Created attachment 139 [details]
gdb bt and logs

Hardware: 	CWAV USBee AX PRO
Driver:		fx2lafw
Software:	PulseView

Using libsigrok 0.3.0 (lib version 2:0:0).
Using libsigrokdecode 0.3.0 (lib version 2:0:0).

This segmentation fault happens when you don't notice the device is already being selected and you accidentally select it again, resulting in a segmentation fault when the 'Run'-button is being pressed.

Reproduce:

1. Connect the CWAV USBee AX PRO.
2. Open PulseView (should already see 'CWAV USBee AX' selected).
3. Scan for fx2lafw devices and select the 'CWAV USBee AX' from the device list.
	- Pop ups error message: "generic/unspecified error Failed to Select Device".
4. Press 'Run' for collecting samples.
	- Segmentation fault at this stage

If you skip step 3 (driver selection) everything works as it should, so the driver selection is not functioning properly.