Hello ZeroMQ Devs,
I'm currently running into an issue with ZMQ, using CLRZMQ (Win7, VS2010),
where it is crashing in the encoder::get_data function at this line:
memcpy (buffer + pos, write_pos, to_copy);
The variable write_pos would equal 0xfeeefeee, which according to what I've
researched, means that the pointer was last touched by Window's HeapFree
function [1]. Looking into the code I've found that this variable is set with
the address from the msg_content_t::*data variable. This is then cleaned up in
zmq_msg_close:
if (content->ffn)
content->ffn (content->data, content->hint);
free (content);
I've attempted to add a function call in zmq::encoder_t::message_ready to a
function called zmq_CheckForFreedData to try and fix the problem.
bool zmq_CheckForFreedData(zmq_msg_t *msg_)
{
if (msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
return false;
if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER)
return false;
if(((zmq::msg_content_t*) msg_->content)->data == (void *)0xfeeefeee)
{
return true;
}
return false;
}
...
if (!source || !source->read (&in_progress))
{
zmq_msg_init (&in_progress);
return false;
}
else if(zmq_CheckForFreedData(&in_progress))
{
zmq_msg_init (&in_progress);
return false;
}
...
While this prevents the crash I'm now seeing my program lock up. At the moment
I don't have a simple test program for you, however, until I have the chance to
put one together, what would be the best place to start looking for why this
error is happening in the code?
Thank you,
Aaron
1.
http://stackoverflow.com/questions/127386/in-visual-studio-c-what-are-the-memory-allocation-representations
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