Comment # 23 on bug 1029634 from Oliver Kurz

(In reply to Takashi Iwai from comment #22)
> I managed to bisect and found the culprit patch.  Ironically, it's a fix for
> S3 resume with SKL MST (bsc#1015359).

funny ;-)

linux-4.4.56-2.1.g0b839db-default PASSED -> no crash

(crosschecked that the crash still appears with kernel-default-4.4.49)

so I confirm your revert of the patch fixes the problem for me.