** Changed in: network-manager
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1647283
Title:
WiFi being detected as ethernet when race condition on renaming for
persistent name
Status in HWE Next:
New
Status in NetworkManager:
Fix Released
Status in OEM Priority Project:
New
Status in OEM Priority Project xenial series:
New
Status in network-manager package in Ubuntu:
New
Bug description:
Forwarded https://bugzilla.gnome.org/show_bug.cgi?id=775613
Version: NetworkManager 1.4.2
This bug happens after power-on with probability about 1/50.
That means we need to reboot about 50 times to get into the buggy situation.
"nmcli d" shows the device type is ethernet:
DEVICE TYPE STATE CONNECTION
wlp1s0 ethernet unavailable --
lo loopback unmanaged --
The bug starts from a race condition. But it is not the root cause.
I've also attach 2 logs. One is in good situation. Another is in bad
situation.
This log is generated by applying a "log patch" to network-manager 1.4.2 so
we can see more stuff.
In the bad situation. The bug starts with race condition. But the race
condition is not the root cause. The race condition is:
* During the renaming from "wlan0" to "wlp1s0". "wlan0" disappeared.
* Inside the NM, it is still using "wlan0" in "_linktype_get_type()".
* Since /sys/class/net/wlan0/uevent is disappeared. so the type matching
failed in _linktype_get_type().
* Also wifi_utils_is_wifi() failed to because /sys/class/net/wlan0
disappeared.
* And finally, devtype and kind are both NULL, so it returns
NM_LINK_TYPE_ETHERNET for wlan0.
Later, wlan0 is renamed to wlp1s0, and it seems to me that the Object inherit
the type so it is still type ethernet.
But from the log, I saw _linktype_get_type() is called several times later
and return the correct type (wifi). But just, "nmcli d" still shows type
ethernet.
I'm wondering if we are missing to update the type in the Object
created after renaming and re-detecting the type.
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