I realise that shiny and Rstudio is often seen as OT here but I have a
strong suspicion that the issue is R or R/OS related so I hope someone
here will have some thoughts that might help me.
The scenario is that as of yesterday running my shiny project locally
from within Rtudio, i.e. by opening the index.html with preview, gets me
"Input/output error" when I click on a link to an app.
The same shiny running on my server (https://shiny.psyctc.org) runs
fine. So if I click on the link
https://shiny.psyctc.org/apps/COREpapers1 there then that app runs
fine. However, when I do the same locally I get "Input/output error" in
the window that pops up where the app should run! Very bizarrely, if I
open the app itself locally in Rstudio it runs fine.
I am completely baffled by this, have never seen it before and some
searching on the web only suggest that "Input/output error" may be an OS
level error and a suggestion that dmesg may give me a clue about it.
However,dmesg is showing nothing that looks remotely pertinent and
nothing new appears in rerunning dmesg immediately after invoking that
error message. I have updated and rebooted the local machine (rather
desperate I admit) and that did update quite a lot of core linux files
(despite my having updated this morning say six hours ago) ... but
nothing new in R or R packages and the problem stayed the same.
To make it even more confusing the server and the local machine are both
running R 4.5.0 (2025-04-11) and shiny version is 1.10.0 on both. I use
git to package the server project and that gets transferred to the
server from the local machine and commit is showing no local changes and
the last change is showing as on 5.v.25. The project can be seen at
https://github.com/cpsyctc/shiny-server.
The server is running
Debian 5.10.197-1 (2023-09-29) x86_64 GNU/Linux
but the local machine runs
Linux tuxedo-os 6.11.0-114025-tuxedo #25~24.04.1tux1 SMP PREEMPT_DYNAMIC
I would hugely appreciate it if anyone has any thoughts about this, any
things I might do to debug it more. It's currently getting in the way of
some mildly urgent work I need to do on the server (of course it is, IT
knows when you are vulnerable!)
TIA,
Chris
--
Chris Evans (he/him)
Visiting Professor, UDLA, Quito, Ecuador
CORE site: http://www.coresystemtrust.org.uk
<https://www.coresystemtrust.org.uk/>
Other work web site: https://www.psyctc.org/psyctc/
Personal site: https://www.psyctc.org/pelerinage2016/
<https://ombook.psyctc.org/book>
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