[asterisk-bugs] [JIRA] (ASTERISK-27023) Asterisk deadlock with pjproject

[Jatin Jain (JIRA)]

Jatin Jain created ASTERISK-27023:
-------------------------------------

             Summary: Asterisk deadlock with pjproject
                 Key: ASTERISK-27023
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27023
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 13.13.1
         Environment: Linux 2.6.32-431.el6.x86_64
            Reporter: Jatin Jain


Facing deadlock in asterisk while working with pjproject. I am using AMI and the connection gets blocked.

One of the threads takes a mon_lock in do_monitor and then calls pj_ice_sess_send_data in the pjproject library. This thread then tries to acquire another pj_mutex_lock but doesn't get it and keeps on waiting, keeping the mon_lock. 

bq.  #0  0x0000003dc280e264 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x0000003dc2809523 in _L_lock_892 () from /lib64/libpthread.so.0
#2  0x0000003dc2809407 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x00007f8f2ee17d44 in pj_mutex_lock () from /usr/lib/libasteriskpj.so
#4  0x00007f8f2ee1eb72 in pj_lock_acquire () from /usr/lib/libasteriskpj.so
#5  0x00007f8f2ee1ecd8 in grp_lock_acquire () from /usr/lib/libasteriskpj.so
#6  0x00007f8f2ee1f21e in pj_grp_lock_acquire () from /usr/lib/libasteriskpj.so
#7  0x00007f8f2edae862 in pj_ice_sess_send_data () from /usr/lib/libasteriskpj.so
#8  0x00007f8e9fea1afd in __rtp_sendto.clone.4 () from /usr/lib/asterisk/modules/res_rtp_asterisk.so
#9  0x00007f8e9fea8f98 in ast_rtcp_write_report () from /usr/lib/asterisk/modules/res_rtp_asterisk.so
#10 0x00007f8e9fea972d in ast_rtcp_write () from /usr/lib/asterisk/modules/res_rtp_asterisk.so
#11 0x00000000005c3abe in ast_sched_runq ()
#12 0x00007f8ebc1ed8df in do_monitor () from /usr/lib/asterisk/modules/chan_sip.so
#13 0x00000000006043b8 in dummy_start ()
#14 0x0000003dc28079d1 in start_thread () from /lib64/libpthread.so.0
#15 0x0000003dc20e8b6d in clone () from /lib64/libc.so.6


So no other thread is able to acquire this monlock which leads to deadlock.

As mentioned in [this|https://community.asterisk.org/t/help-with-asterisk-deadlock-possible-bug/65439] post, I initially thought its a duplicate of [ASTERISK-26831|https://issues.asterisk.org/jira/browse/ASTERISK-25275] manifesting in a different way, but I am using pjproject version 2.5.5 which already has the fix mentioned there but the issue still persists. 





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