[Letux-kernel] weird problem with pwm_bl on omap3

[Andreas Kemnade]

On Tue, 29 May 2018 17:41:53 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi Tony,
> 
> > Am 17.05.2018 um 20:08 schrieb Tony Lindgren <tony at atomide.com>:
> > 
> > * H. Nikolaus Schaller <hns at goldelico.com> [180517 12:17]:  
> >> Hi Tony,
> >> we are using for long time the dmtimer/pwm on
> >> the GTA04 to drive the display panel backlight.
> >> 
> >> Starting a while ago (I am not sure when, but it may
> >> be 4.17-rc1), the device randomly fails to boot
> >> with a NULL pointer dereference in strcmp().
> >> Booting again usually runs fine.  
> > 
> > Hmm maybe enable CONFIG_DEBUG_SLAB=y and POISON options
> > and see if that catches something. It's might be some
> > array out of bounds type issue.
> > 
> > Regards,
> > 
> > Tony  
> 
> 
> I have restarted hunting the issue but it is very
> ghostly. Every time I try to test by another method
> it disappears and if I remove my printk things or
> /etc/modprobe/blacklist.conf it comes back.
> 
Have you tried to load every module piece by piece before running udev
by booting the kernel with a init=/something.sh script?
So you have the order under control?

Another thing: Are our fb patches evil again?

The offmode patch? Maybe it uncovers some other bug.

Just to sort out some non-mainline stuff

I am compiling and will try to boot with my scripts this evening.

Regards,
Andreas
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