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Message-ID: <b71b85a588c3e27d2de129723468263d932ab435.camel@suse.com>
Subject: Re: usb: cdc-acm: BUG kmalloc-128 Poison overwritten
From:   Oliver Neukum <oneukum@suse.com>
To:     Bruno Thomsen <bruno.thomsen@gmail.com>
Cc:     linux-usb@vger.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        Bruno Thomsen <bth@kamstrup.com>,
        Lars Alex Pedersen <laa@kamstrup.com>
Date:   Thu, 25 Feb 2021 10:57:50 +0100
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Am Mittwoch, den 24.02.2021, 16:21 +0100 schrieb Bruno Thomsen:

Hi,

> No, this is not a regression from 5.10. It seems that many attempts to
> fix cdc-acm in the 5.x kernel series have failed to fix the root cause of
> these oops. I have not seen this on 4.14 and 4.19, but I have observed
> it on at least 5.3 and newer kernels in slight variations.
> I guess this is because cdc-acm is very common in the embedded
> ARM world and rarely used on servers or laptops. Combined with
> ARM devices still commonly use 4.x LTS kernels. Not sure if
> hardening options on the kernel has increased change of reproducing
> oops.

OK, so this is not an additional problem.
According to your logs, an URB that should have been killed wasn't.

> I am ready to test new patches and will continue to report oops

Could you test the attached patches?

	Regards
		Oliver


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