Conversion to dgCMatrix Causes Segmentation Fault

```r
dim(database)
    109578 2389155
class(counts(database))
    "DelayedMatrix"
```
After about four hours.
```r
assay(database, "counts") <- as(assay(database, "counts"), "dgCMatrix")
     *** caught segfault ***
    address 0x7fc394337000, cause 'invalid permissions'
```