Galaxy Tab seems to use the Nvidia Tegra 2 processor. Recently, a bug was fixed in the NDK that created incorrect code for Tegra 2 processors associated with floating point instructions. Here is a quote from the NDK r7c changelog :
NDK Tegra2 :
: GNU STL armeabi-v7a, , NEON. , NDK r7b, , Tegra2 (, cosf, sinf, expf).
OpenCV NDK r7c.