(In reply to comment #11)
> dmesg is attatched here.
> dmesg shows that the freeze is caused by mutex lock.
>
> It may be caused by below sequence.
> 1. mutex locked and not unlocked.
> 2. DRM_IOCTL_I915_GEM_PREAD wait the lock.
> 3. dmesg shows error ( 120s after freeze ).
(In reply to comment #11) I915_GEM_ PREAD wait the lock.
> dmesg is attatched here.
> dmesg shows that the freeze is caused by mutex lock.
>
> It may be caused by below sequence.
> 1. mutex locked and not unlocked.
> 2. DRM_IOCTL_
> 3. dmesg shows error ( 120s after freeze ).
Or it's a missed interrupt ;-)
Want to place a bet?