Unity crashed on android, pthread_create

1 #00 pc 004391b8 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 2 #01 pc 00438e68 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 3 #02 pc 004341d0 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 4 #03 pc 0040fd20 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 5 #04 pc 0040f5f4 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 6 #05 pc 0040f530 /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 7 #06 pc 0046a57c /data/app-lib/com.mytest.mytest-1/libunity.so [armeabi-v7a::1422b9cd965931de49e06a8f04992c33] 8 #07 pc 0000cc60 /system/lib/libc.so (__thread_entry+72) [armeabi-v7a::093b16ddf21000f2996980f23289e6ad] 9 #08 pc 0000cddc /system/lib/libc.so (pthread_create+208) [armeabi-v7a::093b16ddf21000f2996980f23289e6ad

some android phone has this crash, Any ideas why this crashes?