I came across this bug when using the Unison file synchroniser. I have been able to reproduce it reliably as follows: Simply open a directory with Thunar and then execute the following shell fragment inside the same directory:

# while true ; do touch a ; mv a b ; rm b ; done

The Thunar window will become unresponsive almost immediately.

I can confirm that the above mentioned patch from Xfce upstream does indeed fix the issue. The patch already seems to have been rolled out in Ubuntu.
<https://launchpadlibrarian.net/321070348/02_fix-deadlock-in-mutex-causing-thunar-to-hang.patch>

I would strongly recommend applying this patch in the next stable point release of Debian - it has a major effect on usability of the Xfce desktop.

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