I don't know why, but commonmark_html() and commonmark_xml() doesn't work well on the console of RStudio Server on CentOS 7.

More precisely, if I install commonmark package 1.6 and run commonmark::markdown_html("## foo"),

• on RStudio Server 1.1.463 (stable)'s console, it crashes with segmentation fault. (Error message in syslog: kernel: rsession[93474]: segfault at 7f1792c96811 ip 00007f17a3331c97 sp 00007fff29b6f998 error 6 in libc-2.17.so[7f17a31df000+1b8000])
• on RStudio Server 1.2.1139 (preview)'s console, it returns a wrong result ("<h2></h2>\n").

Note that, it returns the correct result ("<h2>foo</h2>\n") if I run the code

• on R REPL on RStudio's terminal pane
• on R REPL on an SSH session
• with commonmark 1.5
• on RStudio Server's console on Debian

How to reproduce

1. Run CentOS Docker image

docker run -p 8787:8787 -it --rm centos:7 bash

2. Install and run RStudio Server

# Download RPM (`1.1.463` is the stable version)
curl -o rstudio.rpm https://download2.rstudio.org/rstudio-server-rhel-1.1.463-x86_64.rpm
yum install rstudio.rpm

# Add rstudio user
useradd rstudio
passwd rstudio

# Launch RStudio Server
/usr/lib/rstudio-server/bin/rserver 

3. Browse to http://localhost:8787 and login
4. Install commonmark package and run this code

commonmark::markdown_html("## foo")