[sr-dev] [tracker] Comment added: Crash in TCP Read on Kamailio 4.0.1

[sip-router]

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The following task has a new comment added:

FS#364 - Crash in TCP Read on Kamailio 4.0.1
User who did this - Vitaliy Aleksandrov (Vitaliy)

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With MEMDBG=1 i've got the next crash:

<code>
(gdb) bt                                                                                                                                                                                                                                     
#0  0x00007f75cd79e425 in raise () from /lib/x86_64-linux-gnu/libc.so.6                                                                                                                                                                      
#1  0x00007f75cd7a1b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6                                                                                                                                                                      
#2  0x000000000058c13f in qm_free (qm=<optimized out>, p=0x7f75bc2b20d8, file=<optimized out>, func=<optimized out>, line=<optimized out>) at mem/q_malloc.c:468                                                                             
#3  0x00007f75c5d4267e in _wsconn_rm (wsc=<optimized out>) at ws_conn.c:140                                                                                                                                                                  
#4  wsconn_rm (wsc=<optimized out>, run_event_route=<optimized out>) at ws_conn.c:311                                                                                                                                                        
#5  0x00007f75c5d448ce in encode_and_send_ws_frame (frame=<optimized out>, conn_close=<optimized out>) at ws_frame.c:298                                                                                                                     
#6  0x00007f75c5d45499 in close_connection (wsc=0x7f75bc2b20d8, type=REMOTE_CLOSE, status=<optimized out>, reason=...) at ws_frame.c:346                                                                                                     
#7  0x00007f75c5d4749f in handle_close (frame=0x7fff99ac6320) at ws_frame.c:567                                                                                                                                                              
#8  ws_frame_receive (data=<optimized out>) at ws_frame.c:656                                                                                                                                                                                
#9  0x00000000004179cc in ws_process_msg (tcpbuf=0x7f75bc939e20 "\210\202\350w\253K", <incomplete sequence \351>, len=8, rcv_info=0x7f75bc939b50, con=0x7f75bc939b38) at tcp_read.c:1146                                                     
#10 0x0000000000565092 in tcp_read_req (con=0x7f75bc939b38, bytes_read=0x7fff99ac65a0, read_flags=0x7fff99ac65b0) at tcp_read.c:1387                                                                                                         
#11 0x0000000000566676 in handle_io (fm=<optimized out>, events=<optimized out>, idx=<optimized out>) at tcp_read.c:1559                                                                                                                     
#12 0x0000000000569914 in io_wait_loop_epoll (repeat=<optimized out>, h=<optimized out>, t=<optimized out>) at io_wait.h:1092                                                                                                                
#13 tcp_receive_loop (unix_sock=<optimized out>) at tcp_read.c:1728                                                                                                                                                                          
#14 0x00000000005608bc in tcp_init_children () at tcp_main.c:4959                                                                                                                                                                            
#15 0x0000000000489855 in main_loop () at main.c:1702                                                                                                                                                                                        
#16 0x000000000041cca0 in main (argc=<optimized out>, argv=<optimized out>) at main.c:2533
</code>

Last line before crash in the kamailio.log:
<code>
Nov 28 16:51:22 localhost kamailio[2957]: INFO: <script>: [HTTP] WebSocket connection closed [x.x.x.x:64834]. [x.x.x.x] => [-1]
Nov 28 16:51:22 localhost kamailio[2957]: INFO: <core> [mem/q_malloc.c:437]: qm_free(): qm_free(0x7f75bb9a2000, 0x7f75bc2b20d8), called from websocket: ws_conn.c: _wsconn_rm(140)
<code>Nov 28 16:51:22 localhost kamailio[2957]: : <core> [mem/q_malloc.c:466]: qm_free(): BUG: qm_free: freeing already freed pointer (0x7f75bc2b20d8), called from websocket: ws_conn.c: _wsconn_rm(140), first free websocket: ws_conn.c: _wsconn_rm(140) - aborting
</code>

Connection close message is printed from event_route[websocket:closed]. Before crash it was called two times for the same connection (counter for ip:port that i have in htable showed "-1" and shm_free() called again for the same websocket connection structure).

Looks like a problem in websocket module.
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More information can be found at the following URL:
http://sip-router.org/tracker/index.php?do=details&task_id=364#comment1183

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