I have an NDK app out on market and got a native crash report about a SIGILL signal. (I use google breakpad to generate native crash reports.) Here are the details:
Try to put *.so in a folder called 'externallibs' and use it to build by ndk-build, after copy and paste *.so in armeabi-v7a folder.
It helps me.
An other solutions is to remove the Neon Support if it is possible