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Re: [Discuss-gnuradio] ValueError: itemsize mismatch crash

From: vipinsharma
Subject: Re: [Discuss-gnuradio] ValueError: itemsize mismatch crash
Date: Wed, 2 Aug 2017 22:50:33 -0700

Is there any thing I can check to resolve this issue?




Sent from Mail for Windows 10


From: Vipin Sharma
Sent: Saturday, July 29, 2017 10:13 PM
To: GNURadio Discussion List
Subject: ValueError: itemsize mismatch crash




I have a few custom blocks in C in the top level GRC system. Everything seems to work fine up until the Play button. The top_block.py Python program seems to crash on this error.


At first glance, it seems to say that A1SystemControl's 4th output has size of 49 while the connected input port of ChannelEstimator has the size of 0. 


I have checked this multiple types. Both are declared correctly, "byte" type in my xml file. I also checked the lib/*.cc files for these custom blocks and verified that the io_signature::make call correctly defines the size as 'sizeof(char)' for those corresponding IOs. I have no idea from where GRC is using the number 49 and 0. Can anybody help? The "make test" step runs fine as well.


Here the related code in lib/A1Sy*.cc. You can see that iosOut has the 4th element (starting from 0 on the leftmost element) has sizeof(char):

    static int ios[] = {sizeof(gr_complex), sizeof(gr_complex), sizeof(gr_complex), sizeof(gr_complex), sizeof(gr_complex), sizeof(char)};

    static std::vector<int> iosig(ios, ios+sizeof(ios)/sizeof(int));

    static int iosOut[] = {sizeof(gr_complex), sizeof(gr_complex), sizeof(gr_complex), sizeof(gr_complex), sizeof(char), sizeof(char), sizeof(char), sizeof(char)};

    static std::vector<int> iosigOut(iosOut, iosOut+sizeof(iosOut)/sizeof(int));

    A1SystemControl_impl::A1SystemControl_impl(float frame_size, float tap_size, float est_sample_size)

      : gr::block("A1SystemControl",

        gr::io_signature::makev(6, 6, iosig),

        gr::io_signature::makev(8, 8, iosigOut)),






Also, for lib/Chan*.cc, the 0'th input has sizeof(char) as well:

    static int ios[] = {sizeof(char), sizeof(gr_complex), sizeof(gr_complex), sizeof(char)};

    static std::vector<int> iosig(ios, ios+sizeof(ios)/sizeof(int));

     ChannelEstimator_ff_impl::ChannelEstimator_ff_impl(float tap_size, float est_sample_size)

      : gr::block("ChannelEstimator_ff",

        gr::io_signature::makev(4, 4, iosig), 

        gr::io_signature::make(1, 1, sizeof(gr_complex))),







Traceback (most recent call last):

  File "/home/vipin/a1/grcnew/gr-a1System/top_block.py", line 174, in <module>


  File "/home/vipin/a1/grcnew/gr-a1System/top_block.py", line 162, in main

    tb = top_block_cls()

  File "/home/vipin/a1/grcnew/gr-a1System/top_block.py", line 113, in __init__

    self.connect((self.a1System_A1SystemControl_0, 4), (self.a1System_ChannelEstimator_ff_0, 0))

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py", line 47, in wrapped

    func(self, src, src_port, dst, dst_port)

  File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/hier_block2.py", line 110, in connect


  File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/runtime_swig.py", line 5334, in primitive_connect

    return _runtime_swig.top_block_sptr_primitive_connect(self, *args)

ValueError: itemsize mismatch: A1SystemControl0:4 using 49, ChannelEstimator_ff0:0 using 34948032

*** Error in `/usr/bin/python2': free(): invalid pointer: 0x0000000002154e58 ***

======= Backtrace: =========




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