6 Nov
2021
6 Nov
'21
6:48 p.m.
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### Description
Found following issue when trying to solve #2895 :
<!--
Explain what you did, what you expected to happen, and what actually happened.
-->
function kazoo_query (as shown in the module's documentation) causes kamailio to
crash.
### Troubleshooting
#### Reproduction
Compile kamailio master-branch from scratch (with module "kazoo" enabled).
Modify kamailio-config with minimal settings required to use function
"kazoo_query":
```
diff /usr/local/etc/kamailio/kamailio.cfg.sample /usr/local/etc/kamailio/kamailio.cfg
496a497,501
loadmodule "kazoo.so"
modparam("kazoo", "amqp_connection",
"amqp://guest:guest@rabbitmqhost:5672")
modparam("kazoo", "node_hostname",
"sipproxy.mydomain.com")
modparam("kazoo", "pua_mode", 0)
517a523,533
xlog("SCRIPT: Snipppet from
kazoo_query-documentation:\n");
$var(amqp_payload_request) = "{'Event-Category' : 'call_event' ,
'Event-Name' : 'query_user_channels_req', 'Realm' : '" +
$fd + "', 'Username' : '" + $fU + "',
'Active-Only' : false }";
kazoo_encode("$ci", "$var(callid_encoded)");
$var(amqp_routing_key) = "call.status_req.$var(callid_encoded)";
if(kazoo_query("callevt", $var(amqp_routing_key), $var(amqp_payload_request),
"$var(amqp_result)")) {
kazoo_json("$var(amqp_result)", "Channels[0].switch_url",
"$du");
if($du != $null) {
xlog("L_INFO", "$ci|log|user channels found redirecting call to
$du");
return;
}
}
```
Start kamailio and register. Kamailio crashes when reaching kazoo_query:
```
Nov 6 16:19:37 hostname kamailio: INFO: <core> [core/tcp_main.c:4997]: init_tcp():
using epoll_lt as the io watch method (auto detected)
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: rr [../outbound/api.h:52]:
ob_load_api(): unable to import bind_ob - maybe module is not loaded
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: rr [rr_mod.c:188]: mod_init():
outbound module not available
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [main.c:3035]: main():
processes (at least): 52 - shm size: 67108864 - pkg size: 8388608
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:154]:
probe_max_receive_buffer(): SO_RCVBUF is initially 212992
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:206]:
probe_max_receive_buffer(): SO_RCVBUF is finally 425984
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:154]:
probe_max_receive_buffer(): SO_RCVBUF is initially 212992
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:206]:
probe_max_receive_buffer(): SO_RCVBUF is finally 425984
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:154]:
probe_max_receive_buffer(): SO_RCVBUF is initially 212992
Nov 6 16:19:37 hostname src/kamailio[352171]: INFO: <core> [core/udp_server.c:206]:
probe_max_receive_buffer(): SO_RCVBUF is finally 425984
Nov 6 16:19:37 hostname src/kamailio[352200]: INFO: jsonrpcs [jsonrpcs_sock.c:443]:
jsonrpc_dgram_process(): a new child 0/352200
Nov 6 16:19:37 hostname src/kamailio[352202]: INFO: ctl [io_listener.c:213]:
io_listen_loop(): io_listen_loop: using epoll_lt io watch method (config)
Nov 6 16:19:37 hostname src/kamailio[352203]: ERROR: kazoo [kz_amqp.c:2387]:
kz_amqp_consumer_event_cfg(): kazoo:consumer-event not found
Nov 6 16:19:42 hostname src/kamailio[352203]: ERROR: kazoo [kz_amqp.c:2387]:
kz_amqp_consumer_event_cfg(): kazoo:consumer-event not found
Nov 6 16:19:49 hostname src/kamailio[352213]: ERROR: {1 1 REGISTER
OUfeIVS08Xrbmw8Nr-udtg..} <script>: SCRIPT: Snipppet from
kazoo_query-documentation:
Nov 6 16:19:49 hostname src/kamailio[352221]: CRITICAL: <core>
[core/pass_fd.c:277]: receive_fd(): EOF on 72
Nov 6 16:19:49 hostname src/kamailio[352171]: ALERT: <core> [main.c:774]:
handle_sigs(): child process 352213 exited by a signal 6
Nov 6 16:19:49 hostname src/kamailio[352171]: ALERT: <core> [main.c:777]:
handle_sigs(): core was generated
Nov 6 16:19:49 hostname src/kamailio[352171]: INFO: <core> [main.c:799]:
handle_sigs(): terminating due to SIGCHLD
Nov 6 16:19:49 hostname src/kamailio[352220]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352218]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352209]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352219]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352201]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352187]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352207]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352205]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352202]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352199]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352195]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352210]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352193]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352196]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352183]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352191]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352176]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352203]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352189]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352192]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352175]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352208]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352185]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352182]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352216]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352190]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352206]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352194]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352177]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352215]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352186]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352173]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352204]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352184]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352188]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352217]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352214]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352180]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352198]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352172]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352221]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352174]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352197]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352200]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352211]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352212]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352181]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352179]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352178]: INFO: <core> [main.c:854]: sig_usr():
signal 15 received
Nov 6 16:19:49 hostname src/kamailio[352171]: INFO: <core> [core/sctp_core.c:53]:
sctp_core_destroy(): SCTP API not initialized
```
#### Debugging Data
<!--
If you got a core dump, use gdb to extract troubleshooting data - full backtrace,
local variables and the list of the code at the issue location.
gdb /path/to/kamailio /path/to/corefile
bt full
info locals
list
If you are familiar with gdb, feel free to attach more of what you consider to
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-->
backtrace with gdb shows:
```
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1 0x00007fc47407a859 in __GI_abort () at abort.c:79
#2 0x00007fc47407a729 in __assert_fail_base (fmt=0x7fc474210588 "%s%s%s:%u:
%s%sAssertion `%s' failed.\n%n",
assertion=0x7fc46f0fe2d0 "json_object_get_type(jso) == json_type_object",
file=0x7fc46f0fe044 "json_object.c", line=476, function=<optimized out>)
at assert.c:92
#3 0x00007fc47408bf36 in __GI___assert_fail (assertion=0x7fc46f0fe2d0
"json_object_get_type(jso) == json_type_object", file=0x7fc46f0fe044
"json_object.c", line=476,
function=0x7fc46f0fe280 "json_object_object_add_ex") at assert.c:101
#4 0x00007fc46f0f7d26 in json_object_object_add_ex () from
/lib/x86_64-linux-gnu/libjson-c.so.4
#5 0x00007fc46f14ebe4 in kz_amqp_add_payload_common_properties (json_obj=0x559b3c3b30c0,
server_id=0x7ffda57606f0
"kamailio(a)sipproxy.mydomain.com-<352213>-script-0";-script-0",
unique=0x7ffda5760660) at kz_amqp.c:1023
#6 0x00007fc46f1509a0 in kz_amqp_pipe_send_receive (str_exchange=0x7ffda57609c0,
str_routing_key=0x7ffda57609d0, str_payload=0x7ffda57609b0, kz_timeout=0x7ffda57609e0,
json_ret=0x7ffda5760a10) at kz_amqp.c:1159
#7 0x00007fc46f158763 in kz_amqp_query_ex (msg=0x7fc47394beb8, exchange=0x7fc4738f03d0
"(q\216s\304\177", routing_key=0x7fc4738f57c8 "0\213\207s\304\177",
payload=0x7fc4738f58d8 "hX\217s\304\177") at kz_amqp.c:1494
#8 0x00007fc46f1588b2 in kz_amqp_query (msg=0x7fc47394beb8, exchange=0x7fc4738f03d0
"(q\216s\304\177", routing_key=0x7fc4738f57c8 "0\213\207s\304\177",
payload=0x7fc4738f58d8 "hX\217s\304\177", dst=0x7fc4738f04f0
"p\004\217s\304\177") at kz_amqp.c:1517
#9 0x0000559b3b1c7355 in do_action (h=0x7ffda5761370, a=0x7fc4738f1d98,
msg=0x7fc47394beb8) at core/action.c:1151
#10 0x0000559b3b1d0463 in run_actions (h=0x7ffda5761370, a=0x7fc4738f1d98,
msg=0x7fc47394beb8) at core/action.c:1581
#11 0x0000559b3b1d0bd6 in run_actions_safe (h=0x7ffda5761f70, a=0x7fc4738f1d98,
msg=0x7fc47394beb8) at core/action.c:1645
#12 0x0000559b3b16a4b0 in rval_get_int (h=0x7ffda5761f70, msg=0x7fc47394beb8,
i=0x7ffda5761750, rv=0x7fc4738f4040, cache=0x0) at core/rvalue.c:949
#13 0x0000559b3b16fa9c in rval_expr_eval_int (h=0x7ffda5761f70, msg=0x7fc47394beb8,
res=0x7ffda5761750, rve=0x7fc4738f4038) at core/rvalue.c:1947
#14 0x0000559b3b1c0ec8 in do_action (h=0x7ffda5761f70, a=0x7fc4738f7f28,
msg=0x7fc47394beb8) at core/action.c:1052
#15 0x0000559b3b1d0463 in run_actions (h=0x7ffda5761f70, a=0x7fc4738e8ca8,
msg=0x7fc47394beb8) at core/action.c:1581
#16 0x0000559b3b1d0ce6 in run_top_route (a=0x7fc4738e8ca8, msg=0x7fc47394beb8, c=0x0) at
core/action.c:1666
#17 0x0000559b3b37f932 in receive_msg (
buf=0x559b3c3a0960 "REGISTER sip:10.0.0.24:5060;transport=TCP SIP/2.0\r\nVia:
SIP/2.0/TCP
10.0.0.33:47335;branch=z9hG4bK-524287-1---83d016a408b857dd;rport\r\nMax-Forwards:
69\r\nContact: <sip:1234@10.0.0.33:47335;rinstance=837"..., len=578,
rcv_info=0x7fc46f4c01a8) at core/receive.c:513
#18 0x0000559b3b41dfb3 in receive_tcp_msg (
tcpbuf=0x7fc46f4c0530 "REGISTER sip:10.0.0.24:5060;transport=TCP SIP/2.0\r\nVia:
SIP/2.0/TCP
10.0.0.33:47335;branch=z9hG4bK-524287-1---83d016a408b857dd;rport\r\nMax-Forwards:
70\r\nContact: <sip:1234@10.0.0.33:47335;rinstance=837"..., len=578,
rcv_info=0x7fc46f4c01a8, con=0x7fc46f4c0190) at core/tcp_read.c:1424
#19 0x0000559b3b4205f8 in tcp_read_req (con=0x7fc46f4c0190, bytes_read=0x7ffda5762618,
read_flags=0x7ffda576261c) at core/tcp_read.c:1607
#20 0x0000559b3b423af5 in handle_io (fm=0x7fc473954a08, events=1, idx=-1) at
core/tcp_read.c:1782
#21 0x0000559b3b40eccc in io_wait_loop_epoll (h=0x559b3b6f62e0 <io_w>, t=2,
repeat=0) at core/io_wait.h:1070
#22 0x0000559b3b426aa8 in tcp_receive_loop (unix_sock=75) at core/tcp_read.c:1978
#23 0x0000559b3b2a161e in tcp_init_children (woneinit=0x7ffda5762a00) at
core/tcp_main.c:5153
#24 0x0000559b3b153f0b in main_loop () at main.c:1843
#25 0x0000559b3b15e745 in main (argc=1, argv=0x7ffda57630e8) at main.c:3058
```
#### Log Messages
<!--
Check the syslog file and if there are relevant log messages printed by Kamailio, add them
next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
-->
#### SIP Traffic
<!--
If the issue is exposed by processing specific SIP messages, grab them with ngrep or save
in a pcap file, then add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
-->
```
(paste your sip traffic here)
```
### Possible Solutions
This somehow pointed me to the payload - so I tried to change the AMQP-payload in the
config to a minimalistic custom JSON document. With this config, the crash does no longer
occur:
```
diff /usr/local/etc/kamailio/kamailio.cfg /usr/local/etc/kamailio/kamailio.cfg.sample
497,501d496
< loadmodule "kazoo.so"
< modparam("kazoo", "amqp_connection",
"amqp://guest:guest@guest@rabbitmqhost:5672")
< modparam("kazoo", "node_hostname",
"sipproxy.mydomain.com")
< modparam("kazoo", "pua_mode", 0)
<
523,533d517
< xlog("SCRIPT: Snipppet from kazoo_query-documentation:\n");
< #$var(amqp_payload_request) = "{'Event-Category' : 'call_event'
, 'Event-Name' : 'query_user_channels_req', 'Realm' : '"
+ $fd + "', 'Username' : '" + $fU + "',
'Active-Only' : false }";
< kazoo_encode("$ci", "$var(callid_encoded)");
< $var(amqp_routing_key) = "call.status_req.$var(callid_encoded)";
< if(kazoo_query("callevt", $var(amqp_routing_key),
"{\"blop\":\"example\"}", "$var(amqp_result)")) {
< kazoo_json("$var(amqp_result)", "Channels[0].switch_url",
"$du");
< if($du != $null) {
< xlog("L_INFO", "$ci|log|user channels found redirecting call to
$du");
< return;
< }
< }
```
So, some issue in the exmaple's payload causes the crash. One the one hand, I think an
example from the documentation should somehow work, on the other hand I think that an
error in a JSON-payload is not indended to crash kamailio anyway.
<!--
If you found a solution or workaround for the issue, describe it. Ideally, provide a pull
request with a fix.
-->
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
kamailio -v
version: kamailio 5.6.0-dev2 (x86_64/linux) 63a349
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY,
USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535,
DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 63a349
compiled on 16:12:36 Nov 6 2021 with gcc 9.3.0
```
* **Operating System**:
<!--
Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04,
CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
uname -a
Linux hostname 5.11.0-38-generic #42~20.04.1-Ubuntu SMP Tue Sep 28 20:41:07 UTC 2021
x86_64 x86_64 x86_64 GNU/Linux
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
```
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