This may be related to https://github.com/gnuradio/gnuradio/issues/2407
Best regards Christoph On Fri, Apr 26, 2019 at 6:42 PM Marcus Müller (GNU Radio maintainer) <mmuel...@gnuradio.org> wrote: > > Hi Tom, > > shoot, that sounds like we half-fixed a bug :( > How proficient are you with GDB? Could you get a backtrace? (maybe > based on [1]?) > Thank you! > Marcus > > [1] https://wiki.gnuradio.org/index.php/TutorialsGDB > > On Fri, 2019-04-26 at 09:25 -0700, Tom McDermott wrote: > > > > I've had this problem intermittently for about a year. On starting > > the flowgraph it will terminate > > with QT Throw : Bad Alloc. Building different versions from about > > 3.7.10 ish to 3.7.latest will change > > whether or not it happens 100% of the time or 30% of the time. > > > > Today, I noticed that disabling the QT Frequency sink causes it to > > not throw, and the flowgraph runs > > fine. One input to QT Freq Sink works OK many times, two inputs > > causes it to throw virtually every > > time. > > > > After some playing around: > > If I change the initial QT Frequency sink to start with a much > > smaller FFT size (256), then it does not > > QT Throw on startup even with two channels. The original > > configuration was to start at FFT size of 1024 > > (causing throw). Setting the block to start with FFT size of 256 > > causes it not to throw. > > > > When the flowgraph starts, the QT Frequency sink does not display any > > signals. If, while running > > in GRC, I change the FFT size then suddenly the signal traces start > > displaying. Also while running > > I can then change the FFT size, and it keeps running, and the display > > shows the effect of changing > > the resolution. > > > > So I think the QT Throw problem has something to do with the starting > > FFT size, and the non-display > > seems to fix itself after changing the FFT size all related to QT > > Frequency Sink. > > > > Ubuntu 16.04, with gnuradio / GRC 3.7.13.5 > > > > -- Tom, N5EG > > > > > > > > _______________________________________________ > > 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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
