-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Well, after having a debug build and then adding a lot of "volatile"s into the code at the crashing function, it looks as if the d_pre_diff_code of the constellation has size 0; and thus, you can't access the 0. (read: first) element. How this could happen with a QPSK object is currently subject to my confusion. Stay tuned for more confusing facts as the code unfolds :).
Greetings, Marcus On 16.12.2013 08:30, Miklos Maroti wrote: > Hi Marcus, > > I do not think it is a compiler bug, but something uninitialized. > Constellation_qpsk and constellation_calcdist does not crash (I > did not verify if they work). However, if I generate the LUT for > constellation_qpsk, then it crashes. > > # uname -a Linux maroti-t410 3.11.0-14-generic #21-Ubuntu SMP Tue > Nov 12 17:04:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux > > # gcc --version gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1 > > Using latest master branch of gnuradio, hash 117058bac41c91, both > CMAKE_BUILD_TYPE=Debug and Release produces the same behavior > > # gdb `which python` core Reading symbols from > /usr/bin/python2.7...(no debugging symbols found)...done. > > warning: core file may not match specified executable file. [New > LWP 2249] [New LWP 2251] [New LWP 2240] [New LWP 2248] [New LWP > 2247] [New LWP 2239] [New LWP 2250] > > warning: Can't read pathname for load map: Input/output error. > [Thread debugging using libthread_db enabled] Using host > libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". > Core was generated by `python ./constellation_simulation.py'. > Program terminated with signal 11, Segmentation fault. #0 > 0x00007f98dbbe01a7 in gr::digital::constellation::calc_soft_dec ( > this=0x48321c0, sample=..., npwr=<optimized out>) at > /home/mmaroti/workspace/gnuradio/gr-digital/lib/constellation.cc:286 > > 286 for(int j = 0; j < k; j++) { > > i stack #0 0x00007f98dbbe01a7 in > gr::digital::constellation::calc_soft_dec ( this=0x48321c0, > sample=..., npwr=<optimized out>) at > /home/mmaroti/workspace/gnuradio/gr-digital/lib/constellation.cc:286 > > #1 0x00007f98dbbe0f7e in gr::digital::constellation::soft_decision_maker ( > this=0x48321c0, sample=...) at > /home/mmaroti/workspace/gnuradio/gr-digital/lib/constellation.cc:355 > > #2 0x00007f98dbbe94dc in > gr::digital::constellation_soft_decoder_cf_impl::work > (this=0x4fb11a0, noutput_items=8190, input_items=..., > output_items=...) at > /home/mmaroti/workspace/gnuradio/gr-digital/lib/constellation_soft_decoder_cf_impl.cc:68 > > #3 0x00007f98e1c5dd38 in gr::sync_interpolator::general_work ( > this=0x4fb11c0, noutput_items=<optimized out>, ninput_items=..., > input_items=..., output_items=...) at > /home/mmaroti/workspace/gnuradio/gnuradio-runtime/lib/sync_interpolator.cc:67 > > You should be able to reproduce the problem quite easily, but if > needed I can provided a test program. > > Best, Miklos > > On Mon, Dec 16, 2013 at 7:59 AM, Marcus Müller <mar...@hostalia.de> > wrote: >> Could you post the whole backtrace (as a github gist, pastebin >> etc)? That would be very helpful, along with information such >> as: Compiler (Gcc (version), VC++, clang ...), Platform (Linux, >> win, mac,...), architecture (x86(64), ARMv9, IBM S7390,...) and >> GNU Radio source version. >> >> Thanks and happy hacking, Marcus >> >> On 12/16/2013 01:05 AM, Miklos Maroti wrote: >>> >>> Hi Guys, >>> >>> Constellation soft decoder crashes for constellation_bpsk() >>> and constellation_8psk(). I could not find the cause of this >>> problem, the back trace on my machine points to >>> >>> gnuradio/gr-digital/lib/constellation.cc:286 for(int j = 0; j < >>> k; j++) { >>> >>> which does not make any sense. Any idea what could go wrong? >>> >>> Miklos >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ Discuss-gnuradio >> mailing list Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSrvNkAAoJEAFxB7BbsDrLTuIIAKGc2OjoUYgV3Lw8SuarcCjb awWSZUC+jGxiOs5meaDOcfVsR8Viv9D0G98s6Ck0U6uHkJ1GPvzLLkRbxonPEhcB syFs4Uz4nhqYddfuiNTyG4LhWXPWC3i/rm53lngIO50zBRelrGwxWIg4y5VyKwfV JZfQ3duH+4JBe81VNuUw9Cb6/xhxHORD65AhnwOQBYU4w1mIrP1kNokfsFkXK/WN e55jg+inffiRAg47Bz5wl0SsYGFrlNRNq+JnEmCMCR74c5xNE8T3ZO/NfDGxEwjl fqXhY3ZpWqcoFOnizepUs8qvdzosveaFYKF+R474IkoBGZxUMn0Q5d+GxNAhxj4= =G4mf -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio