[Android Q&A, Help & Troubleshooting] speed_bot:
shall i tell the best way to find the reason for bootloop in logcat ??

search for died and read the sentences before it..

D/dalvikvm(17188): GC_EXPLICIT freed 41K, 3% free 2047K/2092K, paused 1ms+0ms, total 9ms
W/Zygote (17188): Class not found for preloading: libcore.icu.ErrorCode
I/System (17188): Loaded time zone names for in 90ms (88ms in ICU)
W/SurfaceFlinger( 1983): Timed out waiting for hw vsync; faking it
I/System (17188): Loaded time zone names for en_US in 68ms (66ms in ICU)
D/dalvikvm(17188): GC_EXPLICIT freed 329K, 14% free 2131K/2464K, paused 1ms+1ms, total 10ms
D/dalvikvm(17188): GC_EXPLICIT freed 15K, 12% free 2192K/2468K, paused 1ms+1ms, total 9ms
D/dalvikvm(17188): GC_EXPLICIT freed 52K, 10% free 2224K/2468K, paused 1ms+1ms, total 9ms
D/dalvikvm(17188): GC_EXPLICIT freed 29K, 9% free 2251K/2472K, paused 1ms+1ms, total 9ms
D/dalvikvm(17188): GC_EXPLICIT freed 38K, 9% free 2267K/2472K, paused 1ms+1ms, total 10ms
D/dalvikvm(17188): GC_EXPLICIT freed 32K, 8% free 2290K/2472K, paused 1ms+0ms, total 10ms
I/Zygote (17188): ...preloaded 2541 classes in 780ms.
D/dalvikvm(17188): GC_EXPLICIT freed 23K, 8% free 2295K/2472K, paused 1ms+1ms, total 10ms
I/Zygote (17188): Preload resources disabled, skipped.
D/dalvikvm(17188): GC_EXPLICIT freed <1K, 8% free 2295K/2472K, paused 1ms+1ms, total 10ms
D/dalvikvm(17188): GC_EXPLICIT freed <1K, 8% free 2295K/2472K, paused 2ms+0ms, total 11ms
D/dalvikvm(17188): GC_EXPLICIT freed <1K, 8% free 2295K/2472K, paused 1ms+1ms, total 9ms
I/dalvikvm(17188): System server process 17192 has been created
I/Zygote (17188): Accepting command socket connections
E/dalvikvm(17192): dlopen("/system/lib/libandroid_servers.so") failed: Cannot load library: soinfo_link_image(linker.cpp:1649): could not load library "libsystem_server.so" needed by "libandroid_servers.so"; caused by soinfo_link_image(linker.cpp:1649): could not load library "libsensorservice.so" needed by "libsystem_server.so"; caused by soinfo_relocate(linker.cpp:989): cannot locate symbol "_ZTVN7android6SensorE" referenced by "libsensorservice.so"...
D/AndroidRuntime(17192): Shutting down VM
W/dalvikvm(17192): threadid=1: thread exiting with uncaught exception (group=0x41b4e930)
I/Process (17192): Sending signal. PID: 17192 SIG: 9
I/Zygote (17188): Exit zygote because system server (17192) has terminated
E/AndroidRuntime(17192): *** FATAL EXCEPTION IN SYSTEM PROCESS: main
E/AndroidRuntime(17192): java.lang.UnsatisfiedLinkError: Cannot load library: soinfo_link_image(linker.cpp:1649): could not load library "libsystem_server.so" needed by "libandroid_servers.so"; caused by soinfo_link_image(linker.cpp:1649): could not load library "libsensorservice.so" needed by "libsystem_server.so"; caused by soinfo_relocate(linker.cpp:989): cannot locate symbol "_ZTVN7android6SensorE" referenced by "libsensorservice.so"...
E/AndroidRuntime(17192): at java.lang.Runtime.loadLibrary(Runtime.java:392)
E/AndroidRuntime(17192): at java.lang.System.loadLibrary(System.java:535)
E/AndroidRuntime(17192): at com.android.server.SystemServer.main(SystemServer.java:1110)
E/AndroidRuntime(17192): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(17192): at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(17192): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
E/AndroidRuntime(17192): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
E/AndroidRuntime(17192): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(17192): Error reporting crash
E/AndroidRuntime(17192): java.lang.NullPointerException
E/AndroidRuntime(17192): at com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeInit.java:76)
E/AndroidRuntime(17192): at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
E/AndroidRuntime(17192): at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
E/AndroidRuntime(17192): at dalvik.system.NativeStart.main(Native Method)
I/ServiceManager( 1976): service 'media.audio_policy' died
I/ServiceManager( 1976): service 'SecTVOutService' died
I/ServiceManager( 1976): service 'media.audio_flinger' died
I/ServiceManager( 1976): service 'media.player' died
I/ServiceManager( 1976): service 'media.camera' died
I/Netd (17208): Netd 1.0 starting

the real problems is in libandroid_servers.so