** Description changed:
+ [Impact]
+
+ * bridge_role property setting is racy on boot
+
+ * This results in incorrect bridge mode set on the devices, sometimes,
+ which leads to lack of desired connectivity (e.g. bridging internet to
+ containers)
+
+ * The fix for this issue is to set bridge_role, only after the device
+ is online
+
+ * Unfortunately the udev rules are not regenerated, therefore affected
+ systemd must manually remove and recreate chzdev rules
+
+ [Test Case]
+
+ * Remove qeth udev rules from /etc/udev/rules.d/
+ * Enable qeth device using chzdev with a non-default bridge_role setting,
e.g.:
+ chzdev --no-root-update -pVe c003 bridge_role=primary;
+ * Reboot and check that bridge_role setting is correctly set in the sysfs,
e.g.:
+ /sys/devices/qeth/0.0.c003/bridge_role
+
+ [Regression Potential]
+
+ * Minimal, the generated udev rules remain the same; the only
+ difference in the generated udev rules is the ordering in setting the
+ bridge_role attribute
+
+ [Other Info]
+
+ * Original bug report:
+
Attempting to set bridge_role = primary with the following command in
preseed:
in-target chzdev --no-root-update -pVe c003 bridge_role=primary;
...works, and generates the following udev rule for this device:
https://pastebin.canonical.com/164271/
However, after reboot:
systemd-udevd[2634]: error opening
ATTR{/sys/devices/qeth/0.0.c003/bridge_role} for writing: Permission
denied
More logging:
https://pastebin.canonical.com/164272/
after the system has booted, we are able to write to the file and set
bridge_role to primary:
- root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
+ root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
none
root@10-13-3-10:/var/log# echo primary >
/sys/devices/qeth/0.0.c003/bridge_role
- root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
+ root@10-13-3-10:/var/log# cat /sys/devices/qeth/0.0.c003/bridge_role
primary
** Also affects: s390-tools (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Also affects: s390-tools (Ubuntu Zesty)
Importance: Undecided
Assignee: Dimitri John Ledkov (xnox)
Status: Fix Committed
** Also affects: s390-tools (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: s390-tools (Ubuntu Yakkety)
Assignee: (unassigned) => Dimitri John Ledkov (xnox)
** Changed in: s390-tools (Ubuntu Xenial)
Assignee: (unassigned) => Dimitri John Ledkov (xnox)
** Changed in: s390-tools (Ubuntu Zesty)
Milestone: None => ubuntu-17.03
** Changed in: s390-tools (Ubuntu Yakkety)
Milestone: None => yakkety-updates
** Changed in: s390-tools (Ubuntu Xenial)
Milestone: None => xenial-updates
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https://bugs.launchpad.net/bugs/1618463
Title:
udev race condition with qeth device and bridge_role
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