Hi.

A machine, running for quite a ~2 months stably now, just crashed with a
kernel panic leaving pretty strange messages, like

swap_free: Unused swap offset entry 00001000
swap_dup: Bad swap file entry 00000020

and

memory.c:306: bad pmd c30b63e8(0000000028d2d027) 
memory.c:306: bad pmd c30b6488(000000002b891066)

in the logs...
I am not sure whether this is a memory problem or a kernel bug... oops+
relevant part of the logfile is attached.