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Date:   Wed, 15 Jan 2020 09:27:35 -0800
From:   Florian Fainelli <>
To:     Norbert Lange <>,
        Richard Cochran <>,
Subject: Re: PROBLEM: kernel crash when unbinding igb device with 4.19.94

On 1/15/20 9:10 AM, Norbert Lange wrote:
> Hello,
> The commit "ptp: fix the race between the release of ptp_clock and
> cdev" (#0393b8720128) introduced a bad regression, atleast in the 4.19
> branch.
> I have a Intel I210 card in the system (actually 4 of them if that's
> relevant), system is a custom buildroot so I dont have all tools to
> create the information, but given that reverting the commit fixed the
> issue I think its narrowed down enough.
> unbinding the driver from one device will always trigger a crash.
> I use the xenomai ipipe-patch on top, if required I could try with a
> naked linux (would cost me some time to do).
> I ran various versions from 4.14 up to 4.19.89, and 4.19.89 with above
> patch reversed, all which did not have this issue.

This patch should fix the problem:

and should soon reach stable kernels if it has not already.

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