netdev - Re: BUG: unable to handle kernel NULL pointer dereference in fdb_find

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Message-ID: <8791c6f9-e69d-2269-f840-d8e05b0b44da@cumulusnetworks.com>
Date:   Sat, 16 Dec 2017 11:29:09 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Andrei Vagin <avagin@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in
 fdb_find_rcu

On 16/12/17 11:17, Nikolay Aleksandrov wrote:
> On 16/12/17 02:37, Andrei Vagin wrote:
>> Hi,
>>
>> We run criu tests for linux-next and today we get this bug:
>>
>> The kernel version is 4.15.0-rc3-next-20171215
>>
>> [  235.397328] BUG: unable to handle kernel NULL pointer dereference
>> at 000000000000000c
>> [  235.398624] IP: fdb_find_rcu+0x3c/0x130
> [snip]
> 
> Hi,
> Thanks for the report, I've missed the changelink before dev creation case when I did

err, s/changelink/br_stp_change_bridge_id/
the other options are set after register_netdevice, this is the only one changed before

> the rhashtable conversion, some of the options do fdb lookups as part of their routine
> but we don't have the table initialized yet at that point.
> I'll send a fix after some testing.
> 
> Thanks,
>  Nik
> 
>