linux-kernel - Re: BUG warnings in 4.14.9

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Message-ID: <20171227042459.cm7hgti47rkmwf3d@sasha-lappy>
Date:   Wed, 27 Dec 2017 04:25:00 +0000
From:   alexander.levin@...izon.com
To:     Ido Schimmel <idosch@...sch.org>
CC:     Willy Tarreau <w@....eu>, Wei Wang <weiwan@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Chris Rankin" <rankincj@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG warnings in 4.14.9

On Tue, Dec 26, 2017 at 10:54:37PM +0200, Ido Schimmel wrote:
>On Tue, Dec 26, 2017 at 07:59:55PM +0100, Willy Tarreau wrote:
>> Guys,
>>
>> Chris reported the bug below and confirmed that reverting commit
>> 9704f81 (ipv6: grab rt->rt6i_ref before allocating pcpu rt) seems to
>> have fixed the issue for him. This patch is a94b9367 in mainline.
>>
>> I personally have no opinion on the patch, just found it because it
>> was the only one touching this area between 4.14.8 and 4.14.9 :-)
>>
>> Should this be reverted or maybe fixed differently ?
>
>Maybe I'm missing something, but how come this patch even made its way
>into 4.14.y? It's part of a series to RCU-ify IPv6 FIB lookup that went
>into 4.15.
>
>Anyway, the mentioned bug was already fixed by commit 951f788a80ff
>("ipv6: fix a BUG in rt6_get_pcpu_route()") when the code was still in
>net-next.

Uh, you're right. Greg, please just revert 9704f81. Thanks!

-- 

Thanks,
Sasha