[Bug 230746] Crash of system 11.2 after installed updates 2018-08-14 (Freebsd 11.2-p2)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230746

            Bug ID: 230746
           Summary: Crash of system 11.2 after installed updates
                    2018-08-14 (Freebsd 11.2-p2)
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: entombed at i.ua

Created attachment 196343
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=196343&action=edit
kernel conf file

ada0: <WDC WD5003ABYZ-011FA0 01.01S03> ATA8-ACS SATA 3.x device
CPU: Intel(R) Xeon(R) CPU E5-2609 v2 @ 2.50GHz (2500.06-MHz K8-class CPU)
avail memory = 8193228800 (7813 MB)
Mother Board: X9SRE/X9SRE-3F/X9SRi/X9SRi-3F


After you install the OS upgrade (2018-08-14 Freebsd 11.2-p2) it works for some
time.
May be works 1 hour or 10 minuts
And then stops responding. Local terminal does not work, it is not available
over the network (not responded). In /var/log/message dose not any error or
warning
Used custom kernel (attach file)
For install update use commands

# freebsd-update fetch
# freebsd-update install
# make buildkernel KERNCONF=GENERIC-20180721
# make buildkernel KERNCONF=GENERIC-20180721
# reboot

After rollback to Freebsd 11.2-p1 system works correctly

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