linux-kernel - Re: dmapool regression in next

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Message-ID: <CAJKOXPcoK5SsXfXjdAWPHLX2KZRCqOv61HVf2DK9wm4_m+vJ0w@mail.gmail.com>
Date:   Thu, 6 Dec 2018 10:25:20 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     tony@...mide.com
Cc:     tonyb@...ernetics.com, akpm@...ux-foundation.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        andy.shevchenko@...il.com, hch@....de, john.garry@...wei.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux@...linux.org.uk, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org
Subject: Re: dmapool regression in next

On Thu, 6 Dec 2018 at 02:31, Tony Lindgren <tony@...mide.com> wrote:
>
> Hi,
>
> Looks like with commit 26abe88e830d ("mm/dmapool.c: improve scalability
> of dma_pool_free()") I'm now getting spammed with lots of "(bad vaddr)"
> on at least omap4 pandaboard, see below.
>
> Any ideas what might be going wrong?
>
> Regards,
>
> Tony
>
> 8< ---------------------
> omap-dma-engine 4a056000.dma-controller: dma_pool_free 4a056000.dma-controller, (ptrval) (bad vaddr)/0xbe800000
> omap-dma-engine 4a056000.dma-controller: dma_pool_free 4a056000.dma-controller, (ptrval) (bad vaddr)/0xbe80001c
> omap-dma-engine 4a056000.dma-controller: dma_pool_free 4a056000.dma-controller, (ptrval) (bad vaddr)/0xbe800038
> ...

I see it as well on all my Exynos boards, since yesterday's next. In
my case it is the USB EHCI driver:
exynos-ehci 12110000.usb: dma_pool_free ehci_qtd, (ptrval) (bad
vaddr)/0xb8844180
Full log here:
https://krzk.eu/#/builders/1/builds/2937/steps/12/logs/serial0

Best regards,
Krzysztof