Re: 6.8 powerbook g4 radeon driver kernel panic

On 2020-11-08 02:40:26 +0000 Jonathan Gray <[email protected]> wrote:

> On Sat, Nov 07, 2020 at 04:01:34PM +0000, Anthony Richardby wrote:
>> Hey,
>> I'm experiencing a kernel panic whenever I run glxgears, or it would
>> seem when I try to run other gpu-related tasks. I first noticed this
>> when playing video via the application 'mpv', after a couple of
>> seconds of video the system freezes!! I've got the trace output for
>> that as the time delay allows me to switch out of X11 to a console
>> before the system crashes. Anyway after this I tried 'glxgears' and
>> that crashes immediately (so I'm unable to get the trace, but it
>> sounds like it's related?).
>
>> Just wondering if anyone else is able to reproduce this on their
>> powerbooks / other g4 macs, does glxgears work for you?
>
>> Pic of the trace output: https://postimg.cc/wRLGLKdF
>
> What is the actual panic message?
>
> For the archives the trace was:
>
> panic(b6ae0c) at panic+0x154
> mtx_enter(0) at mtx_enter+0x8c
> drm_update_vblank_count(2a0fcdf8,e000a000,b6ae78) at
> drm_update_vblank_count+0x4b8
> drm_handle_vblank(2000611,82720e) at drm_handle_vblank+0xd8
> r100_irq_process(a19ca0) at r100_irq_process+0x110
> radeon_driver_irq_handler_kms(0) at radeon_driver_irq_handler_kms+0x28
> openpic_ext_intr() at openpic_ext_intr+0x274
> extint_call() at extint_call
> --- interrupt ---
> at 0xe7055e1c
> drm_wait_vblank_ioctl(e0732f00,e06b9b84,e7055c60) at
> drm_wait_vblank_ioctl+0xb2
> drm_do_ioctl(251571d0) at drm_do_ioctl+0x298
> drmioctl(25157100,e7055ca8,990000,c010643a,3a033428) at drmioctl+0xbc
>
>
>

The panic message is:
panic: mtx 0xe024cc50: locking against myself

I forgot to mention that this is new in 6.8, I can run glxgears/play
video with mpv fine using 6.7.