I'm seeing the same (or at least a highly similar) problem on Ubuntu
22.10:
NetworkManager[1628]: [1718657963.8557] device (CC:21:19:DA:E8:EA):
Activation: starting connection 'Gambit Network'
(e2a0aeb8-c87f-4ac6-8972-1e0bfac16e91)
NetworkManager[1628]: [1718657963.8558] audit:
op="connection-activate" uuid="e2a0aeb8-c87f-4ac6-8972-1e0bfac16e91"
name="Gambit Network" pid=1359709 uid=1000 result="su
NetworkManager[1628]: [1718657963.8559] device (CC:21:19:DA:E8:EA):
state change: disconnected -> prepare (reason 'none', sys-iface-state:
'managed')
bluetoothd[1287905]: bnep0 connected
kernel: bluetooth hci0:256 enxc403a8869e89: renamed from bnep0 (while UP)
NetworkManager[1628]: [1718657964.0945] device (CC:21:19:DA:E8:EA):
ip-ifindex: ifname bnep0 not found
NetworkManager[1628]: [1718657964.0946] device (CC:21:19:DA:E8:EA):
Error connecting with bluez: cannot find device bnep0
NetworkManager[1628]: [1718657964.0946] device (CC:21:19:DA:E8:EA):
state change: prepare -> failed (reason 'bluetooth-failed', sys-iface-state:
'managed')
NetworkManager[1628]: [1718657964.0952] device (CC:21:19:DA:E8:EA):
Activation: failed for connection 'Gambit Network'
NetworkManager[1628]: [1718657964.0955] device (CC:21:19:DA:E8:EA):
state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
bluetoothd[1287905]: profiles/network/bnep.c:bnep_if_down() bnep: Could not
bring down bnep0: No such device(19)
This happens when NetworkManager/Modemmanager connects to my phone for
tethering via bluetooth.
This started happening somewhere in the last couple of weeks, while it
worked fine before that. However, the connection now fails most of the
the time, but if I retry a few (sometimes a dozen) times, it usually
connects eventually. So maybe there is a race condition that has been
present for a long time, but just became a lot more likely due some
(possibly otherwise unrelated) change in timing or otherwise.
Here's what it looks like when it does work:
NetworkManager[1628]: [1718658216.0757] device (CC:21:19:DA:E8:EA):
Activation: starting connection 'Gambit Network'
(e2a0aeb8-c87f-4ac6-8972-1e0bfac16e91)
NetworkManager[1628]: [1718658216.0758] audit:
op="connection-activate" uuid="e2a0aeb8-c87f-4ac6-8972-1e0bfac16e91"
name="Gambit Network" pid=1359709 uid=1000 result="s>
NetworkManager[1628]: [1718658216.0759] device (CC:21:19:DA:E8:EA):
state change: disconnected -> prepare (reason 'none', sys-iface-state:
'managed')
bluetoothd[1287905]: bnep0 connected
kernel: bluetooth hci0:256 enxc403a8869e89: renamed from bnep0 (while UP)
NetworkManager[1628]: [1718658217.3531] device (CC:21:19:DA:E8:EA):
ip-ifname: interface index 0 renamed ip_iface (15295) from 'bnep0' to
'enxc403a8869e89'
NetworkManager[1628]: [1718658217.3531] device (CC:21:19:DA:E8:EA):
state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
NetworkManager[1628]: [1718658217.3589] device (CC:21:19:DA:E8:EA):
state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
NetworkManager[1628]: [1718658217.3603] dhcp4 (enxc403a8869e89):
activation: beginning transaction (timeout in 45 seconds)
From the looks of this, it actually seems that NetworkManager sometimes
catches and sometimes misses the rename, so maybe my issue is an issue
in NetworkManager.
In any case, for anyone else that runs into something like this, as a
workaround I just disabled interface renaming in udev using the
following rule (which, by setting a NAME prevents
/usr/lib/udev/rules.d/80-net-setup-link.rules from renaming the
interface).
$ cat /etc/udev/rules.d/10-local-bluetooth-no-rename.rules
SUBSYSTEM=="net", ACTION=="add", KERNEL=="bnep0", NAME="bnep0"
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https://bugs.launchpad.net/bugs/1645257
Title:
bluetoothd does not notice udev-induced device name change
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