Try to increase step size for volumetrics.
It's an old problem for me - I'm using openvdb clouds for renderings and I found that if step size lower than certain value it'll lead to crash instead of increased rendertime. The lower value - the faster crash, with instant crashes at some values.
For scenes 5-8 km in size I found that stable value is 15-20m. Anything lower will crash max after some time and values like 1-3 m will crash instantly.
Same problem I had with phoenix fd. Increasing step solved problem.
Seems like that not only my problem so corona team should look into that. I don't know what's the reason - grid size or scene size, had no time to check that.
P.S. Problem here for at least for half year with all builds.