I'm not aware of a B-52 being crashed in a barrel roll, but this did make me think of the 1994 Fairchild crash[0] that was caused by a pilot who was known as dangerous due to excessive self confidence. In this case he banked too tightly at low level causing a stall into the ground. The whole crash was caught on camera[1], which is indelibly burnt into my memory.

[0] - https://en.wikipedia.org/wiki/1994_Fairchild_Air_Force_Base_...

[1] - https://theaviationgeekclub.com/the-story-of-bud-holland-the...