Package: libk5crypto3
Version: 1.18.3-6+deb11u3

# uname -a
Linux rp4 5.10.0-19-arm64 #1 SMP Debian 5.10.149-2 (2022-10-21) aarch64
GNU/Linux

The following upgrade on Raspberry Pi 4 seems to break DRM and
Xorg no longer starts on Debian 11:

/var/log/apt/history.log
Start-Date: 2022-12-05  17:06:18
Commandline: apt dist-upgrade
Upgrade: libgssapi-krb5-2:arm64 (1.18.3-6+deb11u2, 1.18.3-6+deb11u3), 
libkrb5support0:arm64 (1.18.3-6+deb11u2, 1.18.3-6+deb11u3), libkrb5-3:arm64 
(1.18.3-6+deb11u2, 1.18.3-6+deb11u3), libk5crypto3:arm64 (1.18.3-6+deb11u2, 
1.18.3-6+deb11u3), vivaldi-stable:arm64 (5.5.2805.44-1, 5.5.2805.50-1)
End-Date: 2022-12-05  17:06:37

The following new kernel errors are logged:

[   96.222828] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] 
*ERROR* [PLANE:60:plane-3] flip_done timed out
[  106.463033] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] 
*ERROR* [CRTC:64:crtc-3] flip_done timed out
[  116.703323] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] 
*ERROR* [CRTC:64:crtc-3] flip_done timed out
[  126.943416] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] 
*ERROR* [CONNECTOR:32:HDMI-A-1] flip_done timed out
[  137.183538] [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] 
*ERROR* [PLANE:60:plane-3] flip_done timed out

Downgrading the above set of packages resolves the issue:

# apt install libk5crypto3:arm64=1.18.3-6+deb11u2 
libkrb5support0:arm64=1.18.3-6+deb11u2 libkrb5-3:arm64=1.18.3-6+deb11u2 
libgssapi-krb5-2:arm64=1.18.3-6+deb11u2
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Suggested packages:
  krb5-doc krb5-user
Recommended packages:
  krb5-locales
The following packages will be DOWNGRADED:
  libgssapi-krb5-2 libk5crypto3 libkrb5-3 libkrb5support0
0 upgraded, 0 newly installed, 4 downgraded, 0 to remove and 0 not upgraded.
Need to get 681 kB of archives.
After this operation, 4,096 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://deb.debian.org/debian bullseye/main arm64 libk5crypto3 arm64 
1.18.3-6+deb11u2 [114 kB]
Get:2 http://deb.debian.org/debian bullseye/main arm64 libkrb5support0 arm64 
1.18.3-6+deb11u2 [64.9 kB]
Get:3 http://deb.debian.org/debian bullseye/main arm64 libkrb5-3 arm64 
1.18.3-6+deb11u2 [346 kB]
Get:4 http://deb.debian.org/debian bullseye/main arm64 libgssapi-krb5-2 arm64 
1.18.3-6+deb11u2 [155 kB]
Fetched 681 kB in 1s (637 kB/s)           
dpkg: warning: downgrading libk5crypto3:arm64 from 1.18.3-6+deb11u3 to 
1.18.3-6+deb11u2
(Reading database ... 166394 files and directories currently installed.)
Preparing to unpack .../libk5crypto3_1.18.3-6+deb11u2_arm64.deb ...
Unpacking libk5crypto3:arm64 (1.18.3-6+deb11u2) over (1.18.3-6+deb11u3) ...
Setting up libk5crypto3:arm64 (1.18.3-6+deb11u2) ...
dpkg: warning: downgrading libkrb5support0:arm64 from 1.18.3-6+deb11u3 to 
1.18.3-6+deb11u2
(Reading database ... 166394 files and directories currently installed.)
Preparing to unpack .../libkrb5support0_1.18.3-6+deb11u2_arm64.deb ...
Unpacking libkrb5support0:arm64 (1.18.3-6+deb11u2) over (1.18.3-6+deb11u3) ...
Setting up libkrb5support0:arm64 (1.18.3-6+deb11u2) ...
dpkg: warning: downgrading libkrb5-3:arm64 from 1.18.3-6+deb11u3 to 
1.18.3-6+deb11u2
(Reading database ... 166394 files and directories currently installed.)
Preparing to unpack .../libkrb5-3_1.18.3-6+deb11u2_arm64.deb ...
Unpacking libkrb5-3:arm64 (1.18.3-6+deb11u2) over (1.18.3-6+deb11u3) ...
Setting up libkrb5-3:arm64 (1.18.3-6+deb11u2) ...
dpkg: warning: downgrading libgssapi-krb5-2:arm64 from 1.18.3-6+deb11u3 to 
1.18.3-6+deb11u2
(Reading database ... 166394 files and directories currently installed.)
Preparing to unpack .../libgssapi-krb5-2_1.18.3-6+deb11u2_arm64.deb ...
Unpacking libgssapi-krb5-2:arm64 (1.18.3-6+deb11u2) over (1.18.3-6+deb11u3) ...
Setting up libgssapi-krb5-2:arm64 (1.18.3-6+deb11u2) ...
Processing triggers for libc-bin (2.31-13+deb11u4) ...

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