[Bug 203879] mount_smbfs panic at smbutil logout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203879

            Bug ID: 203879
           Summary: mount_smbfs panic at smbutil logout
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mwlucas at michaelwlucas.com

Created attachment 162216
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162216&action=edit
core.txt

Running today's current, the following sequence always panics the machine.

smbutil lookup fileserver
Got response from 203.0.113.77
IP address of fileserver: 203.0.113.77
storm~;smbutil login //mwlucas at fileserver
Password:
smbutil: unable to open connection: syserr = Authentication error
smbutil: could not login to server FILESERVER: syserr = Authentication error
storm~;smbutil login //mwlucas at fileserver
Password:
Connected to MWLUCAS
storm~;smbutil logout //mwlucas at fileserver

"fileserver" is a Win 7 VM, fresh install, no security updates, behind a
firewall.

/etc/nsmb.conf is:

[default]
nbns=203.0.113.77
username=mwlucas
workgroup=MWL
password=$$obfuscated

100% reproducible.

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