I was seeing the following drc issues on extracting gds of a 1T1R cell @Tim Edwards. The issue does not show up in the magic layout prior to extraction. I am using the new volare sky130B pdk after installing from mpw-7 git repo.

Via1 width < 0.26um (via.1a + 2 * via.4a)
Metal2 overlap of Via1 < 0.03um in one direction (met2.5 - met2.4)

I don't know how you made that GDS file, but it has a library name that looks like a file path, which is causing issues with Magic. I can modify Magic's code to avoid this, but the simpler solution is just to avoid naming the GDS library with a name that is not a legal GDS structure name, since the problem is that Magic wants to create a cell with the name of the GDS library.

I used

gds write

command on 1T1R.mag file I posted. Can this be a potential problem on running mpw7 pre checks as well?

That's the standard

.magicrc

file. I don't have any idea how the full path gets into the GDS file as the library and cell name. It appears that the cell itself has the full path name, but since magic removes any path component when it reads a file (or at least it's supposed to, and always does for me), then there shouldn't be any way for that to happen. Something is going wrong, either having to do with the file system, or the way you issue commands when you read the file, or something else; but I have never seen that problem before and I don't know of any mechanism that would allow it to happen (obviously there is one, though).