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[Bug 2126790] [NEW] q-dhcp process is not gracefully shutting down

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Michael Johnson <2126790@xxxxxxxxxxxxxxxxxx>
Date: Fri, 03 Oct 2025 17:45:08 -0000
Reply-to: Bug 2126790 <2126790@xxxxxxxxxxxxxxxxxx>
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Public bug reported:

neutron git SHA: 783ce1cd4d99ca20fb705d6540fbce5865fe07d7
devstack git SHA: a3e37c86cab4ec43a4a6d1c1386abf12bc034db7

On devstack, the devstack@q-dhcp.service process is not gracefully
shutting down, causing a five minute delay in running clean.sh.

>From the systemd system log:

Oct 03 17:29:09 octaviaflam systemd[1]: Stopping devstack@q-dhcp.service - Devstack devstack@q-dhcp.service...
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: State 'stop-sigterm' timed out. Killing.
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Killing process 1087363 (neutron-dhcp-ag) with signal SIGKILL.
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Main process exited, code=killed, status=9/KILL
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Failed with result 'timeout'.
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Unit process 1087863 (dnsmasq) remains running after unit stopped.
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Unit process 1087867 (dnsmasq) remains running after unit stopped.
Oct 03 17:34:09 octaviaflam systemd[1]: Stopped devstack@q-dhcp.service - Devstack devstack@q-dhcp.service.
Oct 03 17:34:09 octaviaflam systemd[1]: devstack@q-dhcp.service: Consumed 4min 24.000s CPU time, 544.9M memory peak, 0B memory swap peak.

Reproduce:
1. Stack a devstack instance
2. Run "clean.sh" for devstack
3. Run "journalctl --system | grep "q-dhcp"

Expected Result:
q-dhcp should gracefully shutdown on receiving a SIGTERM from systemd

Actual Result:
The shutdown process is delayed for five minutes until the SIGTERM timeout expires at which point systemd issues a SIGKILL

** Affects: neutron
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/2126790

Title:
q-dhcp process is not gracefully shutting down

Status in neutron:
New

Bug description:
neutron git SHA: 783ce1cd4d99ca20fb705d6540fbce5865fe07d7
devstack git SHA: a3e37c86cab4ec43a4a6d1c1386abf12bc034db7

On devstack, the devstack@q-dhcp.service process is not gracefully
shutting down, causing a five minute delay in running clean.sh.

From the systemd system log:

Reproduce:
1. Stack a devstack instance
2. Run "clean.sh" for devstack
3. Run "journalctl --system | grep "q-dhcp"

Expected Result:
q-dhcp should gracefully shutdown on receiving a SIGTERM from systemd

Actual Result:
The shutdown process is delayed for five minutes until the SIGTERM timeout expires at which point systemd issues a SIGKILL

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