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[Android] fix callGcanvas导致的野指针问题 #2009
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fix the issue #2008
A native crash with the stack:
SIGSEGV(SEGV_MAPERR):
#00 pc 0001a0a8 /system/lib/libc.so (strlen+71) [armeabi-v7a::bd65f13f1451c6c1a34a12381914242d]
#1 pc 002e693d /system/lib/libart.so (_ZN3art6mirror6String21AllocFromModifiedUtf8EPNS_6ThreadEPKc+8) [armeabi-v7a::383e31579b74445b901dcaeb5b37276b]
#2 pc 002b18ff /system/lib/libart.so (_ZN3art3JNI12NewStringUTFEP7_JNIEnvPKc+386) [armeabi-v7a::383e31579b74445b901dcaeb5b37276b]
#3 pc 00068b53 /lib/arm/libweexcore.so [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#4 pc 00067d41 /lib/arm/libweexcore.so (ZNSt17_Function_handlerIFSt10unique_ptrI9IPCResultSt14default_deleteIS1_EEP12IPCArgumentsEPS7_E9_M_invokeERKSt9_Any_dataS6+8) [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#5 pc 0006dc21 /lib/arm/libweexcore.so [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#6 pc 0006d1df /lib/arm/libweexcore.so [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#7 pc 00065fff /lib/arm/libweexcore.so (_ZN8WeexCore9WeexProxy6execJSEP7_JNIEnvP8_jobjectP8_jstringS6_S6_P13_jobjectArray+438) [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#8 pc 000610a1 /lib/arm/libweexcore.so [armeabi-v7a::aa03e3a40249fd5e6a4e92bffa1aeb1a]
#9 pc 00005605 /oat/arm/base.odex (oatexec+22021) [armeabi::74a1ccfee55579129f21b2286efa74e9]
the crash address is not the only and not zero.
the restore stack ：
./aarch64-linux-android-addr2line -e /libweexcore.so -f 00068b53 00067d41 0006dc21 0006d1df 00065fff 000610a1
_ZN7_JNIEnv12NewStringUTFEPKc
/Android/sdk/ndk-bundle/sysroot/usr/include/jni.h:842
ZNSt17_Function_handlerIFSt10unique_ptrI9IPCResultSt14default_deleteIS1_EEP12IPCArgumentsEPS7_E9_M_invokeERKSt9_Any_dataS6
/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/functional:2025 (discriminator 1)
ZNKSt8functionIFSt10unique_ptrI9IPCResultSt14default_deleteIS1_EEP12IPCArgumentsEEclES6
/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/functional:2439 (discriminator 1)
_ZN12_GLOBAL__N_113IPCSenderImpl4sendEP9IPCBuffer
/weex_core/Source/IPC/IPCSender.cpp:80 (discriminator 1)
_ZN8WeexCore9WeexProxy6execJSEP7_JNIEnvP8_jobjectP8_jstringS6_S6_P13_jobjectArray
/weex_core/Source/android/jsengine/multiprocess/WeexProxy.cpp:432 (discriminator 1)
the weex core version: 0.19.0-release