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#134 Switching to StVarF in lv2 crash

v2.5.4
closed-out-of-date
nobody
lv2 (4)
5
2021-06-19
2016-05-27
Xavier
No

Hi,

Loading zyn's lv2 in an ardour4 midi track, playing a loop from alsa-midi with seq24 and switching from Analog to StVarF during the play. That's killing the lv2 host.

gdb logs attached

I was unable to reproduce with standalone.

1 Attachments

Discussion

  • Mark McCurry

    Mark McCurry - 2016-05-29

    So, somehow a SV filter is getting used with an incorrect filter type which is triggering an assert of a sort. Perhaps this is a data race generated by updates taking place on running notes rather than only on new notes.

    Either way the assert is src/DSP/SVFilter.cpp:139
    I'll try to trace the path that leads to the conditions for the crash this week.
    If you need a temporary workaround replace that line with "out = &x.low;". That may result in some minor transient errors, but within a few frames everything should be corrected.

     
  • Xavier

    Xavier - 2016-05-29

    I was just playing around, no urgent needs for me. In any case, thanks a lot! Workaround works pretty well.

     
  • Mark McCurry

    Mark McCurry - 2021-06-19
    • status: open --> closed-out-of-date
     
  • Mark McCurry

    Mark McCurry - 2021-06-19

    Today we're trying to migrate old issues on the sourceforge tracker over to github. As many of the issues are rather old the assumption is most of them are out-of-date. If this issue still impacts current versions of zyn, just let us know and we'll make sure it's migrated to the newer issue tracking system.

     

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