid argument
>>
>>
>>
>> Thanks,
>> Xiaolong
> 
> Do we have any resolution of this?

With which .config is it happening? In my testing, the undefined CRCs
show up as 0x00000000 in Module.symvers and they are also 0 in the
___kcrctab* sections in vmlinux. So the loader matches the requested and
provided symbol's CRC of 0 and is happy. But I guess I'm missing something.

Thanks,
Michal