Sometimes I come across crash reports that look quite similar to this one: http://en.miui.com/thread-663538-1-1.html.
In particular, note this:
backtrace:
#00 pc 00000408 /data/data/com.XXXX.YYY/files/libcrashreport.so (deleted) (offset 0x7000)
#01 pc 00091add /system/lib/libart.so (offset 0x1cf000)
It seems to happen on some Android 7 builds. The specific offset in libart.so may be different, so is the offset in libcrashreport.so. But I could not find any mention of libcrashreport in the Android sources. And what would (deleted)
mean? The APK does not ship with such library.
PS: Could this library be part of Apptimize SDK?