hang up with r352239 and r352386 with i5-7500

[Mark Johnston]

On Tue, Sep 17, 2019 at 07:20:41AM +0900, Masachika ISHIZUKA wrote:
> > On 2019-09-16 16:06, Masachika ISHIZUKA wrote:
> >>> Can you please use absolute paths to i915kms.ko anyway, just to test?
> >>    The same hang up occure with kld_list="/boot/modules/i915kms.ko"
> >> in /etc/rc.conf.
> >> 
> > 
> > Even after applying the patch I suggested?
> 
>   Yes.
> 
>   kld_list="/boot/modules/drm.ko /boot/modules/i915kms.ko"
> will hang as well.
> 
> /boot/modules/{drm,i915kms}.ko is patched modules.
> 
> # /boot/kernel.r352239/{drm,i915kms}.ko is not patched.

Are you able to collect a kernel dump?  If so, remove the kld_list
setting and set debug.debugger_on_panic=0 and dev.drm.skip_ddb=1.  Then
manually kldload /boot/modules/i915kms.ko.  If you are running an
INVARIANTS kernel you might be hitting an assertion failure; having the
vmcore would help us debug.