It appears Red Hat fixed this problem with a kernel patch in RHEL 7.5 that was not upstreamed.
https://access.redhat.com/errata/RHSA-2018:1062 BZ - 1471875 - soft lockups during unmount when dentry cache is very large https://bugzilla.redhat.com/show_bug.cgi?id=1471875 ** Bug watch added: Red Hat Bugzilla #1471875 https://bugzilla.redhat.com/show_bug.cgi?id=1471875 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1852001 Title: KDE GUI freeze on high disk IO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1852001/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
