[op25-dev] memory error turns weird

Matt D md123 at nycap.rr.com
Wed Oct 23 13:46:08 UTC 2013


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hello,

has anyone seen this error??? :

*** glibc detected *** /usr/bin/python: free(): invalid pointer:
0xaea02a58 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb75a7ee2]
/usr/lib/i386-linux-gnu/libstdc++.so.6(_ZdlPv+0x1f)[0xb69a6adf]
/usr/lib/i386-linux-gnu/libstdc++.so.6(_ZNSs4_Rep10_M_destroyERKSaIcE+0x1b)[0xb6a0e7bb]
/usr/lib/i386-linux-gnu/libstdc++.so.6(+0xb0800)[0xb6a0e800]
/usr/lib/i386-linux-gnu/libstdc++.so.6(_ZNSsD1Ev+0x2e)[0xb6a0e86e]
/usr/local/lib/python2.7/dist-packages/gnuradio/_op25.so(_ZN19snapshot_du_handler6handleEN5boost10shared_ptrI9data_unitEE+0x2a6)[0xb2d79e56]
/usr/local/lib/python2.7/dist-packages/gnuradio/_op25.so(_ZN17data_unit_handler6handleEN5boost10shared_ptrI9data_unitEE+0x54)[0xb2d78c74]
/usr/local/lib/python2.7/dist-packages/gnuradio/_op25.so(_ZN16voice_du_handler6handleEN5boost10shared_ptrI9data_unitEE+0x66)[0xb2d7b116]
/usr/local/lib/python2.7/dist-packages/gnuradio/_op25.so(_ZN15op25_decoder_bf14receive_symbolEh+0x18c)[0xb2d92bec]

my guess is the memory mix up is happening here:

void
snapshot_du_handler::handle(data_unit_sptr du)
{
   if(d_msgq) {
      string snapshot(du->snapshot());
      if(snapshot.size() > 0) {
         const size_t snapshot_sz = snapshot.size() + 1;
         gr_message_sptr msg = gr_make_message(/*type*/0,
/*arg1*/++d_data_units, /*arg2*/0, snapshot_sz);
         char *snapshot_data = reinterpret_cast<char*>(msg->msg());
         memcpy(snapshot_data, snapshot.c_str(), snapshot_sz);
         d_msgq->handle(msg);
      }
   }
   data_unit_handler::handle(du);
}

but wait the issue gets more interesting than 'du' pointing to an
invalid location:

to try to see if i could stop op25 from giving this dying error, i
commented out all of the snaphot()s in the hdu, ldu1, ldu2, and tdu.
but i am still getting all of the pickled data in the python UI.

¿¿ WTH ??!!  can someone please explain to me what i am missing here?
- -- 
- ------
Matt D
- ------------
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