# Segfault **URL:** \ **Category:** GNU Radio\ **Created:** [November 29, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/segfault/233270 "2014-11-29T19:36:51Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [November 29, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/segfault/233270/1 "2014-11-29T19:36:51Z")
Hi to all. This is my first post here…i hope to have choosen the right place to ask… I’m currently trying to compile gqrx and gnuradio…everything went well, but when i run gqrx it won’t start and give me this error: gqrx[5865]: segfault at 12d0 ip 00007f570ee76d2f sp 00007fff60fd9000 error 4 in libgnuradio-pmt-3.7.6git.so.0.0.0[7f570ee44000+50000] I’ve asked on the gqrx group and the author (hi csete!!!) told me that most probably it’s a bug/problem on gnuradio. I’ve no idea what’s wrong… PS: it was running ok before i updated with git pull gnuradio (didn’t do that since 2 months…). PSS: Sorry for my english!!! ---
**Author:** ![michele](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@michele](https://www.ruby-forum.com/u/michele)\ **Post date:** [November 30, 2014, 9:17pm UTC](https://www.ruby-forum.com/t/segfault/233270/2 "2014-11-30T21:17:45Z")
Hi Michele, if you built GNU Radio/gqrx with gcc, then the GNU Debugger might be of immensive help. First make sure you’ve built GNU Radio with debugging symbols (“cmake -DCMAKE\_BUILD\_TYPE=RelWithDebInfo […]”), then start gqrx in the debugger: ?\> gdb $(which gqrx) [lots of text from gdb] (gdb) run [] should start gqrx and run until it segfaults. then use the backtrace command in gdb: (gdb) bt [] which should show you in which function call hierarchy the fault occurred. Greetings, Marcus PS: don’t worry about your English, it’s quite fine 🙂 ---
**Author:** ![michele](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@michele](https://www.ruby-forum.com/u/michele)\ **Post date:** [December 1, 2014, 2:14pm UTC](https://www.ruby-forum.com/t/segfault/233270/3 "2014-12-01T14:14:41Z")
Il Sun, 30 Nov 2014 21:16:12 +0100, Marcus Müller ha scritto: > (gdb) run [] > Marcus > > > gqrx[5865]: segfault at 12d0 ip 00007f570ee76d2f sp 00007fff60fd9000 > > > > PSS: Sorry for my english!!! > > > > * * * > > > > Discuss-gnuradio mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) the project uses qmake instead of cmake…but i’ve tryed anyway… i get this from dbg: Starting program: /home/michele/Scrivania/gqrx.git/build/gqrx [Thread debugging using libthread\_db enabled] Using host libthread\_db library “/lib/x86\_64-linux-gnu/libthread\_db.so.1”. Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from / usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 (gdb) bt #0 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from /usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #1 0x00007ffff6002079 in pmt::intern(std::string const&) () from /usr/ local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #2 0x00007fffee193a0d in ?? () from /usr/lib/x86\_64-linux-gnu/libgnuradio- blocks.so.3.7.3 #3 0x00007ffff7dea13a in call\_init (l=, argc=argc@entry=1, argv=argv@entry=0x7fffffffe078, env=env@entry=0x7fffffffe088) at dl- init.c:78 #4 0x00007ffff7dea223 in call\_init (env=, argv=, argc=, l=) at dl-init.c:36 #5 \_dl\_init (main\_map=0x7ffff7ffe1c8, argc=1, argv=0x7fffffffe078, env=0x7fffffffe088) at dl-init.c:126 #6 0x00007ffff7ddb24a in \_dl\_start\_user () from /lib64/ld-linux- x86-64.so.2 #7 0x0000000000000001 in ?? () #8 0x00007fffffffe38c in ?? () #9 0x0000000000000000 in ?? () Is this what you meant? ---
**Author:** ![michele](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@michele](https://www.ruby-forum.com/u/michele)\ **Post date:** [December 1, 2014, 3:02pm UTC](https://www.ruby-forum.com/t/segfault/233270/4 "2014-12-01T15:02:01Z")
> Is this what you meant? > Exactly! So let’s have a look at the backtrace: Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from / usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 (gdb) bt #0 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from /usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #1 0x00007ffff6002079 in pmt::intern(std::string const&) () from /usr/ local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #2 0x00007fffee193a0d in ?? () from /usr/lib/x86\_64-linux-gnu/libgnuradio- blocks.so.3.7.3 There’s one problem I see here: libgnuradio-blocks has version 3.7.3 and libgnuradio-pmt 3.7.6. This means you’re mixing versions! It’s still a funny point to segfault, but you’ll have to make sure not to mix 3.7.3 and 3.7.6. From the way things are named (pmt-3.7.6git.so.0.0.0 vs blocks.so.3.7.3) I’d assume that you have one installation of GNU Radio that you’ve built yourself, and one that you installed via your distribution’s package manager, maybe? Greetings, Marcus ---
**Author:** ![michele](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@michele](https://www.ruby-forum.com/u/michele)\ **Post date:** [December 1, 2014, 8:52pm UTC](https://www.ruby-forum.com/t/segfault/233270/5 "2014-12-01T20:52:36Z")
THANKS!!! Yes…i did have 2 installations…removed the ones from package manager did the trick! ---
**Author:** ![michele](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ed8c4c/32.png) [@michele](https://www.ruby-forum.com/u/michele)\ **Post date:** [December 1, 2014, 2:55pm UTC](https://www.ruby-forum.com/t/segfault/233270/6 "2014-12-01T14:55:20Z")
Hi Michele - It looks like there are multiple GNU Radio installs being caught in the execution: /usr/local/lib/ and /usr/lib/x86\_64-linux-gnu/ : {{{ Program received signal SIGSEGV, Segmentation fault. 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from / usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 (gdb) bt #0 0x00007ffff6001d2f in pmt::string\_to\_symbol(std::string const&) () from /usr/local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #1 0x00007ffff6002079 in pmt::intern(std::string const&) () from /usr/ local/lib/libgnuradio-pmt-3.7.6git.so.0.0.0 #2 0x00007fffee193a0d in ?? () from /usr/lib/x86\_64-linux-gnu/libgnuradio- blocks.so.3.7.3 }}} On Mac OS X this dual-linkage -could- cause issues depending on the library linkage (flat or 2-level namespace; but, it likely would anyway); I assume the same on Linux. I’d suggest limiting the number of GR installs to just 1, and/or just making sure that any dependency is linked to all of the correct GR libraries (those from the same install). Good luck! - MLD