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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAH-u=83BcUpyjt=tO10xB_3zzbYu5HbhpDzRvZswvkfxvpThag@mail.gmail.com>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/