[Rd] Segfault in setMask in R 4.1

[GILLIBERT, Andre]

Hello,

Which graphic device (backend) do you use?
The setMask() function calls the internal setMask function associated to the graphic device.
If the Web application uses one of the standard graphic backend, the bug may come from the R core. If it uses a custom graphic backend, the bug may be in the backend.

-- 
Sincerely
André GILLIBERT

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I have inherited a build of R. We compile R from source and then use a custom
web application to allow users to enter R statements and render the output (it's
kind of like RStudio although the UX is quite different).

Things were going fine until I tried to upgrade to R 4.1.x. The build succeeds,
but I get the following segfault when I make qplot (ggplot2) calls:

     *** caught segfault ***
    address (nil), cause 'memory not mapped'

    Traceback:
     1: .setMask(NULL, NULL)
     2: resolveMask.NULL(NULL)
     3: (function (path) {    UseMethod("resolveMask")})(NULL)
     4: grid.newpage()
     5: print.ggplot(x)
     6: (function (x, ...) UseMethod("print"))(x)

I am not an R developer, so I don't really know how to read this. I am wondering
if this is a known issue or if anyone has any suggestions. Here's some things
I've tested:

- I get the same segfault in R 4.1.0 and R 4.1.1. I do not get this error in R
  4.0.4 or R 4.0.5.

- The problem appears to be specific to the (graphics?) features of R that
  ggplot2 uses. I do not get a segfault if I do a generic `plot(c(1,2,3))`.

- I have tried versions of ggplot2 3.3.3 and 3.3.5.

- The traceback points to files that were introduced in this commit
  https://github.com/wch/r-source/commit/16755bcddffe0cb4238d8a4979387d92b93a8324#diff-5c63f74229830cdde7886a50bf06dafcdf1d5b3d42cfa06b26814876e58c5ab0

I am not an R user or R developer so I'm a bit stuck here. I would be happy to
give the output of any commands. If anyone has any suggestions then please let
me know!

Thanks!
Mike Lee Williams

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