somtime crash android.
why is occur??
Fatal signal 11 (SIGSEGV), code 1, fault addr 0xd600799c in tid 15303 (RenderThread 1)
08-24 16:35:16.643: D/InputDispatcher(1222): notifyMotion - action=POINTER_UP, eventTime=2937987840209000, downTime=2937928873984000
08-24 16:35:16.643: D/InputTransport(1222): channel '343b99c0 com.test.app/com.epicgames.ue4.GameActivity (server)' : action=POINTER_UP, downTime=2937928873984000, eventTime=2937987840209000, pointerCount=2
08-24 16:35:16.643: I/ViewRootImpl(15260): ViewRoot's Touch Event : ACTION_POINTER_UP(1)
08-24 16:35:16.663: D/UE4(15260): **Signal 7 caught!**
08-24 16:35:16.663: A/libc(15260): Fatal signal 11 (SIGSEGV), code 1, fault addr 0xd600799c in tid 15303 (RenderThread 1)
08-24 16:35:16.693: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:16.723: I/DEBUG(466): [2016-08-24 16:35:16.734]
08-24 16:35:16.723: I/DEBUG(466): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
08-24 16:35:16.723: I/DEBUG(466): Build fingerprint: 'lge/p1_skt_kr/p1:5.1/LMY47D/160121549a55c:user/release-keys'
08-24 16:35:16.723: I/DEBUG(466): Revision: '11'
08-24 16:35:16.723: I/DEBUG(466): ABI: 'arm'
08-24 16:35:16.723: I/DEBUG(466): pid: 15260, tid: 15303, name: RenderThread 1 >>> com.test.app <<<
08-24 16:35:16.723: I/DEBUG(466): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xd600799c
08-24 16:35:16.723: W/NativeCrashListener(1222): Couldn't find ProcessRecord for pid 1530015793
08-24 16:35:16.723: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1344000
08-24 16:35:16.743: I/DEBUG(466): r0 d6017c4c r1 d6007bbc r2 dc647e50 r3 00000000
08-24 16:35:16.743: E/DEBUG(466): AM write failure (32 / Broken pipe)
08-24 16:35:16.743: I/DEBUG(466): r4 b104cd40 r5 d6017c90 r6 00000007 r7 00000001
08-24 16:35:16.743: I/DEBUG(466): r8 fffd50a4 r9 d6017d10 sl c790e580 fp d6017c40
08-24 16:35:16.743: I/DEBUG(466): ip 00000001 sp d6007948 lr dc648c44 pc d7a19208 cpsr a0070010
08-24 16:35:16.743: I/DEBUG(466): backtrace:
08-24 16:35:16.743: I/DEBUG(466): #00 pc 0187f208 /data/app/com.test.app-1/lib/arm/libUE4.so (AndroidCrash::Handle(FGenericCrashContext const&)+56)
08-24 16:35:16.743: I/DEBUG(466): #01 pc 0000bc8c <unknown>
08-24 16:35:16.743: W/libbacktrace(466): virtual bool BacktracePtrace::ReadWord(uintptr_t, word_t*): invalid pointer 0xd6007908 reading from tid 15303, ptrace() strerror(errno)=I/O error
08-24 16:35:16.743: W/libbacktrace(466): virtual bool BacktracePtrace::ReadWord(uintptr_t, word_t*): invalid pointer 0xd6007948 reading from tid 15303, ptrace() strerror(errno)=I/O error
08-24 16:35:16.753: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1440000
08-24 16:35:16.923: D/InputDispatcher(1222): notifyMotion - action=POINTER_DOWN, eventTime=2937988124184000, downTime=2937928873984000
08-24 16:35:16.923: D/InputTransport(1222): channel '343b99c0 com.test.app/com.epicgames.ue4.GameActivity (server)' : action=POINTER_DOWN, downTime=2937928873984000, eventTime=2937988124184000, pointerCount=2
08-24 16:35:17.023: D/PowerManagerServiceEx(1222): updateUserActivitySummaryLocked: mWakefulness=Awake, mUserActivitySummary=0x1, nextTimeout=4917889806 (in 1979901582 ms)
08-24 16:35:17.043: D/InputDispatcher(1222): notifyMotion - action=POINTER_UP, eventTime=2937988240623000, downTime=2937928873984000
08-24 16:35:17.043: D/InputTransport(1222): channel '343b99c0 com.test.app/com.epicgames.ue4.GameActivity (server)' : action=POINTER_UP, downTime=2937928873984000, eventTime=2937988240623000, pointerCount=2
08-24 16:35:17.143: D/InputDispatcher(1222): Waiting for application to become ready for input: Window{343b99c0 u0 com.test.app/com.epicgames.ue4.GameActivity}. Reason: Waiting because the touched window's input channel is full. Outbound queue length: 1. Wait queue length: 53.
08-24 16:35:17.293: D/InputDispatcher(1222): notifyMotion - action=ACTION_UP, eventTime=2937988498286000, downTime=2937928873984000
08-24 16:35:17.313: V/WifiServerServiceExt(1222): checkPollTimer Cnt= 0 rssi =-53 threshold=-100
08-24 16:35:17.313: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1344000
08-24 16:35:17.343: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.373: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.443: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.473: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.523: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.553: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.613: E/ThermalEngine(483): ==== Enter sched_bmhb_cs_gov -> vs_temp = 35 ===
08-24 16:35:17.643: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.673: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.703: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.733: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1344000
08-24 16:35:17.763: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.793: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.853: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.883: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.913: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.943: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:17.973: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:17.983: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1344000
08-24 16:35:18.013: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:18.043: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 960000
08-24 16:35:18.093: I/DEBUG(466): Tombstone written to: /data/tombstones/tombstone_07
08-24 16:35:18.093: I/BootReceiver(1222): Copying /data/tombstones/tombstone_07 to DropBox (SYSTEM_TOMBSTONE)
08-24 16:35:18.093: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1248000
08-24 16:35:18.123: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1344000
08-24 16:35:18.153: E/ThermalEngine(483): ACTION: CLUSTER - Setting CLUSTER[1] to 1440000
08-24 16:35:18.333: V/AudioFlinger(471): 15260 died, releasing its sessions
08-24 16:35:18.333: I/WindowState(1222): WIN DEATH: Window{343b99c0 u0 com.test.app/com.epicgames.ue4.GameActivity}