[Expired for gnome-settings-daemon (Ubuntu) because there has been no
activity for 60 days.]
** Changed in: gnome-settings-daemon (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1662836
Title:
repeatedly turning BT off and off crashes gnome
Status in gnome-settings-daemon package in Ubuntu:
Expired
Bug description:
A bit of background (not sure if important): in our setup RFKill is
driving a GPIO to enable / disable the BT transceiver. This is a slow
operation and it could take ~500ms for the RFKill subsystem to
complete the operation.
In the Bluetooth configuration panel if I click on the Bluetooth
on/off toggle switch 5+ times in a row repeatedly, gnome (or BT
configuration panel) crashes.
This is what I have in the journal:
```
gnome-settings-[886]: g_simple_async_result_take_error: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_complete_in_idle: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_take_error: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_complete_in_idle: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_take_error: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_complete_in_idle: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
kernel: BT_RADIO going: on
kernel: BCM_BT: going ON
gnome-settings-[886]: g_simple_async_result_take_error: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: g_simple_async_result_complete_in_idle: assertion
'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed
gnome-settings-[886]: Failed to set RFKill: Stream has outstanding operation
gnome-settings-daemon.desktop[886]: **
gnome-settings-daemon.desktop[886]:
rfkill-plugin:ERROR:rfkill-glib.c:168:write_change_all_timeout_cb: assertion
failed: (rfkill->priv->event)
```
Coredump:
```
Core was generated by `/usr/lib/gnome-settings-daemon/gnome-settings-daemon'.
Program terminated with signal SIGABRT, Aborted.
#0 __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:44
44 ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S: No such file
or directory.
(gdb) bt
#0 __libc_do_syscall () at
../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:44
#1 0xf687bee6 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#2 0xf687cbee in __GI_abort () at abort.c:89
#3 0xf69bc7ea in g_assertion_message () from
/lib/arm-linux-gnueabihf/libglib-2.0.so.0
#4 0xf69bc888 in g_assertion_message_expr () from
/lib/arm-linux-gnueabihf/libglib-2.0.so.0
#5 0xf285d562 in write_change_all_timeout_cb (rfkill=0x643430,
rfkill@entry=0x4b3f70) at rfkill-glib.c:168
#6 0xf285dc68 in cc_rfkill_glib_send_change_all_event (rfkill=0x4b3f70,
rfkill_type=2, enable=0, cancellable=0xf285e0b8, callback=0xf285c709
<rfkill_set_cb>,
user_data=0x492b90) at rfkill-glib.c:242
#7 0xf285cf78 in engine_set_bluetooth_airplane_mode (enable=<optimized out>,
manager=0x492b90) at gsd-rfkill-manager.c:345
#8 handle_set_property (connection=<optimized out>, sender=<optimized out>,
object_path=<optimized out>, interface_name=<optimized out>,
property_name=0xf490f528 "BluetoothAirplaneMode", value=0xf4919460,
error=0xffc75dac, user_data=0x492b90) at gsd-rfkill-manager.c:395
#9 0xf6b162ea in ?? () from /lib/arm-linux-gnueabihf/libgio-2.0.so.0
```
At least for `assertion 'G_IS_SIMPLE_ASYNC_RESULT (simple)' failed`
what I think it's happening here is that
`cc_rfkill_glib_send_change_all_event()` is rapidly called and several
request for the asynchronous writing are queued on several
`GSimpleAsyncResult` objects. When the first writing is done in
`write_change_all_done_cb()` the latest `rfkill->priv->simple` object
is freed. All the subsequent `write_change_all_done_cb()` callbacks
find a NULL `rfkill->priv->simple`.
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