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Message #00922
[Bug 2110040] Update Released
The verification of the Stable Release Update for dbus-broker has
completed successfully and the package is now being released to
-updates. Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report. In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.
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https://bugs.launchpad.net/bugs/2110040
Title:
dbus-broker: fix compatibility with newer kernel's error code for
SO_PEERPIDFD error case
Status in dbus-broker package in Ubuntu:
Fix Released
Status in dbus-broker source package in Noble:
Fix Committed
Status in dbus-broker source package in Oracular:
Fix Released
Status in dbus-broker source package in Plucky:
Fix Released
Status in dbus-broker source package in Questing:
Fix Released
Bug description:
[Original Description/Impact]
dbus-broker in noble, oracular and plucky only checks for EINVAL when
calling the SO_PEERPIDFD getsockopt to check if a process already
exited.
The kernel in 6.16 is changing the return value from EINVAL to ESRCH so
that the particular case can be distinguished from generic errors:
https://lore.kernel.org/all/20250411-work-pidfs-
enoent-v2-2-60b2d3bb545f@xxxxxxxxxx/
The upstream main branch of dbus-broker has a fix for this:
https://github.com/bus1/dbus-
broker/commit/4b1d9da51dc2703b7596243cb555a689bb27b4c1
Without this fix, running a new kernel with the old dbus-broker won't
be able to detect this failure mode anymore, and dbus-broker will stop
working in case that happens, as it has been reported at:
https://lore.kernel.org/all/20250415223454.GA1852104@ax162/
Backporting this back to noble/oracular/plucky will ensure that users
running with a new kernel (e.g.: HWE, local backport) won't face this
issue.
[Test Plan]
Build and install the patched dbus-broker in a container and check
that it doesn't break:
Noble:
root@localhost:/tmp# apt install ./dbus-broker_35-2ubuntu0.1_amd64.deb
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'dbus-broker' instead of './dbus-broker_35-2ubuntu0.1_amd64.deb'
The following NEW packages will be installed:
dbus-broker
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/169 kB of archives.
After this operation, 430 kB of additional disk space will be used.
Get:1 /tmp/dbus-broker_35-2ubuntu0.1_amd64.deb dbus-broker amd64 35-2ubuntu0.1 [169 kB]
Selecting previously unselected package dbus-broker.
(Reading database ... 27500 files and directories currently installed.)
Preparing to unpack .../dbus-broker_35-2ubuntu0.1_amd64.deb ...
Unpacking dbus-broker (35-2ubuntu0.1) ...
Setting up dbus-broker (35-2ubuntu0.1) ...
Replacing the running dbus-daemon with dbus-broker requires a reboot:
please reboot the system when convenient.
Created symlink /etc/systemd/user/dbus.service → /usr/lib/systemd/user/dbus-broker.service.
Created symlink /etc/systemd/system/dbus.service → /usr/lib/systemd/system/dbus-broker.service.
Processing triggers for man-db (2.12.0-4build2) ...
Processing triggers for systemd (255.4-1ubuntu8) ...
root@localhost:/tmp# systemctl daemon-reload
root@localhost:/tmp# systemctl restart dbus-broker
root@localhost:/tmp# systemctl status dbus-broker
● dbus-broker.service - D-Bus System Message Bus
Loaded: loaded (/usr/lib/systemd/system/dbus-broker.service; enabled; preset: enabled)
Active: active (running) since Tue 2025-05-06 15:00:08 BST; 3s ago
TriggeredBy: ● dbus.socket
Docs: man:dbus-broker-launch(1)
Main PID: 2458 (dbus-broker-lau)
Tasks: 2 (limit: 66786)
Memory: 1.3M (peak: 2.1M)
CPU: 10ms
CGroup: /system.slice/dbus-broker.service
├─2458 /usr/bin/dbus-broker-launch --scope system --audit
└─2459 dbus-broker --log 4 --controller 9 --machine-id b70250626e354e8481fe3ed01e2a769f --max-bytes 5368>
May 06 15:00:08 localhost systemd[1]: Starting dbus-broker.service - D-Bus System Message Bus...
May 06 15:00:08 localhost dbus-broker-launch[2458]: Kernel is missing AppArmor DBus support.
May 06 15:00:08 localhost systemd[1]: Started dbus-broker.service - D-Bus System Message Bus.
May 06 15:00:08 localhost dbus-broker-launch[2458]: Ready
root@localhost:/tmp# cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo
Plucky:
root@localhost:/tmp# apt install ./dbus-broker_36-1ubuntu0.1_amd64.deb
Note, selecting 'dbus-broker' instead of './dbus-broker_36-1ubuntu0.1_amd64.deb'
The following packages were automatically installed and are no longer required:
icu-devtools libpython3.12t64 libxenmisc4.19 linux-tools-6.12.0-15
libicu-dev libunwind8 linux-tools-6.11.0-8 linux-tools-6.12.0-15-generic
libicu76 libxenmisc4.17t64 linux-tools-6.11.0-8-generic
Use 'apt autoremove' to remove them.
Installing:
dbus-broker
Summary:
Upgrading: 0, Installing: 1, Removing: 0, Not Upgrading: 0
Download size: 0 B / 186 kB
Space needed: 475 kB / 14.5 GB available
Get:1 /tmp/dbus-broker_36-1ubuntu0.1_amd64.deb dbus-broker amd64 36-1ubuntu0.1 [186 kB]
Selecting previously unselected package dbus-broker.
(Reading database ... 35589 files and directories currently installed.)
Preparing to unpack .../dbus-broker_36-1ubuntu0.1_amd64.deb ...
Unpacking dbus-broker (36-1ubuntu0.1) ...
Setting up dbus-broker (36-1ubuntu0.1) ...
Replacing the running dbus-daemon with dbus-broker requires a reboot:
please reboot the system when convenient.
Created symlink '/etc/systemd/user/dbus.service' → '/usr/lib/systemd/user/dbus-broker.service'.
Created symlink '/etc/systemd/system/dbus.service' → '/usr/lib/systemd/system/dbus-broker.service'.
Processing triggers for man-db (2.13.0-1) ...
Processing triggers for systemd (257.4-1ubuntu3) ...
root@localhost:/tmp# systemctl daemon-reload
root@localhost:/tmp# systemctl restart dbus-broker
root@localhost:/tmp# systemctl status dbus-broker
● dbus-broker.service - D-Bus System Message Bus
Loaded: loaded (/usr/lib/systemd/system/dbus-broker.service; enabled; preset: enabled)
Active: active (running) since Tue 2025-05-06 15:02:31 BST; 2s ago
Invocation: f56d62e8fbef494bb7648f951f327d53
TriggeredBy: ● dbus.socket
Docs: man:dbus-broker-launch(1)
Main PID: 2449 (dbus-broker-lau)
Tasks: 2 (limit: 66786)
Memory: 1.3M (peak: 1.9M)
CPU: 14ms
CGroup: /system.slice/dbus-broker.service
├─2449 /usr/bin/dbus-broker-launch --scope system --audit
└─2450 dbus-broker --log 4 --controller 9 --machine-id c88acd22b631411c9e1d2467add01ca4 --max-bytes 5368>
May 06 15:02:31 localhost systemd[1]: Starting dbus-broker.service - D-Bus System Message Bus...
May 06 15:02:31 localhost dbus-broker-launch[2449]: Kernel is missing AppArmor DBus support.
May 06 15:02:31 localhost systemd[1]: Started dbus-broker.service - D-Bus System Message Bus.
May 06 15:02:31 localhost dbus-broker-launch[2449]: Ready
root@localhost:/tmp# cat /etc/os-release
PRETTY_NAME="Ubuntu 25.04"
NAME="Ubuntu"
VERSION_ID="25.04"
VERSION="25.04 (Plucky Puffin)"
VERSION_CODENAME=plucky
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
UBUNTU_CODENAME=plucky
LOGO=ubuntu-logo
Oracular:
root@localhost:/tmp# apt install ./dbus-broker_36-1ubuntu0.1_amd64.deb
Note, selecting 'dbus-broker' instead of './dbus-broker_36-1ubuntu0.1_amd64.deb'
Installing:
dbus-broker
Summary:
Upgrading: 0, Installing: 1, Removing: 0, Not Upgrading: 0
Download size: 0 B / 164 kB
Space needed: 422 kB / 14.5 GB available
Get:1 /tmp/dbus-broker_36-1ubuntu0.1_amd64.deb dbus-broker amd64 36-1ubuntu0.1 [164 kB]
Selecting previously unselected package dbus-broker.
(Reading database ... 26354 files and directories currently installed.)
Preparing to unpack .../dbus-broker_36-1ubuntu0.1_amd64.deb ...
Unpacking dbus-broker (36-1ubuntu0.1) ...
Setting up dbus-broker (36-1ubuntu0.1) ...
Replacing the running dbus-daemon with dbus-broker requires a reboot:
please reboot the system when convenient.
Created symlink '/etc/systemd/user/dbus.service' → '/usr/lib/systemd/user/dbus-broker.service'.
Created symlink '/etc/systemd/system/dbus.service' → '/usr/lib/systemd/system/dbus-broker.service'.
Processing triggers for man-db (2.12.1-3) ...
Processing triggers for systemd (256.5-2ubuntu3) ...
root@localhost:/tmp# systemctl daemon-reload
root@localhost:/tmp# systemctl restart dbus-broker
root@localhost:/tmp# systemctl status dbus-broker
● dbus-broker.service - D-Bus System Message Bus
Loaded: loaded (/usr/lib/systemd/system/dbus-broker.service; enabled; preset: enabled)
Active: active (running) since Tue 2025-05-06 15:05:32 BST; 2s ago
Invocation: 438703731d2a488bb4db9031f50906fd
TriggeredBy: ● dbus.socket
Docs: man:dbus-broker-launch(1)
Main PID: 3099 (dbus-broker-lau)
Tasks: 2 (limit: 66786)
Memory: 1.2M (peak: 1.9M)
CPU: 15ms
CGroup: /system.slice/dbus-broker.service
├─3099 /usr/bin/dbus-broker-launch --scope system --audit
└─3100 dbus-broker --log 4 --controller 9 --machine-id 6d2f232cba464e4d9af4ba93985aa438 --max-bytes 5368>
May 06 15:05:32 localhost systemd[1]: Starting dbus-broker.service - D-Bus System Message Bus...
May 06 15:05:32 localhost dbus-broker-launch[3099]: Kernel is missing AppArmor DBus support.
May 06 15:05:32 localhost systemd[1]: Started dbus-broker.service - D-Bus System Message Bus.
May 06 15:05:32 localhost dbus-broker-launch[3099]: Ready
root@localhost:/tmp# cat /etc/os-release
PRETTY_NAME="Ubuntu 24.10"
NAME="Ubuntu"
VERSION_ID="24.10"
VERSION="24.10 (Oracular Oriole)"
VERSION_CODENAME=oracular
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/";
SUPPORT_URL="https://help.ubuntu.com/";
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/";
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy";
UBUNTU_CODENAME=oracular
LOGO=ubuntu-logo
[Where problems could occur]
The updated logic adds a new expected error code from the SO_PEERPIDFD
getsockopt invocation. An issue here would affect the ability of dbus-
broker to get pidfds from clients, which would cause systemd and other
clients to fall back to pid-based tracking of requests.
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