segmentation fault on Ubuntu 12.04

Peter A. Bigot pab at
Sun Jan 20 22:42:01 UTC 2013

As a new user of GNU radio with a couple RTL2832 dongles to play with I 
used the build-gnuradio script to install on Fedora 16 and Ubuntu 
12.04.  The Fedora install worked fine; but the Ubuntu one produced this:

lemur4[18]$ rtl_test
Found 1 device(s):
   0:  ezcap USB 2.0 DVB-T/DAB/FM dongle

Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Elonics E4000 tuner
Supported gain values (14): -1.0 1.5 4.0 6.5 9.0 11.5 14.0 16.5 19.0 
21.5 24.0 29.0 34.0 42.0
Reading samples in async mode...
cb transfer status: 1, canceling...

Library error 0, exiting...
Segmentation fault (core dumped)

The traceback showed the fault to occur in libusb1, and seemed similar 
to the issue discussed at

I noticed this patch at the head of master touched the same general part 
of the code.

commit 3cbf1392612a0c6f02ec178f8e78568138f12b0a
Author: Hoernchen <la at>
Date:   Wed Jan 16 20:03:00 2013 +0100

     exit if our usb device disappears

Reverting this change fixed the issue.


More information about the osmocom-sdr mailing list