I have tried it two ways: 1) calling stop() wait() on the top_block 2) having a block return WORK_DONE to the scheduler to stop the flowgraph
Both ways result in segfaults. I'll try calling stop() on the USRP block directly. I am currently running the 3.9.2 release but will update when I get a chance. Thanks On Thu, Mar 24, 2016 at 10:34 PM, Martin Braun <[email protected]> wrote: > Oh, I see -- you're calling stop() on the top_block, or the usrp block? > I know we fixed a segfault issue in > 4ae7a6015ba719a4720f61cc6f3857de2ebda89f (the praise goes to Marcus > Müller for the fix), but this is not on maint, only on master. What are > you running? > > Cheers, > Martin > > On 03/24/2016 05:25 PM, Jacob Gilbert wrote: > > Sorry for not being explicit, I am doing this using GR (stock gr-uhd). > > > > Jacob > > > > On Thu, Mar 24, 2016 at 5:22 PM, Martin Braun via USRP-users > > <[email protected] <mailto:[email protected]>> wrote: > > > > Jacob, > > > > are you using GNU Radio or straight UHD? Your email seems to imply > the > > former, but I want to confirm. > > > > Your backtrace looks familiar; in benchmark_rate we used to sometimes > > run into cases where we'd segfault and then they might look like > this. > > The reason was we were shutting down stuff out of order. > > > > If you have your custom app, make sure the streamer is stopped, then > > flushed, then destroyed before the multi_usrp object is destroyed. > > If you don't do that, the recv thread might be trying to access > samples > > for which there are no more valid buffers. The converter would be the > > first to see this => matches your bt. > > > > Cheers, > > Martin > > > > > > On 03/24/2016 06:54 AM, Jacob Gilbert via USRP-users wrote: > > > I have a flowgraph that requires stopping and starting to > reconfigure > > > its output, and have run into two different segfaults originating > from > > > within UHD. > > > > > > Starting and stopping is done based on user input and by either > > issuing > > > the stop() wait() sequence, or by having a block return "WORK_DONE" > > > (-1). Both have been shown to produce both types of segfault, > however > > > the WORK_DONE method anecdotally appears to be less frequent. The > > errors > > > always occur while waiting for the wait() function to return and > > > occasionally hang for an extremely long time before actually > throwing > > > sigsev. > > > > > > BT's of the segfaults are here: > > > > > > ------------ > > > > > > Program received signal SIGSEGV, Segmentation fault. > > > [Switching to Thread 0x7f8704fe9700 (LWP 103995)] > > > 0x00007f87b25589d0 in > > > > > > uhd::transport::sph::recv_packet_handler::converter_thread_task(unsigned > > > long) () from /usr/local/lib/libuhd.so.003 > > > (gdb) i trace > > > No tracepoints. > > > (gdb) bt > > > #0 0x00007f87b25589d0 in > > > > > > uhd::transport::sph::recv_packet_handler::converter_thread_task(unsigned > > > long) () from /usr/local/lib/libuhd.so.003 > > > #1 0x00007f87b26e8433 in > > task_impl::task_loop(boost::function<void ()> > > > const&) () > > > from /usr/local/lib/libuhd.so.003 > > > #2 0x00007f87be684e7a in ?? () from > > > /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.55.0 > > > #3 0x00007f87d2831182 in start_thread (arg=0x7f8704fe9700) at > > > pthread_create.c:312 > > > #4 0x00007f87d255e47d in clone () at > > > ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 > > > > > > ------------ > > > > > > Program received signal SIGSEGV, Segmentation fault. > > > [Switching to Thread 0x7fce1cff9700 (LWP 112591)] > > > 0x00007fcebb8e0b83 in > > > > > > > __convert_sc16_item32_be_1_fc32_1_PRIORITY_SIMD::operator()(uhd::ref_vector<void > > > const*> const&, uhd::ref_vector<void*> const&, unsigned long) () > from > > > /usr/local/lib/libuhd.so.003 > > > (gdb) bt > > > #0 0x00007fcebb8e0b83 in > > > > > > > __convert_sc16_item32_be_1_fc32_1_PRIORITY_SIMD::operator()(uhd::ref_vector<void > > > const*> const&, uhd::ref_vector<void*> const&, unsigned long) () > from > > > /usr/local/lib/libuhd.so.003 > > > #1 0x00007fcebbb33ad9 in > > > > > > uhd::transport::sph::recv_packet_handler::converter_thread_task(unsigned > > > long) () from /usr/local/lib/libuhd.so.003 > > > #2 0x00007fcebbcc3433 in > > task_impl::task_loop(boost::function<void ()> > > > const&) > > > () from /usr/local/lib/libuhd.so.003 > > > #3 0x00007fcec7c5fe7a in ?? () > > > from /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.55.0 > > > #4 0x00007fcedbe0c182 in start_thread (arg=0x7fce1cff9700) > > > at pthread_create.c:312 > > > #5 0x00007fcedbb3947d in clone () > > > at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111 > > > (gdb) > > > > > > ------------ > > > > > > System Details: > > > OS: Ubuntu 14.04-3 > > > UHD 3.9.2 > > > GNU Radio: 3.7.9.1 > > > > > > Thanks, > > > Jacob > > > > > > > > > > > > _______________________________________________ > > > USRP-users mailing list > > > [email protected] <mailto:[email protected]> > > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > > > > > _______________________________________________ > > USRP-users mailing list > > [email protected] <mailto:[email protected]> > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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