Segmentation Fault

[Corey Miller]

Hi, I don't know if anyone else has had this issue recently, roughly a month ago I had no issues, GQRX ran like a breeze, until today.
For some reason no matter what I do, gqrx will not start. Running gqrx from terminal spits "Segmentation Fault" and nothing more.
gdb gqrx provides nothing useful. "no debug symbols".
What can I do? Why is this happening all of a sudden?

Linux Mint 17.3 (Ubuntu 14.04)

[Alexandru Csete]

Which version of gqrx are you using and how was it installed?

Do the command line tools for whatever device you are using still work?

Alex

[Corey Miller]

All of my commands work fine, the only thing not working is gqrx.
I'm using the latest build.
2.5.3-gqrx1~trusty

I've been playing with dependencies and I've been able to get one more line to show up when starting gqrx.

By making a link to libgnuradio-osmosdr.so.0.1.15git for the 0.1.4 and 0.0.0 versions in my library path, the new string shows up.
Still segfaults, but there's this at the top now.

linux; GNU C++ version 4.8.4; Boost_105400; UHD_003.009.004-release

Segmentation fault

[Corey Miller]

Oh, and it's installed through apt with the ppa list from gqrx.dk
It was working solid a month ago, and for some reason today isn't. I've tried completely removing, re-installing, running a version I compiled from github a while back, even restarting multiple times.
To no avail.

[Corey Miller]

rtl_fm works, and I used dump1090 just to test and it is working without a hitch.

[Alexandru Csete]

Maybe one of the dependency libraries got overwritten by a package
from another repository or by a source build. The fact that gqrx
crashes before it even manages to print anything suggests that
something explodes already while the libraries are loaded.

If you build gqrx from source you can enable debug with
-DCMAKE_BUILD_TYPE=debug or -DCMAKE_BUILD_TYPE=relwithdebinfo and then
gdb may give you a hint where it crashes, if the crash occurs in gqrx.

Alex

On Wed, Jun 1, 2016 at 4:10 PM, Corey Miller <coreym...@gmail.com> wrote:
> rtl_fm works, and I used dump1090 just to test and it is working without a
> hitch.
>

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[Alexandru Csete]

On Wed, Jun 1, 2016 at 9:34 PM, Corey Miller <coreym...@gmail.com> wrote:
>> After some toying I've was able to get this from gdb.
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xb795c239 in pmt::string_to_symbol(std::string const&) ()
> from /usr/lib/i386-linux-gnu/libgnuradio-pmt.so.3.7.2.1

So, you have GNU Radio 3.7.2.1 from the official Ubuntu repository
installed in addition to the PPA.

Try uninstalling all packages with gnuradio in their name with version
other than 3.7.9

Alex

[Corey Miller]

gqrx: error while loading shared libraries: libgnuradio-analog.so.3.7.2.1: cannot open shared object file: No such file or directory

The end result thusfar. 

[Alexandru Csete]

Huh??? I thought you were using gqrx from the PPA, which uses GNU
Radio 3.7.9 so it makes no sense.

Alex

[Corey Miller]

I've discovered something strange but was able to solve it. The gqrx executable was remaining installed, so even after apt-get purge gqrx gqrx-sdr

There was still an executable to run, I've removed the executable and installed gqrx-sdr from the updated ppa and now it's perfectly fine!
Quite strange.

[Alexandru Csete]

Ok, glad it works :-)

Alex

[Aliaksandr Makarevich]

How did you manage to find executable? I can't find it, but the story with hanging repeats after installation.

[Robin Gape]

Try:
which gqrx (or similar)
the return is the path (in $PATH) to the executable, if the executable exists in the path.

For libraries, locate may be useful.

Robin, G8DQX