[Bug 214809] devd slows down the full system since upgrade from 10.3 RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214809

            Bug ID: 214809
           Summary: devd slows down the full system since upgrade from
                    10.3 RELEASE
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: clebig at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 177360
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177360&action=edit
devd -d text output

Dear all,

I'm experiencing a problem with devd since I have upgraded my system from
FreeBSD 10.3 RELEASE to FreeBSD 11.0-RELEASE-p3.

The machine is an old Dual-Core AMD Opteron(tm) Processor 1214 Hammer 2.2 Ghz,
4 GB of RAM and a ZFS rootfs.

During the boot, the system becomes extremely slow as soon as init starts devd.

After the boot, killing devd doesn't help, the system is still slow.

When shutdown -r now is entered, the system remain slow until the machine
reset.

Tests done :
I deactivated devd in /etc/rc.conf and the system is booting and working
normally.

As soon as I start devd manually, the system becomes slow.
If I start devd -d, devd does not end of seg fault, it stays blocked on
"Popping table" after an event is detected on ums0 mouse kernel module. 
If devd is interrupted or killed, the system remains slow.

If I boot on kernel.old (from 10.3 RELEASE), the system boots normaly and is
working flawlessly.

Booting on the new kernel having deactivated the ums module doesn't change the
devd behavior, it is still slowing down the entire system as soon it is
started.

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