Audio driver in P9 smartphones with software The versions before EVA-AL10C00B389 has a denial of service (DoS) vulnerability. An attacker tricks a user into installing a malicious application on the smart phone, and the race condition cause null pointer accessing during the application access shared resource, which make the system reboot.
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170802-01-smartphone-en