netdev - Re: 4.4.103 linux kernel regression

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Message-ID: <20171223135249.GA16617@kroah.com>
Date:   Sat, 23 Dec 2017 14:52:49 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mathias Tillman <master.homer@...il.com>
Cc:     netdev@...r.kernel.org, stable@...r.kernel.org,
        xiyou.wangcong@...il.com, dsahern@...il.com,
        jeffy.chen@...k-chips.com, davem@...emloft.net,
        khlebnikov@...dex-team.ru
Subject: Re: 4.4.103 linux kernel regression

adding stable@ and netdev@

On Sat, Dec 23, 2017 at 10:49:27AM +0000, Mathias Tillman wrote:
> Hi, I wanted to make you aware of a recent regression to the Linux kernel
> introduced with commit 2417da3f4d6bc4fc6c77f613f0e2264090892aa5:
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/net/ipv6?h=linux-4.4.y&id=2417da3f4d6bc4fc6c77f613f0e2264090892aa5

Is this issue also present in Linus's tree?

> I have reported it here:
> https://bugzilla.kernel.org/show_bug.cgi?id=198189

Bugzilla doesn't work for networking bugs, nor stable stuff, just for a
few subsystems, sorry.

> Basically, that commit causes an endless loop if, for some reason, not all
> devices are unregistered in the rollback_registered_many function in
> net/dev.c
> 
> Decided to contact you directly since I have yet to receive any reply on
> the bug report, and I wasn't entirely sure what the procedure was. Please
> do let me know if I have to change anything in the report.

I can revert it, but it would be good to verify if this is an issue in
the latest releases or not first.

thanks,

greg k-h