Hi
I found a deadlock which occurs when resolving STUN server:
(gdb) info thread
3 Thread 0x7f3b13a87700 (LWP 6129) 0x00007f3b1bdf020d in nanosleep () at
../sysdeps/unix/syscall-template.S:82
2 Thread 0x7f3b17674700 (LWP 6130) __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
* 1 Thread 0x7f3b1d63b740 (LWP 6124) __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
(gdb) thread 1
[Switching to thread 1 (Thread 0x7f3b1d63b740 (LWP 6124))]#0
__lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
136 in ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
(gdb) bt
#0 __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
#1 0x00007f3b1c98f864 in _L_lock_1024 () from /lib/libpthread.so.0
#2 0x00007f3b1c98f6c7 in __pthread_mutex_lock (mutex=0xdcb500) at
pthread_mutex_lock.c:82
#3 0x0000000000546a92 in pj_mutex_lock (mutex=0xdcb500) at
../src/pj/os_core_unix.c:1214
#4 0x0000000000542c39 in ioqueue_dispatch_read_event (ioqueue=0xdca8e0,
h=0xdcb3b8) at ../src/pj/ioqueue_common_abs.c:400
#5 0x0000000000544fc0 in pj_ioqueue_poll (ioqueue=0xdca8e0,
timeout=0x7fff5fa379e0) at ../src/pj/ioqueue_select.c:902
#6 0x000000000045ce8a in pjsip_endpt_handle_events2 (endpt=0xdbfb48,
max_timeout=0x7fff5fa37a20, p_count=0x7fff5fa37a3c) at
../src/pjsip/sip_endpoint.c:719
#7 0x00000000004259f8 in pjsua_handle_events (msec_timeout=10) at
../src/pjsua-lib/pjsua_core.c:1510
#8 0x000000000042535c in resolve_stun_server (wait=1) at
../src/pjsua-lib/pjsua_core.c:1258
#9 0x0000000000425b7f in create_sip_udp_sock (af=2, cfg=0x7e0408,
p_sock=0x7fff5fa37cb8, p_pub_addr=0x7fff5fa37d50) at
../src/pjsua-lib/pjsua_core.c:1612
#10 0x0000000000426274 in pjsua_transport_create (type=PJSIP_TRANSPORT_UDP,
cfg=0x7e0408, p_id=0x7fff5fa37fcc) at ../src/pjsua-lib/pjsua_core.c:1791
#11 0x0000000000411c59 in app_init (argc=2, argv=0x7fff5fa38228) at
../src/pjsua/pjsua_app.c:4827
#12 0x0000000000406fb4 in main (argc=2, argv=0x7fff5fa38228) at
../src/pjsua/main.c:82
(gdb) thread 2
[Switching to thread 2 (Thread 0x7f3b17674700 (LWP 6130))]#0
__lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
136 in ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
(gdb) bt
#0 __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
#1 0x00007f3b1c98f864 in _L_lock_1024 () from /lib/libpthread.so.0
#2 0x00007f3b1c98f6c7 in __pthread_mutex_lock (mutex=0xdbf738) at
pthread_mutex_lock.c:82
#3 0x0000000000546a92 in pj_mutex_lock (mutex=0xdbf738) at
../src/pj/os_core_unix.c:1214
#4 0x00000000004246a0 in destroy_stun_resolve (sess=0xdd6b18) at
../src/pjsua-lib/pjsua_core.c:952
#5 0x00000000004248ab in stun_resolve_complete (sess=0xdd6b18) at
../src/pjsua-lib/pjsua_core.c:990
#6 0x0000000000424ab3 in test_stun_on_status (stun_sock=0xdd6d38,
op=PJ_STUN_SOCK_BINDING_OP, status=0) at ../src/pjsua-lib/pjsua_core.c:1035
#7 0x00000000004d0b6c in sess_on_request_complete (sess=0xdd7f68, status=0,
token=0x1, tdata=0xdd9ea8, response=0xdd87c8, src_addr=0xdd7a40,
src_addr_len=16) at ../src/pjnath/stun_sock.c:705
#8 0x00000000004cd1e0 in stun_tsx_on_complete (tsx=0xdda028, status=0,
response=0xdd87c8, src_addr=0xdd7a40, src_addr_len=16)
at ../src/pjnath/stun_session.c:425
#9 0x00000000004d1b2b in pj_stun_client_tsx_on_rx_msg (tsx=0xdda028,
msg=0xdd87c8, src_addr=0xdd7a40, src_addr_len=16)
at ../src/pjnath/stun_transaction.c:437
#10 0x00000000004ced34 in on_incoming_response (sess=0xdd7f68, options=5,
pkt=0xdd7148 "\001\001", pkt_len=88, msg=0xdd87c8, src_addr=0xdd7a40,
src_addr_len=16) at ../src/pjnath/stun_session.c:1189
#11 0x00000000004cf3ee in pj_stun_session_on_rx_pkt (sess=0xdd7f68,
packet=0xdd7148, pkt_size=88, options=1, token=0x0, parsed_len=0x0,
src_addr=0xdd7a40,
src_addr_len=16) at ../src/pjnath/stun_session.c:1389
#12 0x00000000004d0dbc in on_data_recvfrom (asock=0xdd7058, data=0xdd7148,
size=88, src_addr=0xdd7a40, addr_len=16, status=0)
at ../src/pjnath/stun_sock.c:808
#13 0x000000000054a2a3 in ioqueue_on_read_complete (key=0xdcb3b8,
op_key=0xdd7918, bytes_read=88) at ../src/pj/activesock.c:482
#14 0x0000000000542fa1 in ioqueue_dispatch_read_event (ioqueue=0xdca8e0,
h=0xdcb3b8) at ../src/pj/ioqueue_common_abs.c:559
#15 0x0000000000544fc0 in pj_ioqueue_poll (ioqueue=0xdca8e0,
timeout=0x7f3b17673da0) at ../src/pj/ioqueue_select.c:902
#16 0x000000000045ce8a in pjsip_endpt_handle_events2 (endpt=0xdbfb48,
max_timeout=0x7f3b17673de0, p_count=0x7f3b17673dfc) at
../src/pjsip/sip_endpoint.c:719
#17 0x00000000004259f8 in pjsua_handle_events (msec_timeout=10) at
../src/pjsua-lib/pjsua_core.c:1510
#18 0x0000000000423a05 in worker_thread (arg=0x0) at
../src/pjsua-lib/pjsua_core.c:568
#19 0x0000000000545ee9 in thread_main (param=0xe2c038) at
../src/pj/os_core_unix.c:494
#20 0x00007f3b1c98d971 in start_thread (arg=<value optimized out>) at
pthread_create.c:304
#21 0x00007f3b1be2c92d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
I would take a guess that PJSUA_UNLOCK() before create_sip_udp_sock() in
pjsua_core.c:1791 and PJSUA_LOCK() after would suffice, but I don't know if
it safe.
--
Marcin Gozdalik
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