QNX4.25 mem/pmem.c(188)

On one of the controllers with QNX4.25 we get an irregular OS crash (attached photo).

“mem / pmem.c (188) inserting [fffff, 1] between [3271, d] and [fffff, 1]”

The only thing that was found was the too mach old time discussion openqnx.com/newsgroups/viewtopic.php?t=
but it didn’t clarify anything.

The controller uses an industrial PCI-6028 board, MOXA multiport boards (4 pcs., 8 ports each),
updated driver Dev32.ser .

Have you come across a similar emergency conclusion? What could be the reason?