am335x: 5.18.x: system stalling

[Ard Biesheuvel]

On Sat, 28 May 2022 at 21:28, Yegor Yefremov <yegorslists at googlemail.com> wrote:
>
> On Sat, May 28, 2022 at 3:14 PM Arnd Bergmann <arnd at arndb.de> wrote:
> >
> > On Sat, May 28, 2022 at 3:01 PM Yegor Yefremov
> > <yegorslists at googlemail.com> wrote:
> > > On Sat, May 28, 2022 at 11:07 AM Ard Biesheuvel <ardb at kernel.org> wrote:
> > > In file included from ./include/linux/irqflags.h:17,
> > >                  from ./arch/arm/include/asm/bitops.h:28,
> > >                  from ./include/linux/bitops.h:33,
> > >                  from ./include/linux/log2.h:12,
> > >                  from kernel/bounds.c:13:
> > > ./arch/arm/include/asm/percpu.h: In function ‘__my_cpu_offset’:
> > > ./arch/arm/include/asm/percpu.h:32:9: error: ‘__per_cpu_offset’
> > > undeclared (first use in this function); did you mean
> > > ‘__my_cpu_offset’?
> > >    32 |  return __per_cpu_offset[0];
> > >       |         ^~~~~~~~~~~~~~~~
> > >       |         __my_cpu_offset
> > > ./arch/arm/include/asm/percpu.h:32:9: note: each undeclared identifier
> > > is reported only once for each function it appears in
> >
> > I think you just missed the line in my patch that adds the
> > "extern unsigned long __per_cpu_offset[];" variable declaration.
>
> My bad.
>
> So, I tried both variants and both led to stalls.
>

Could you please try running slcand under strace (and use the -F
option on slcand), and bring up the link from another terminal
session? That way, we may be able to narrow down the cause of the
stall from the strace output.

On my BB white, it never gets past

openat(AT_FDCWD, "/dev/ttyUSB0", O_RDWR|O_NOCTTY|O_NONBLOCK|O_LARGEFILE) = 3
ioctl(3, TCGETS, {B3000000 -opost -isig -icanon -echo ...}) = 0
ioctl(3, TIOCGSERIAL, 0xbec564fc)       = 0
ioctl(3, TIOCSSERIAL)                   = 0
ioctl(3, TCGETS, {B3000000 -opost -isig -icanon -echo ...}) = 0
ioctl(3, SNDCTL_TMR_STOP or TCSETSW, {B3000000 -opost -isig -icanon
-echo ...}) = 0
ioctl(3, TCGETS, {B3000000 -opost -isig -icanon -echo ...}) = 0
write(3, "C\rS8\r", 5)                  = 5
write(3, "O\r", 2)                      = 2
ioctl(3, TIOCSETD, [17]

but I don't have any actual CAN-to-USB-serial hardware so I'm not sure
if I'm even able to reproduce this.