Created attachment 115706 [details]
Log file of modem manager (slightly anonymized)

When testing the version 1.4.6 of modem manager I had one occurrence of the problem that the modem was not disconnected when a connecting bearer was deleted from a D-Bus client.

Here is an excerpt from the modem manager logs (also attached):

<debug> [1428916367.541269] New MBM bearer created at DBus path '/org/freedesktop/ModemManager1/Bearer/7'
<debug> [1428916367.543275] Connecting bearer '/org/freedesktop/ModemManager1/Bearer/7'
<info>  [1428916367.543292] Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
...
<debug> [1428916372.035067] (wwan0): port now connected
<debug> [1428916372.035073] Connected bearer '/org/freedesktop/ModemManager1/Bearer/7'
<info>  [1428916372.035137] Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
<debug> [1428916372.035331] (wwan0): port now disconnected
<debug> [1428916372.035337] Removing from DBus bearer at '/org/freedesktop/ModemManager1/Bearer/7'

However, the modem never leaves the connected state.

In the D-Bus the following changes were visible:

- DeleteBearer was called
- Bearer has changed, deletion of Bearer/7 confirmed
- Modem still in STATE_CONNECTING

Before DeleteBearer no explicit Disconnect was issued on the Bearer interface because the bearer was still in the connecting phase.

Versions:

modemmanager: 1.4.6
libmbim: 1.12.2
libqmi: 1.12.4

Hardware:

Lenovo T440p
Modem Lenovo N5321 gw (idVendor=8087, idProduct=07dc)

Kernel: 3.18.9 with Grsecurity Patch