Created attachment 7271 Fix deadlock in xfconf-cache xfconf-cache uses mutex to lock cache access. This mutex may remain locked under some conditions. That's because this mutex is not released in the end of xfconf_cache_set. I'm attaching the patch which fixes this problem.
This has been addressed already in Git in commit https://git.xfce.org/xfce/xfconf/commit/?id=25088094efdba26c777d49a2bcdde98105112525 and it will be included in the next 4.13.4 release. Thanks for you report.