[Bug 272403] panic: vm_page_assert_xbusied: page 0xfffffe0016a13728 busy_lock 0xfffffffe not owned by me @ /usr/src/sys/vm/vm_page.c:1183

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272403

--- Comment #2 from Graham Perrin <grahamperrin@freebsd.org> ---
% bectl list -c creation | grep cd9da8d072e4
n263900-cd9da8d072e4-a -      -          39.9M 2023-07-02 03:06
n263900-cd9da8d072e4-b -      -          102M  2023-07-03 16:46
n263900-cd9da8d072e4-c -      -          17.5M 2023-07-03 19:23
n263900-cd9da8d072e4-d -      -          432G  2023-07-05 01:07
n263900-cd9da8d072e4-e NR     /          1.93G 2023-07-06 14:11
% pkg iinfo drm | grep kmod
drm-510-kmod-5.10.163_7
% sudo bectl mount n263900-cd9da8d072e4-d
grahamperrin's password:
Successfully mounted n263900-cd9da8d072e4-d at /tmp/be_mount.1TMv
% pkg -r /tmp/be_mount.1TMv iinfo drm | grep kmod
drm-515-kmod-5.15.25_3
% sudo bectl umount n263900-cd9da8d072e4-d
% 


Notes to self: 

* n263900-cd9da8d072e4-d was a failed attempt to use drm-515-kmod

* n263900-cd9da8d072e4-c was temporarily active at the time of the crash, 
  chosen through the boot loader menu, I should place a hold on one of its
  snapshots (in case I need to boot the environment for this bug report)

* n263900-cd9da8d072e4-e was created whilst using n263900-cd9da8d072e4-c, 
  packages upgraded in -e then I activated -e and used Control-Alt-Delete 
  for the logout greeter in (outdated) plasma5-plasma-workspace-5.27.5_1
  to intiate the restart.

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