linux-kernel - Re: i.MX6: Oops when unplugging a USB key

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Date:	Fri, 6 Nov 2015 20:28:45 +0100
From:	Jean-Michel Hautbois <jean-michel.hautbois@...-labs.com>
To:	Joshua Clayton <joshua.clayton@...west.com>
Cc:	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Jon Nettleton <jon.nettleton@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: i.MX6: Oops when unplugging a USB key

2015-11-06 20:12 GMT+01:00 Joshua Clayton <joshua.clayton@...west.com>:
> On Friday, November 06, 2015 05:32:30 PM Jean-Michel Hautbois wrote:
>> Hi !
>>
>> I have an issue on my i.MX6 board I don't understand (kernel is a 4.2)...
>> When I connect a USB key, and then disconnect it, it oopses and
>> reboots (as I have panic on oops, and reboot on panic).
>> Seems to be on the umount part...
>> The USB is connected through a smsc95xx but I don't think this is related...
>>
>> Any idea is welcome :)
>>
>
> I have seen a similar issue intermitently on my imx6 based board.
> I would also like to find a fix.
>
> Specifically: unplugging usb storage occasionally causes an oops.
>
> I'm guessing a race with use-after-free, but I haven't tracked it down.
> In my environment it has been hard to reproduce, and I wasn't able to
> grok anything useful in the trace.
>
> Are you seeing this behavior consistently?

I can see it every time I unplug my device. I must conduct some tests,
but seems to be somehow related to cpufreq and maybe the PMIC too (I
have cherry-picked the patches allowing anatop to use a vin-supply). I
didn't have time to bisect, I am sure I didn't have it when cpufreq
was not used at all...

JM
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