manpage referenced in dmesg doesn't exist

[Seth Arnold]

Hello, the focal kernel dmesg output includes references to read a manpage, but that manpage doesn't appear to be packaged:

$ apt-file search kernel_lockdown
$ man -k lockdown
lockdown: nothing appropriate.
$

$ dmesg | grep -i lockdown
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man kernel_lockdown.7
[ 0.534737] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534741] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534742] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534744] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534745] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534747] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534748] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534749] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534750] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534752] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534753] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534754] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534782] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534783] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534785] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534786] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534787] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534816] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534817] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534819] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534820] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534821] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534822] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534824] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534825] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534826] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534827] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534829] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534830] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534831] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534832] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534834] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534835] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534836] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534837] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534838] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534840] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534841] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534842] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534843] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534844] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534846] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534847] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534848] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534850] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534851] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534855] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534856] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534857] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534858] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534860] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534861] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534862] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534864] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534866] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534867] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534868] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534869] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534870] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534872] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534874] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534875] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534876] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534877] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534879] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534880] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534881] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534885] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534886] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534887] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534888] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534890] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534891] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534892] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534894] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534895] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534897] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534898] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534899] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534900] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534901] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534904] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534905] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534906] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534907] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534908] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534910] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534911] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534913] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534914] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534915] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534917] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534918] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534919] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534920] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534922] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534924] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534925] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534926] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534927] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534928] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534930] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534931] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534932] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534934] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534935] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534936] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534937] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534939] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.534942] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.535008] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.536594] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823207] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823209] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823210] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823217] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823218] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.823220] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 0.952149] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
[ 1.002371] Lockdown: swapper/0: hibernation is restricted; see man kernel_lockdown.7
[ 71.475128] Lockdown: systemd: /dev/mem,kmem,port is restricted; see man kernel_lockdown.7
[ 73.791076] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 73.793322] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 73.812049] Lockdown: rasdaemon: use of tracefs is restricted; see man kernel_lockdown.7
[ 74.166659] Lockdown: Xorg: raw io port access is restricted; see man kernel_lockdown.7
[ 76.013277] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[ 76.015903] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[ 76.016454] Lockdown: systemd-logind: hibernation is restricted; see man kernel_lockdown.7
[530336.397649] Lockdown: systemd: /dev/mem,kmem,port is restricted; see man kernel_lockdown.7

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-12-generic 5.4.0-12.15
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
Date: Thu Feb 13 00:58:36 2020
ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-5.4
UpgradeStatus: Upgraded to focal on 2020-01-24 (19 days ago)