title: Android Webcore: libwebcore.so crashes on API 15 & 16
body: <p>My app uses Android Webview to display some user interfaces, we found a crash which is reported by users, the stack trace is like this:</p>
  
  <pre><code>#00 pc 00110c74 /system/lib/libwebcore.so
  #01 pc 00110cb8 /system/lib/libwebcore.so
  #02 pc 00110e26 /system/lib/libwebcore.so
  #03 pc 0011118c /system/lib/libwebcore.so
  #04 pc 0012c4c6 /system/lib/libwebcore.so
  #05 pc 0039c8ac /system/lib/libwebcore.so
  #06 pc 003a05d2 /system/lib/libwebcore.so
  #07 pc 00394bce /system/lib/libwebcore.so
  #08 pc 00394cac /system/lib/libwebcore.so
  #09 pc 00394d44 /system/lib/libwebcore.so
  #10 pc 0015d8b8 /system/lib/libwebcore.so
  #11 pc 00160f24 /system/lib/libwebcore.so
  #12 pc 0016e3a2 /system/lib/libwebcore.so
  #13 pc 0016ce36 /system/lib/libwebcore.so
  #14 pc 0028b484 /system/lib/libwebcore.so
  #15 pc 00289952 /system/lib/libwebcore.so
  #16 pc 0028a55c /system/lib/libwebcore.so
  #17 pc 00110208 /system/lib/libwebcore.so
  java:
  java.lang.Thread.getStackTrace(Thread.java:591)
  android.webkit.JWebCoreJavaBridge.nativeServiceFuncPtrQueue(Native Method)
  android.webkit.JWebCoreJavaBridge.handleMessage(JWebCoreJavaBridge.java:113)
  android.os.Handler.dispatchMessage(Handler.java:99)
  android.os.Looper.loop(Looper.java:137)
  android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:1057)
  java.lang.Thread.run(Thread.java:856)
  </code></pre>
  
  <p>by using our trace report system , I found that this crash only occurs on devices with API 15 or API 16 system(API under 15 is not traced), I can't find a way to reproduce this crash.</p>
  
  <p>Is there anyone who has some experience for this?</p>