[Lima] LIMA kernel bug - help!

[Linus Walleij]

Hi Qiang,

I am using Lima on the ST-Ericsson U8500 SoC. It is one
of the very earliest versions of MALI 400 MP. It mostly works
on the mobile phones I have using PostmarkeOS and
the Phosh UI (Wayland with MESA), but now I have an issue with
one single specimen.

I have this bug in my dmesg and after this the graphics
start to act weird:

[   48.662336] lima a0300000.gpu: mmu page fault at 0x2020400 from bus
id 0 of type read on ppmmu0
[   48.662464] lima a0300000.gpu: fail to save task state from phoc
pid 1581: error task list is full
[   48.662481] lima a0300000.gpu: pp task error 0 int_state=0 status=1
[   48.662494] lima a0300000.gpu: mmu resume

In interrupts:

 75:          5          0     GIC-0 147 Level     gp
 76:          0          0     GIC-0 146 Level     gpmmu
 77:          3          0     GIC-0 145 Level     pp0
 78:          1          0     GIC-0 144 Level     ppmmu0

My UI definitely want to render some more stuff so it gets
stuck here.

Any hints on how to troubleshoot this?

Yours,
Linus Walleij