5 Mar
2014
5 Mar
'14
5:40 a.m.
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A new Flyspray task has been opened. Details are below.
User who did this - Vitaliy Aleksandrov (Vitaliy)
Attached to Project - sip-router
Summary - Crash in websocket module
Task Type - Bug Report
Category - Module
Status - Unconfirmed
Assigned To -
Operating System - All
Severity - Medium
Priority - Normal
Reported Version - 4.1
Due in Version - Undecided
Due Date - Undecided
Details - Latest kamailio 4.1 has a problem very similar to the one described in the
FS#364.
In very rare situation kamailio tries to make double free for wsc structure.
core:
<code>
#0 0x00007f18704da425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f18704ddb8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x0000000000557c02 in qm_free (qm=0x7f185e6ae000, p=0x7f185f04d700,
file=0x7f1868a6a637 "websocket: ws_conn.c", func=0x7f1868a6aed9
"_wsconn_rm", line=140) at mem/q_malloc.c:470
#3 0x00007f1868a5b139 in _wsconn_rm (wsc=0x7f185f04d700) at ws_conn.c:140
#4 0x00007f1868a5c0e1 in wsconn_rm (wsc=0x7f185f04d700,
run_event_route=WSCONN_EVENTROUTE_YES) at ws_conn.c:310
#5 0x00007f1868a5f264 in encode_and_send_ws_frame (frame=0x7ffffdf56160,
conn_close=CONN_CLOSE_DONT) at ws_frame.c:303
#6 0x00007f1868a63336 in ws_frame_transmit (data=0x7ffffdf56230) at ws_frame.c:709
#7 0x000000000045933c in sr_event_exec (type=11, data=0x7ffffdf56230) at events.c:260
</code>
logs:
<code>
kamailio[21357]: INFO: <script>: [HTTP] WebSocket connection closed [X.X.X.X:63514].
[X.X.X.X] => [0]
kamailio[21360]: ERROR: websocket [ws_frame.c:294]: encode_and_send_ws_frame():
tcp_send_fail on wsc: 0x7f185f04d700
kamailio[21360]: ERROR: websocket [ws_frame.c:296]: encode_and_send_ws_frame(): sending
WebSocket frame
kamailio[21360]: INFO: <script>: [HTTP] WebSocket connection closed [X.X.X.X:63514].
[X.X.X.X] => [-1]
kamailio[21360]: : <core> [mem/q_malloc.c:468]: qm_free(): BUG: qm_free: freeing
already freed pointer (0x7f185f04d700), called from websocket: ws_conn.c: _wsconn_rm(140),
first free websocket: ws_conn.c: _wsconn_rm(140) - aborting
</code>
As shown above event_route was called twice and a counter for the connection got
"-1".
This is a very rare situation and it only happens in the next scenario:
0. User A (connected via websocket) established a conversation with user B (tcp/tls).
TCP worker process 1 handles websocket connection to the A and tcp process 2 handles
connection to the B.
1. User A sends BYE to B. Kamailio forwards BYE to B.
2.1. User A closes websocket connection before receiving 200 OK to the BYE request.
2.2. User B replies with 200 OK to the BYE.
3. Kamailio calls ws_frame_transmit() for "200 OK" and ws_frame_received() for
"WS CLOSE" in different TCP workers.
They both take wsc pointer by calling wscconn_get() and at the end to processes tries to
call ws_conn_rm() for
the same WSC connection which leads to double shm_free().
At now i'm trying to add reference counts to wsc in the same way they work in
tcp_connection structure.
Maybe somebody has a better idea how to fix this ?
More information can be found at the following URL:
http://sip-router.org/tracker/index.php?do=details&task_id=406
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