Segfault: memory not mapped, with renv

Issue

I am getting the following error running VS Code R with the vscode-R and R-LSP extensions with a project using the renv package.

[2021-06-02 13:00:30.396] parse session init error 1 {
  "code": 501,
  "message": "R session crashed with exit code -11",
  "result": null,
  "stdout": "",
  "stderr": "\n *** caught segfault ***\naddress 0x7fa2bb756a40, cause 'memory not mapped'\n\nTraceback:\n 1: pxlib$write_fd(as.integer(3), data)\n 2: eval(quote({    pxlib <- as.environment(\"tools:callr\")$`__callr_data__`$pxlib    code_ <- 201    fd_ <- 3    text_ <- \"ready to go\"    data <- paste0(code_, \" 0 \", text_, \"\\n\")    pxlib$write_fd(as.integer(3), data)}), new.env())\n 3: eval(quote({    pxlib <- as.environment(\"tools:callr\")$`__callr_data__`$pxlib    code_ <- 201    fd_ <- 3    text_ <- \"ready to go\"    data <- paste0(code_, \" 0 \", text_, \"\\n\")    pxlib$write_fd(as.integer(3), data)}), new.env())\n 4: eval(expr, p)\n 5: eval(expr, p)\n 6: eval.parent(substitute(eval(quote(expr), envir)))\n 7: local({    pxlib <- as.environment(\"tools:callr\")$`__callr_data__`$pxlib    code_ <- 201    fd_ <- 3    text_ <- \"ready to go\"    data <- paste0(code_, \" 0 \", text_, \"\\n\")    pxlib$write_fd(as.integer(3), data)})\nAn irrecoverable exception occurred. R is aborting now ...\n",
  "error": {
    "message": "R session crashed with exit code -11"
  }
}

It enters an endless loop and ends up flooding my CPU.

Steps to reproduce

1. Install VS Code and the vcsode-r and vscode-r-lsp extensions
2. Open a new folder in VS Code
3. Open an R console and attach the vcode-r package
4. run renv::init() followed by install.packages("languageserver")
5. restart R

This happens both with radian and R as consoles.

System information

VS Code

Version: 1.56.2
Commit: 054a9295330880ed74ceaedda236253b4f39a335
Date: 2021-05-12T16:45:26.313Z
Electron: 12.0.4
Chrome: 89.0.4389.114
Node.js: 14.16.0
V8: 8.9.255.24-electron.0
OS: Linux x64 5.12.8-300.fc34.x86_64

sessionInfo()

R version 4.0.5 (2021-03-31)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: Fedora 34 (Workstation Edition)

Matrix products: default
BLAS/LAPACK: /usr/lib64/libflexiblas.so.3.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=sv_SE.UTF-8        LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=sv_SE.UTF-8       LC_NAME=C                  LC_ADDRESS=C               LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices datasets  utils     methods   base     

loaded via a namespace (and not attached):
[1] compiler_4.0.5 tools_4.0.5    jsonlite_1.7.2 rlang_0.4.11   renv_0.13.2 

Start by reproducing the reported sequence with VS Code, vscode-R, vscode-r-lsp, renv::init(), and languageserver on the listed R and Fedora versions. Use the segfault trace around tools:callr and pxlib$write_fd as the starting point. Done means the R session no longer crashes or enters the reported CPU-flooding loop, with a regression check for this setup.