Re: rcar-dmac.c: race condition regarding cookie handling?

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Hi Geert,

On 30.01.2024 08:58, Geert Uytterhoeven wrote:
Hi Dirk,

On Tue, Jan 30, 2024 at 8:08=E2=80=AFAM Behme Dirk (CM/ESO2)
<dirk.behme@xxxxxxxxxxxx> wrote:
On 29.01.2024 10:57, Geert Uytterhoeven wrote:
On Wed, Nov 22, 2023 at 8:02=E2=80=AFAM Behme Dirk (CM/ESO2)
<dirk.behme@xxxxxxxxxxxx> wrote:
using a rcar-dmac.c on RCar3 being quite similar to the recent mainlin=
e
one [1] we got a BUG_ON() being hit [2].

Was the system running for a very long time?

Hmm, the trace I have contains boot time stamps (dropped initially) like

[  153.394731] kernel BUG at drivers/dma/sh/../dmaengine.h:54!

I think this "153" implies 153s after boot,  i.e. ~2.5s after system
start. In case there is no wrap around here too.

Yes, that is still quite early in the boot process.
Do you have log info from just before the crash, that might give a clue
which device was trying to use DMA?

No, unfortunately not :(

We just have pure error logging, no complete console logging.

Best regards

Dirk




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