Just to document this issue I saw while upgrading a 4 switch stack to 15.2(2)E8
1 switch in the stack was stuck in boot loop
error during boot was the following:
Unexpected exception to CPUvector 2000, PC =
This was resolved by moving to IOS
15.0.2-SE11 MD (c2960s-universalk9-mz.150-2.SE11.bin)
I think this is poor from Cisco releasing an IOS with such an obvious troublesome issue.