New subject: FreeSwitch blocked

7 Dec 2018

      Hi,

After deeply research about this issue, we understand *Freeswitch-Core*
mechanism and three possible solutions for fixing these issue.

Here the link
https://stackoverflow.com/questions/53609817/freeswitch-blocked

Actually it would be be better third solution supported by *Freeswitch*,
before deliver event to module, it create new thread for not waiting
consumer thread (event hendler)

On Fri, Dec 22, 2017 at 8:35 AM Melek Oktay <melekoktay@gmail.com> wrote:
...
Hi,
FreeSwitch software working well in a few days (~3 - 5 days), then new
incoming call requests are accepted since FreeSwitch is blocked !! Ongoing
calls continue their session, their calls seems not effected, but new calls
are not accepted.  I got FreeSwitch snapshot and analyzed it in GDB.
I have 601 therads & most of them are waiting
Thread 0x7f16bc55f700 (LWP 28544) pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
When i apply "*thread apply all bt*" in gdb, I see most of the threads
try to push events into queue (*switch_queue_push *)
Thread 600 (Thread 0x7f16bc55f700 (LWP 28544)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f180cf9b87d in apr_thread_cond_wait (cond=<optimized out>,
mutex=<optimized out>) at locks/unix/thread_cond.c:68
#2  0x00007f180cf92dd0 in apr_queue_push (queue=queue@entry=0x7f180db157a8,
data=data@entry=0x7f16d3d5ec20) at misc/apr_queue.c:166
#3  0x00007f180cc958fb in *switch_queue_push *(queue=*0x7f180db157a8*,
data=data@entry=*0x7f16d3d5ec20*) at src/switch_apr.c:1134
#4  0x00007f180cd17850 in switch_event_queue_dispatch_event
(eventp=0x7f16bc55ec48) at src/switch_event.c:384
#5  switch_event_fire_detailed (file=file@entry=0x7f180cfb07ea
"src/switch_channel.c", func=func@entry=0x7f180cfb2ba0 <__func__.18348>
"switch_channel_perform_set_running_state", line=line@entry=2260,
event=event@entry=0x7f16bc55ec48, user_data=user_data@entry=0x0) at
src/switch_event.c:1986
#6  0x00007f180cc9f118 in switch_channel_perform_set_running_state
(channel=0x7f17e3e7de00, state=CS_NEW, file=0x7f180cfbc590
"src/switch_core_state_machine.c", func=<optimized out>, line=543) at
src/switch_channel.c:2260
#7  0x00007f180ccc87d0 in switch_core_session_run (session=0x7f17e3e7fd28)
at src/switch_core_state_machine.c:543
#8  0x00007f180ccc36de in switch_core_session_thread (thread=<optimized
out>, obj=0x7f17e3e7fd28) at src/switch_core_session.c:1629
#9  0x00007f180ccbf47d in switch_core_session_thread_pool_worker
(thread=0x7f17e3e9abb0, obj=0x80) at src/switch_core_session.c:1692
#10 0x00007f180cfa1910 in dummy_worker (opaque=0x7f17e3e9abb0) at
threadproc/unix/thread.c:151
#11 0x00007f180c1e0064 in start_thread (arg=0x7f16bc55f700) at
pthread_create.c:309
#12 0x00007f180b8b862d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
More interesting thing is below, when I look up event type, approximately
all of  them are "SWITCH_EVENT_CHANNEL_STATE" and switch_queue (i think
sofia_module queue is used in this scenario ) *become full* !!! *nelts*
(number of elements ) and *bounds *values are equal, and there are 553
(full_waiters) waiters try to push , but no body try to consume it
(empty_waiters = 0)
(gdb) print *(switch_queue_t *) *0x7f180db157a8*
$1 = {
  data = 0x7f1805cfe038,
  nelts = 50000,
  in = 43000,
  out = 43000,
  bounds = 50000,
  full_waiters = 553,
  empty_waiters = 0,
  one_big_mutex = 0x7f180db157e8,
  not_empty = 0x7f180db15838,
  not_full = 0x7f180db15890,
  terminated = 0
}
(gdb) print *(switch_event_t *) *0x7f16d3d5ec20*
$1 = {
  event_id = SWITCH_EVENT_CHANNEL_STATE,
  priority = SWITCH_PRIORITY_NORMAL,
  owner = 0x0,
  subclass_name = 0x0,
  headers = 0x7f16d3d5f750,
  last_header = 0x7f16d3d601d0,
  body = 0x0,
  bind_user_data = 0x0,
  event_user_data = 0x0,
  key = 0,
  next = 0x0,
  flags = 0
}
Why i am gonna getting this state?
Any thoughts, tips, tricks would be much appreciated.
Regards,
Angel

Re: [Freeswitch-users] FreeSwitch blocked

Melek Oktay

Ken Rice

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participants (2)