title: ANR crash after a few seconds when stopping at breakpoint in main thread (AOSP - RK3288 box)
body: <p>I have an RK3288 box, for which I am developing an app. </p>
  
  <p>I'm having an issue which is causing a lot of headache to me. I can't debug anything all.<br>
  Every-time I attach the debugger, when I hit a breakpoint which is on main thread, my app crashes after a few seconds.
  Below is the logcat when that happens:</p>
  
  <pre><code>05-02 20:52:39.734 459-534/system_process I/InputDispatcher: Application is not responding: Window{3026b626 u0 com.kushtrim.playground/com.kushtrim.playground.MainActivity}.  It has been 5001.8ms since event, 5001.6ms since wait started.  Reason: Waiting to send non-key event because the touched window has not finished processing certain input events that were delivered to it over 500.0ms ago.  Wait queue length: 17.  Wait queue head age: 5505.1ms.
  05-02 20:52:39.794 459-534/system_process I/WindowManagerService: Input event dispatching timed out sending to com.kushtrim.playground/com.kushtrim.playground.MainActivity.  Reason: Waiting to send non-key event because the touched window has not finished processing certain input events that were delivered to it over 500.0ms ago.  Wait queue length: 17.  Wait queue head age: 5505.1ms.
  05-02 20:52:39.811 459-482/system_process I/Process: Sending signal. PID: 8790 SIG: 3
  05-02 20:52:39.812 8790-8799/com.kushtrim.playground I/art: Thread[5,tid=8799,WaitingInMainSignalCatcherLoop,Thread*=0xb7294b58,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:39.970 459-482/system_process I/Process: Sending signal. PID: 459 SIG: 3
  05-02 20:52:39.970 459-468/system_process I/art: Thread[5,tid=468,WaitingInMainSignalCatcherLoop,Thread*=0xb7113410,peer=0x12c020a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:39.970 8790-8799/com.kushtrim.playground I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:40.123 459-478/system_process E/SensorsHal: poll() failed (Interrupted system call)
  05-02 20:52:40.824 459-981/system_process E/WifiHAL: Error polling socket
  05-02 20:52:40.900 6611-6661/com.solaborate.hello D/Webrtc_calls: SocketIoStatus conected: true , socketId: 9U55YZnsB0EeSDcHACui
  05-02 20:52:41.018 459-482/system_process I/Process: Sending signal. PID: 852 SIG: 3
  05-02 20:52:41.019 852-864/com.android.phone I/art: Thread[5,tid=864,WaitingInMainSignalCatcherLoop,Thread*=0xb7113410,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:41.023 459-1442/system_process W/ActivityManagerService: Missing app error report, app = com.kushtrim.playground crashing = false notResponding = true
  05-02 20:52:41.028 459-468/system_process I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.028 459-482/system_process I/Process: Sending signal. PID: 811 SIG: 3
  05-02 20:52:41.029 811-820/com.android.inputmethod.latin I/art: Thread[5,tid=820,WaitingInMainSignalCatcherLoop,Thread*=0xb7112928,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:41.152 811-820/com.android.inputmethod.latin I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.152 459-482/system_process I/Process: Sending signal. PID: 628 SIG: 3
  05-02 20:52:41.152 628-636/com.android.systemui I/art: Thread[5,tid=636,WaitingInMainSignalCatcherLoop,Thread*=0xb7112928,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:41.209 852-864/com.android.phone I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.209 459-482/system_process I/Process: Sending signal. PID: 712 SIG: 3
  05-02 20:52:41.209 712-719/com.cghs.stresstest I/art: Thread[5,tid=719,WaitingInMainSignalCatcherLoop,Thread*=0xb7112a18,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:41.286 712-719/com.cghs.stresstest I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.286 459-482/system_process I/Process: Sending signal. PID: 591 SIG: 3
  05-02 20:52:41.286 591-600/android.process.media I/art: Thread[5,tid=600,WaitingInMainSignalCatcherLoop,Thread*=0xb7112928,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:41.313 628-636/com.android.systemui I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.396 591-600/android.process.media I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:41.554 459-913/system_process W/ActivityManagerService: Missing app error report, app = com.kushtrim.playground crashing = false notResponding = true
  05-02 20:52:42.094 459-944/system_process W/ActivityManagerService: Missing app error report, app = com.kushtrim.playground crashing = false notResponding = true
  05-02 20:52:43.304 459-1982/system_process W/ActivityManagerService: Missing app error report, app = com.kushtrim.playground crashing = false notResponding = true
  05-02 20:52:43.869 459-482/system_process I/art: Explicit concurrent mark sweep GC freed 58037(3MB) AllocSpace objects, 10(257KB) LOS objects, 33% free, 19MB/28MB, paused 811us total 53.345ms
  05-02 20:52:43.883 459-482/system_process W/ProcessCpuTracker: Skipping unknown process pid 9185
  05-02 20:52:44.189 459-4388/system_process W/ActivityManagerService: Missing app error report, app = com.kushtrim.playground crashing = false notResponding = true
  05-02 20:52:44.418 459-482/system_process I/Process: Sending signal. PID: 1155 SIG: 3
  05-02 20:52:44.418 1155-1164/com.waxrain.airplaydmr I/art: Thread[5,tid=1164,WaitingInMainSignalCatcherLoop,Thread*=0xb7112928,peer=0x32c070a0,"Signal Catcher"]: reacting to signal 3
  05-02 20:52:44.540 1155-1164/com.waxrain.airplaydmr I/art: Wrote stack traces to '/data/anr/traces.txt'
  05-02 20:52:44.549 459-482/system_process E/ActivityManagerService: ANR in com.kushtrim.playground (com.kushtrim.playground/.MainActivity)
                                                                      PID: 8790
                                                                      Reason: Input dispatching timed out (Waiting to send non-key event because the touched window has not finished processing certain input events that were delivered to it over 500.0ms ago.  Wait queue length: 17.  Wait queue head age: 5505.1ms.)
                                                                      Load: 1.48 / 1.36 / 1.86
                                                                      CPU usage from 567ms to -4733ms ago:
                                                                        31% 459/system_server: 14% user + 17% kernel / faults: 6486 minor 5 major
                                                                        0% 164/debuggerd: 0% user + 0% kernel / faults: 3474 minor 5 major
                                                                        8.6% 161/surfaceflinger: 5.6% user + 3% kernel / faults: 629 minor
                                                                        0% 852/com.android.phone: 0% user + 0% kernel / faults: 2463 minor
                                                                        2.8% 8790/com.kushtrim.playground: 1.1% user + 1.7% kernel / faults: 1497 minor
                                                                        0.6% 628/com.android.systemui: 0.3% user + 0.2% kernel / faults: 1800 minor 2 major
                                                                        0% 811/com.android.inputmethod.latin: 0% user + 0% kernel / faults: 2089 minor
                                                                        2.2% 1155/com.waxrain.airplaydmr: 1.5% user + 0.7% kernel / faults: 1754 minor
                                                                        2% 174/adbd: 0.1% user + 1.8% kernel / faults: 564 minor
                                                                        0% 591/android.process.media: 0% user + 0% kernel / faults: 2149 minor 1 major
                                                                        0% 712/com.cghs.stresstest: 0% user + 0% kernel / faults: 1984 minor
                                                                        0.9% 69/cfinteractive: 0% user + 0.9% kernel
                                                                        0.5% 153/dhd_dpc: 0% user + 0.5% kernel
                                                                        0.5% 155/logd: 0.3% user + 0.1% kernel
                                                                        0.3% 68/rk-fb: 0% user + 0.3% kernel
                                                                        0.3% 152/dhd_watchdog_th: 0% user + 0.3% kernel
                                                                        0.1% 8/rcu_preempt: 0% user + 0.1% kernel
                                                                        0.1% 14/ksoftirqd/1: 0% user + 0.1% kernel
                                                                        0.1% 19/ksoftirqd/2: 0% user + 0.1% kernel
                                                                        0.1% 24/ksoftirqd/3: 0% user + 0.1% kernel
                                                                        0.1% 67/fb-vsync: 0% user + 0.1% kernel
                                                                        0.1% 110/mmcqd/0: 0% user + 0.1% kernel
                                                                        0.1% 122/irq/198-mma8452: 0% user + 0.1% kernel
                                                                        0.1% 507/mediaserver: 0% user + 0.1% kernel / faults: 12 minor
                                                                        0% 1174/com.android.settings: 0% user + 0% kernel / faults: 22 minor
                                                                        0.1% 1252/wdog2: 0% user + 0.1% kernel
                                                                        0.1% 1486/com.skype.raider: 0.1% user + 0% kernel / faults: 6 minor
                                                                        0.1% 2355/com.tencent.mm:push: 0% user + 0.1% kernel / faults: 331 minor
                                                                        0.1% 4835/wpa_supplicant: 0% user + 0.1% kernel
                                                                        0.1% 6611/com.solaborate.hello: 0.1% user + 0% kernel / faults: 12 minor
                                                                        0% 7891/kworker/2:2: 0% user + 0% kernel
                                                                        0.1% 7974/kworker/0:1: 0% user + 0.1% kernel
                                                                        0.1% 8875/logcat: 0.1% user + 0% kernel
                                                                       +0% 9168/kworker/u8:4: 0% user + 0% kernel
                                                                      19% TOTAL: 8.1% user + 11% kernel + 0.3% iowait + 0% softirq
                                                                      CPU usage from 4062ms to 4577ms later:
                                                                        7.6% 459/system_server: 3.8% user + 3.8% kernel / faults: 27 minor
                                                                          3.8% 482/ActivityManager: 1.9% user + 1.9% kernel
                                                                          1.9% 487/android.display: 1.9% user + 0% kernel
                                                                        5.7% 161/surfaceflinger: 1.9% user + 3.8% kernel / faults: 14 minor
                                                                          1.9% 161/surfaceflinger: 1.9% user + 0% kernel
                                                                          1.9% 314/DispSync: 0% user + 1.9% kernel
                                                                          1.9% 433/surfaceflinger: 0% user + 1.9% kernel
                                                                          1.9% 552/Binder_4: 1.9% user + 0% kernel
                                                                        1.3% 14/ksoftirqd/1: 0% user + 1.3% kernel
                                                                        1.3% 19/ksoftirqd/2: 0% user + 1.3% kernel
                                                                        1.4% 153/dhd_dpc: 0% user + 1.4% kernel
                                                                        1.4% 174/adbd: 0% user + 1.4% kernel / faults: 60 minor
                                                                          1.4% 174/adbd: 1.4% user + 0% kernel
                                                                        1.5% 1155/com.waxrain.airplaydmr: 1.5% user + 0% kernel
                                                                      6.4% TOTAL: 2.4% user + 3.9% kernel
  </code></pre>
  
  <p>Now, I did some research of my own, and found out in normal conditions <a href="https://developer.android.com/training/articles/perf-anr.html#anr" rel="nofollow noreferrer">ANR is triggered when there is no response to a touch event for more than 5s</a>, which seems to be what's happening here.  </p>
  
  <p>While, this is OK for normal operation of the app, this shouldn't happen if I put a breakpoint on an button <em>OnClickListener</em>, but in my case it does.  </p>
  
  <p>This doesn't happen to me on any other phone, just in this board.  </p>
  
  <p>What can I do to fix this, and debug peacefully at last ?</p>
  
  <p>I should mention that I also have the OS code (AOSP + kernel), and have compiled/installed it myself, so I can modify the OS if needed.</p>
  
  <p>Here are the ANR traces if they help: <a href="https://pastebin.com/C3dh9rzK" rel="nofollow noreferrer">https://pastebin.com/C3dh9rzK</a>  </p>
  
  <p><strong>EDIT:</strong><br>
  It seems this is not an issue with the app, but something in OS. 
  I was able to reproduce the crash in a brand new project, in which I just added a button and an OnClickListener. I then put a breakpoint inside the listener, attached the debugger and clicked the button. KA-BOOOM.</p>