The A8 errata doc is at https://developer.arm.com/documentation/prdc008070/latest/ https://developer.arm.com/documentation/prdc008070/latest/ these days and doe

The A8 errata doc is at https://developer.arm.com/documentation/prdc008070/latest/ https://developer.arm.com/documentation/prdc008070/latest/ these days and does have a description of 657417 with enough detail to make writing a reproducer possible. Instructions crossing page boundaries are tricky beasts :-)