am335x: 5.18.x: system stalling

[Yegor Yefremov]

Hi Arnd,

On Thu, May 12, 2022 at 10:43 AM Arnd Bergmann <arnd at arndb.de> wrote:
>
> On Thu, May 12, 2022 at 7:41 AM Tony Lindgren <tony at atomide.com> wrote:
> > * Yegor Yefremov <yegorslists at googlemail.com> [220511 14:16]:
> > > On Thu, May 5, 2022 at 7:08 AM Tony Lindgren <tony at atomide.com> wrote:
> > > > * Yegor Yefremov <yegorslists at googlemail.com> [220504 10:35]:
> > > > > Hi Tony, all,
> > > > >
> > > > > since kernel 5.18.x (5.17.x doesn't show this behavior), the system
> > > > > stalls as soon as I invoke the following commands (initializing
> > > > > USB-to-CAN converter):
> > > > >
> > > > > slcand -o -s8 -t hw -S 3000000 /dev/ttyUSB0
> > > > > ip link set slcan0 up
>
> Oh, I missed this part at first and only looked at the backtrace.
> Which CAN driver
> are you using? It's likely a problem in the kernel driver.

I am using the slcan driver [1].

> CONFIG_DMA_API_DEBUG is still likely to pinpoint the bug, but I might also
> just see it by looking at the right source file.

I'll try to get more debug info with CONFIG_DMA_API_DEBUG.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/can/slcan.c?h=v5.18-rc6

Yegor
>        Arnd