[Bug 224009] Kernel panic after failed attempt to mount locked sdcard.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224009

            Bug ID: 224009
           Summary: Kernel panic after failed attempt to mount locked
                    sdcard.
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: peter.henderson at ieee.org

Created attachment 188444
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188444&action=edit
core.txt.1

After using a locked sdcard, mounted ro, I unmounted it and inadvertently
attempted to mount it rw.  There was a message to the effect that this wasn't
allowed.  When I removed the sdcard, there was a kernel panic.

The sdcard reader is on my Dell monitor.

Output of uname -a:
FreeBSD hydrogen 11.0-RELEASE-p16 FreeBSD 11.0-RELEASE-p16 #0 r326382: Thu Nov
30 22:26:02 AEDT 2017     root at hydrogen:/usr/obj/usr/src/sys/GENERIC  amd64

Entries in fstab:
/dev/da1s1              /sdcard         msdosfs rw,noauto       0       0
/dev/da1s1              /sdcard-locked  msdosfs ro,noauto       0       0

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