Segfault when using repeated curl::send_mail() within Github Actions

[ummel]

This is probably not the appropriate place to report this issue, but I'm not sure where else to ask.

I am running a simple R script in Github Actions that uses a for() loop at the end to send a series of emails via curl::send_mail().

The script executes without issue on my local machine. When called within a Github Actions workflow, it successfully sends the first email in the for() loop and then fails on the second call to curl::send_mail() and reports the following segfault error:

*** caught segfault ***
address (nil), cause 'unknown'

Traceback:
 1: curl_fetch_memory(smtp_server, handle = h)
 2: curl::send_mail(mail_from = unname(from), mail_rcpt = unname(c(to,     cc, bcc)), message = email_qp, smtp_server = paste0(credentials$host,     ":", credentials$port), use_ssl = credentials$use_ssl %||%     TRUE, verbose = verbose, username = credentials$user, password = credentials$password,     login_options = login_options, ...)
 3: smtp_send(email = m, ...)
 4: eval(ei, envir)
 5: eval(ei, envir)
 6: withVisible(eval(ei, envir))
 7: source("news_summarizer.R")
An irrecoverable exception occurred. R is aborting now ...
/home/runner/work/_temp/293d5b38-2844-48a5-80b9-9c7e930667f2.sh: line 1:  6438 Segmentation fault      (core dumped) Rscript -e 'source("news_summarizer.R")'
Error: Process completed with exit code 139.

I don't think there is anything wrong with my workflow .yaml file, which is pretty straightforward:

on:
  push:
    branches: main

jobs:
  summarize-news:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v4
      
      - name: Set up R
        uses: r-lib/actions/setup-r@v2  # See here: https://github.com/r-lib/actions
        
      - name: Install packages
        uses: r-lib/actions/setup-r-dependencies@v2
        with:
          packages: |
            any::googlesheets4
            any::dplyr
            any::rvest
            any::stringr
            any::ellmer
            any::jsonlite
            any::blastula

      - name: Run script
        run: Rscript -e 'source("news_summarizer.R")'

Does anyone have any ideas about what might cause this? It appears the issue is specific to the GitHub Actions environment. Thanks!