On Mon, 2016-10-10 at 22:36 +0800, Lucha Chen wrote:

Dear All,   userspace app receive SIGSEGV, but not crash, why?   The mtk kernel log is : <4>[67330.976640] -(6)[25390:ndroid.systemui][25390:ndroid.systemui] sig 11 to [25390:ndroid.systemui] stat=R

The userspace application can tell the kernel it has a handler for SIGSEGV. If it does that, the kernel will make sure that the handler is invoked when SIGSEGV is sent to the process.