memory corrupted?

Hi @achaloyan ,
I meet a question, which may be memory corruption. I debug as these:

and texts:

(gdb) bt
#0  synth_state_update (base=<optimized out>, message=0x7fe5b40182f8) at src/mrcp_synth_state_machine.c:570
#1  0x00007fe5db3a53ed in mrcp_server_msg_process (task=0xa5f318, msg=0x7fe5c00008c0) at src/mrcp_server.c:840
#2  0x00007fe5db3c144a in apt_task_msg_process (task=0xa5f318, msg=0x7fe5c00008c0) at src/apt_task.c:347
#3  0x00007fe5db3c183a in apt_consumer_task_run (task=<optimized out>) at src/apt_consumer_task.c:145
#4  0x00007fe5db3c0a20 in apt_task_run (thread_handle=0xa746a0, data=0xa5f318) at src/apt_task.c:594
#5  0x00007fe5da11dea5 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fe5d9b448dd in ioperm () from /lib64/libc.so.6
#7  0x0000000000000000 in ?? ()
(gdb) p *message
$11 = {start_line = {message_type = MRCP_MESSAGE_TYPE_RESPONSE, version = MRCP_VERSION_2, length = 0, request_id = 1454635, method_name = {buf = 0x7fe5b4065730 "SPEAK", length = 4}, method_id = 3, status_code = MRCP_STATUS_CODE_SUCCESS, 
    request_state = MRCP_REQUEST_STATE_COMPLETE}, channel_id = {session_id = {buf = 0x7fe5b40657f0 "", length = 16}, resource_name = {buf = 0xa6d650 "speechsynth", length = 11}}, header = {generic_header_accessor = {data = 0x7fe5b40184e0, vtable = 0x7fe5db5db7e0 <vtable>}, 
    resource_header_accessor = {data = 0x7fe5b40185d8, vtable = 0x7fe5db5dba20 <vtable>}, header_section = {ring = {next = 0x7fe5b4018370, prev = 0x7fe5b4018370}, arr = 0x7fe5b40183b0, arr_size = 38}}, body = {buf = 0x0, length = 0}, resource = 0xa6d610, pool = 0x7fe5b4018278}

As you see :

session_id is empty, which should't occur;
method_name is "SPEAK", but method_id is "3", however the correctly method_id of "SPEAK" is 2, the method_id of "STOP" is 3, as in

unimrcp/libs/mrcp/resources/include/mrcp_synth_resource.h

Line 33 in 7c8703d

SYNTHESIZER_SPEAK,

My veriosn is:

unimrcp: 1.5
tts plugin: demo-synth by your implement

And I add some logs to debug(print the pointer address of message and pool),

/** Process STOP request */
static apt_bool_t demo_synth_channel_stop(mrcp_engine_channel_t *channel, mrcp_message_t *request, mrcp_message_t *response)
{
	demo_synth_channel_t *synth_channel = channel->method_obj;
	/* store the request, make sure there is no more activity and only then send the response */
	synth_channel->stop_response = response;
	apt_log(APT_LOG_MARK, APT_PRIO_INFO, "demo_synth_channel_stop %s, %s, %0x, %0x", synth_channel->stop_response->channel_id.session_id.buf, synth_channel->stop_response->start_line.method_name.buf, synth_channel->stop_response, synth_channel->stop_response->pool);
	return TRUE;
}

/** Callback is called from MPF engine context to read/get new frame */
static apt_bool_t demo_synth_stream_read(mpf_audio_stream_t *stream, mpf_frame_t *frame)
{
	demo_synth_channel_t *synth_channel = stream->obj;
	/* check if STOP was requested */
	if(synth_channel->stop_response) {
		apt_log(APT_LOG_MARK, APT_PRIO_INFO, "Request Stop Response, %s, %s, %0x, %0x", synth_channel->stop_response->channel_id.session_id.buf, synth_channel->stop_response->start_line.method_name.buf, synth_channel->stop_response, synth_channel->stop_response->pool);
......

So the ouput is :

2021-07-20 18:25:20:116614 src/mrcp_server_connection.c:811 140625060026112 [INFO]   Receive MRCPv2 Data 10.233.135.12:1544 <-> 10.233.129.106:37889 [77 bytes]
MRCP/2.0 77 STOP 1454635
Channel-Identifier:38ba5092e94411eb@speechsynth

2021-07-20 18:25:20:116694 src/apt_task.c:264 140625060026112 [INFO]   Signal Message to [MRCP Server] [0x7fe5c40008e0;2;3]
2021-07-20 18:25:20:116755 src/mrcp_server_session.c:575 140625171441408 [INFO]   Dispatch Signaling Message [1]
2021-07-20 18:25:20:116768 src/mrcp_synth_state_machine.c:485 140625171441408 [INFO]   Process STOP Request <38ba5092e94411eb@speechsynth> [1454635]
2021-07-20 18:25:20:116775 src/apt_task.c:264 140625171441408 [INFO]   Signal Message to [Demo Synth Engine] [0x7fe5d4002b30;1;0]
2021-07-20 18:25:20:116835 src/demo_synth_engine.c:352 140625160951552 [INFO]   demo_synth_channel_stop 38ba5092e94411eb, STOP, b40182f8, b4018278

2021-07-20 18:25:20:126218 src/demo_synth_engine.c:499 140625049536256 [INFO]   Request Stop Response, , SPEAK, b40182f8, b4018278
2021-07-20 18:25:20:126240 src/apt_task.c:264 140625049536256 [INFO]   Signal Message to [MRCP Server] [0x7fe5c00008c0;3;4]

It can see the address don't change, but the content of the address is changed, ag : b40182f8, b4018278.

So I guess the memory corrupted, but I can't analysis why.

Would you give me some suggests please?

Sorry, I am not able to follow you. Maybe you can use the latest version of UniMRCP such as 1.7.0.

Closing this issue for now. If you are able to reproduce the problem with the latest release, please feel free to reopen.