There are intermittent failures on PPC64 due to hardware traps. IIRC this problem also occured on PPC32 but I'm not so sure about that because it has been quite some time since we had PPC32 regression tests.
The fault address seems to be rather static. Most failures are at 0x3ffd7fff08b0.
Additional failures at 0x3ffd7fff08b0
Failures at 0x3ffd7fff0c50
PPC64, possibly also PPC32