Segfault In grp_lock_dec_ref

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Hi,

I am seeing the following crash when using PJSIP 2.9 with Asterisk:

Thread 1 (Thread 0x7f328322a700 (LWP 57417)):
#0  0x00007f35a02a61e1 in grp_lock_dec_ref (glock=0x111) at ../src/pj/lock.c:554
        cnt = 0
#1  0x00007f35a02a6242 in pj_grp_lock_dec_ref (glock=0x111) at ../src/pj/lock.c:646
#2  0x00007f35a02b6da8 in pj_timer_heap_poll (ht=0xfbd740, next_delay=0x7f3283229cd0) at ../src/pj/timer.c:662
        node = 0x7f34547e95a8
        grp_lock = 0x111
        now = {sec = 17991022, msec = 266}
        count = 2
#3  0x00007f35a0200981 in pjsip_endpt_handle_events2 (endpt=0xfbd458, max_timeout=0x7f3283229d40, p_count=0x0) at ../src/pjsip/sip_endpoint.c:716
        timeout = {sec = 0, msec = 0}
        count = 0
        net_event_count = 0
        c = 0
#4  0x00007f35a0200ac6 in pjsip_endpt_handle_events (endpt=0xfbd458, max_timeout=0x7f3283229d40) at ../src/pjsip/sip_endpoint.c:777
#5  0x00007f339ed80c4d in monitor_thread_exec (endpt=0x0) at res_pjsip.c:4519
        delay = {sec = 0, msec = 10}
#6  0x00007f35a029d76f in thread_main (param=0x2abc948) at ../src/pj/os_core_unix.c:541
        rec = 0x2abc948
        result = 0x0
        rc = 0
#7  0x00007f359e075dd5 in start_thread () at /usr/lib64/libpthread.so.0
#8  0x00007f359d41802d in clone () at /usr/lib64/libc.so.6

 This again looks to be related to the timer implementation. Is there anything that can be done to fix this and the other timer-based issues I've raised before?

Kind regards,

Ross
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