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

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Message-ID: <415b4093-4c58-c671-0df1-a6f650414416@cumulusnetworks.com>
Date:   Sat, 16 Dec 2017 11:17:17 +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 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
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