Hi Giacinto,
    0  0x0000563b1842b735 in call_watches
(atom=atom@entry=0x563b1a3f07d0,
cond=cond@entry=OFONO_ATOM_WATCH_CONDITION_UNREGISTERED) at
src/modem.c:265
    1  0x0000563b1842c32e in __ofono_atom_unregister
(atom=atom@entry=0x563b1a3f07d0) at src/modem.c:299
    2  0x0000563b1842c3ff in __ofono_atom_unregister
(atom=0x563b1a3f07d0) at src/modem.c:296
    3  flush_atoms (modem=0x563b1a3f1f50,
new_state=MODEM_STATE_POWER_OFF) at src/modem.c:448
    4  modem_change_state (modem=0x563b1a3f1f50,
new_state=MODEM_STATE_POWER_OFF) at src/modem.c:529
    5  0x0000563b1842c577 in set_powered
(modem=modem@entry=0x563b1a3f1f50, powered=powered@entry=0) at
src/modem.c:915
    6  0x0000563b1842c863 in modem_unregister
(modem=modem@entry=0x563b1a3f1f50) at src/modem.c:2111
    7  0x0000563b1842e6a4 in ofono_modem_remove (modem=0x563b1a3f1f50)
at src/modem.c:2177
    8  0x0000563b183b05d3 in destroy_modem (data=0x563b1a3e50a0) at
plugins/udevng.c:1408
    9  0x00007f42b4bdd091 in ?? () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
    10 0x0000563b183b561a in remove_device (device=0x563b1a401630) at
plugins/udevng.c:1468
    11 udev_event (channel=<optimized out>, cond=<optimized out>,
user_data=<optimized out>) at plugins/udevng.c:1991
    12 0x00007f42b4bef0f5 in g_main_context_dispatch () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
    13 0x00007f42b4bef4c0 in ?? () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
    14 0x00007f42b4bef7d2 in g_main_loop_run () from
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
    15 0x0000563b183b0397 in main (argc=<optimized out>,
argv=<optimized out>) at src/main.c:294

?

Yes, much better.  So now you can explain to me how you're triggering this.

The only way modem->atom_watches is NULL is if ofono_modem_register failed. So are you trying to use a modem object without registering it properly?

Regards,
-Denis

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