[Bug 295453] loading virtio_p9fs driver, then mounting a directory then calling kldunload causes kernel panic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295453

            Bug ID: 295453
           Summary: loading virtio_p9fs driver, then mounting a directory
                    then calling kldunload causes kernel panic
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: njain15@protonmail.com

Created attachment 270961
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=270961&action=edit
Suggested fix

using:

FreeBSD 16.0-CURRENT (src c028080749c09e68c555155df0e9f681ba63c6ae)

To reproduce:

# kldload virtio_p9fs
# mount -t p9fs sharename /mnt_dir
# kldunload virtio_p9fs

On 14.4-rel and 15.0-rel this causes a panic immediately. In current, the P9
device is detached but a panic occurs on reboot.

Suggested fix is to return EBUSY to prevent unloading until umount is called
(or shutdown).

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