I think it would be pretty unlikely to trigger rowhammer accidentally. The incidence of random (memory) errors is very low. Something like once every 1.5 years...
Our first observation is that memory errors are not rare
events. About a third of all machines in the fleet experience
at least one memory error per year (see column CE Incid.
%) and the average number of correctable errors per year
is over 22,000. These numbers vary across platforms, with
some platforms (e.g. Platform A and B) seeing nearly 50% of
their machines affected by correctable errors, while in others
only 12–27% are affected. The median number of errors per year for those
machines that experience at least one error ranges from 25 to 611.
Hardware error is almost certain in this case. c.f. rowhammer or bitsquatting.