netdev - Re: [PATCH 4.4 106/124] netlink: Do not subscribe to non-existent groups

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Message-ID: <1533422007.2679.141.camel@arista.com>
Date:   Sat, 04 Aug 2018 23:33:27 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH 4.4 106/124] netlink: Do not subscribe to non-existent
 groups

On Sat, 2018-08-04 at 11:07 -0700, Nathan Chancellor wrote:
> Hi Greg,

Hi Nathan,

> I am so sorry I didn't catch this in my initial report but this
> commit
> along with ba7aaf93ef2f ("netlink: Don't shift with UB on nlk-
> >ngroups")
> breaks mobile data on both the Pixel 2 XL and OnePlus 6. There is
> signal
> but it just never connects to 3G/LTE. Reverting those two commits
> fixes
> the issue.

Sorry for breaking your use-case,

> Nothing stands out to me in dmesg unfortunately and iven neither
> device
> is running a vanilla kernel, I cannot say if this is a problem in
> mainline
> or not but I just wanted to make you aware of it.

Could you provide the dmesg output for the attached debug diff?

-- 
Thanks,
             Dmitry
View attachment "netlink_groups.diff" of type "text/x-patch" (598 bytes)