Re: [Discuss-gnuradio] Unhandled exception after upgrading gnuradio- bac

On Sat, Mar 10, 2012 at 5:20 AM, MOHD RAFIQ <address@hidden> wrote:

Hi,
pls suggest fix for this, i have attached my cat /proc/cpuinfo .
Thanks

I already did. To quote:

"Ok, I have a branch 'volk_32bit_fixes' published at:

This should fix the fft_filter issue and another issue in one of the volk convert functions (that is not used in GNU Radio but was failing anyway).

I'm still seeing the 32fc_x2_dot_product_32fc failure. It looks like this is in the SSE_32 proto-kernel. I'm seeing if we can get a quick fix for it. This is the same problem Martin was seeing. If we can't get a fix for it, I'm going to temporarily disable it until we get it fixed.

Tom"

I have been waiting for people with 32-bit machines to try it out and report back before merging it.

Tom

From: MOHD RAFIQ <address@hidden>
To: "address@hidden" <address@hidden>
Sent: Thursday, 8 March 2012 9:45 PM
Subject: Re: [Discuss-gnuradio] Unhandled exception after upgrading gnuradio- backtrace included

I apologise for not being clear, here is the backtrace

[New Thread 0xb21feb70 (LWP 16921)]
[Thread 0xb19fdb70 (LWP 16920) exited]
[New Thread 0xb19fdb70 (LWP 16922)]
[New Thread 0xb29ffb70 (LWP 16923)]
[New Thread 0xb33ffb70 (LWP 16924)]
[New Thread 0xb3dffb70 (LWP 16925)]
[New Thread 0xb51ffb70 (LWP 16926)]
[New Thread 0xb47ffb70 (LWP 16927)]
[New Thread 0xb11fcb70 (LWP 16928)]
[New Thread 0xb09fbb70 (LWP 16929)]
[New Thread 0xb01fab70 (LWP 16930)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb29ffb70 (LWP 16923)]
0x002fc4a0 in volk_32fc_x2_multiply_32fc_a_sse3 ()
   from /usr/local/lib/libvolk.so.0.0.0
(gdb) bt
#0 0x002fc4a0 in volk_32fc_x2_multiply_32fc_a_sse3 ()
   from /usr/local/lib/libvolk.so.0.0.0
#1 0x002c25d2 in get_volk_32fc_x2_multiply_32fc_a ()
   from /usr/local/lib/libvolk.so.0.0.0
#2 0x005125bf in gri_fft_filter_ccc_generic::filter(int, std::complex<float> const*, std::complex<float>*) ()
   from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#3 0x005196ff in gr_fft_filter_ccc::work(int, std::vector<void const*, std::allocator<void const*> >&, std::vector<void*, std::allocator<void*> >&) ()
   from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#4 0x004e537a in gr_sync_decimator::general_work(int, std::vector<int, std::allocator<int> >&, std::vector<void const*, std::allocator<void const*> >&, std::vector<void*, std::allocator<void*> >&) ()
   from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#5 0x004c983c in gr_block_executor::run_one_iteration() ()
   from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#6 0x004e7a7f in gr_tpb_thread_body::gr_tpb_thread_body(boost::shared_ptr<gr_block>, int) () from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#7 0x004e2374 in boost::detail::function::void_function_obj_invoker0<gruel::thread_body_wrapper<tpb_container>, void>::invoke(boost::detail::function::function_buffer&) () from /usr/local/lib/libgnuradio-core-3.5.3git.so.0.0.0
#8 0x006c8156 in boost::detail::thread_data<boost::function0<void> >::run() ()
   from /usr/local/lib/libgruel-3.5.3git.so.0.0.0
#9 0x0017444d in thread_proxy () from /usr/lib/libboost_thread-mt.so.1.46.0
#10 0x4f94ca2e in start_thread () from /lib/libpthread.so.0
#11 0x4f86689e in clone () from /lib/libc.so.6

Thanks,
rafiq

From: Tom Rondeau <address@hidden>
To: MOHD RAFIQ <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Thursday, 8 March 2012 8:51 PM
Subject: Re: [Discuss-gnuradio] Unhandled exception after upgrading gnuradio

On Thu, Mar 8, 2012 at 5:40 AM, MOHD RAFIQ <address@hidden> wrote:

Hi,
   I am using benchmark_tx.py and benchmark_rx.py in code to make WBX usrp2 as transceiver, this was running without error until I upgraded my gnuradio from 3.5.1 to current version

v3.5.2-1-g57ad294b, when I run the same code now it gives a segmenatation fault(core dump), below are the /var/log/messages when seg. fault occurs

Mar 8 15:29:10 MRAFIQ-NGN kernel: [75426.998302] python[12650] general protection ip:b2d4a0 sp:b51fee80 error:0 in libvolk.so.0.0.0[ae2000+be000]
Mar 8 15:29:11 MRAFIQ-NGN abrt[12658]: saved core dump of pid 12635 (/usr/bin/python) to /var/spool/abrt/ccpp-2012-03-08-15:29:10-12635.new/coredump (127561728 bytes)
Mar 8 15:29:11 MRAFIQ-NGN abrtd: Directory 'ccpp-2012-03-08-15:29:10-12635' creation detected
Mar 8 15:29:11 MRAFIQ-NGN abrtd: Interpreter crashed, but no packaged script detected: 'python algo-sink.py'
Mar 8 15:29:11 MRAFIQ-NGN abrtd: Corrupted or bad dump /var/spool/abrt/ccpp-2012-03-08-15:29:10-12635 (res:2), deleting

In the code this occurs at tb.start() inside benchmark_rx.py

and it works without an error after a 6-8 trials in a row ,
I am not able to figure out where there is exception that is not handled properly, I appreciate your comments.

fedora 15, gnuradio v3.5.2-1-g57ad294b,
usrp2, WBX daughter board

Can you follow the instructions here:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-do-I-debug-GNU-Radio-in-Python

And get us a backtrace (bt in gdb) when the seg fault happens? It'll help us to debug it.

Thanks,
Tom

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From:	Tom Rondeau
Subject:	Re: [Discuss-gnuradio] Unhandled exception after upgrading gnuradio- backtrace included
Date:	Sat, 10 Mar 2012 07:38:52 -0500