[OpenSIPS-Users] UDP workers consume 100% CPU

Răzvan Crainea razvan at opensips.org
Wed Aug 14 09:20:08 EDT 2019


I suspect you are facing an issue similar to this one[1], so I think we 
should move the discussion on that ticket. So please send us your 
updates over there.

[1] https://github.com/OpenSIPS/opensips/issues/1767

Best regards,
Răzvan

On 8/14/19 12:58 PM, Vitalii Aleksandrov wrote:
> Ok, I'll check when finish load testing with libssl-1.0.
> 
> 
>> Hi, Vitalii!
>>
>> Just to double check you are using the right overwritten functions, 
>> can you add some debugging in the tls_mgm code, recompile, and run the 
>> test again? I'm thinking to add something like the snippet below on 
>> line 1525[1]:
>> LM_INFO("initialized mutex over OpenSIPS\n");
>>
>> [1] 
>> https://github.com/OpenSIPS/opensips/blob/master/modules/tls_mgm/tls_mgm.c#L1525 
>>
>>
>> Best regards,
>> Răzvan
>>
>> On 8/12/19 7:20 PM, Vitalii Aleksandrov wrote:
>>> Checked the tls_mgm.c code and found that I wasn't right. I've just 
>>> downgraded libssl and restarted opensips without rebuilding it. Will 
>>> correctly rebuild opensips with libssl-1.0 dev files and retest.
>>> The workaround with pthread_mutex_init() and shm_malloc() wrapping 
>>> theoretically should work and Kamailio went the same way. Anyhow 
>>> something definitely wrong with this "workaround" and libssl-1.1
>>>
>>>
>>>> Hi,
>>>>
>>>> Downgraded libssl to 1.0.2n-1ubuntu5.3 available in repository and 
>>>> still can reproduce this bug. You were right that this is a deadlock 
>>>> in libssl. Found TCP worker process blocked in libcrypto and a bunch 
>>>> of processes burning CPU cycles in sched_yield() waiting for the 
>>>> lock. That's really strange that do completely different libssl 
>>>> versions have such a dangerous bug. Found a few opened issues 
>>>> related to libssl, but according to comments downgrading to 
>>>> libssl-1.0 helped to make it stable.
>>>>
>>>>> Hi,
>>>>>
>>>>> I'm using libssl-1.1.1-1ubuntu2.1~18.04.4
>>>>>
>>>>> Since I need SIP over TLS I can't just remove proto_tls. Will try 
>>>>> to reproduce it again and collect more data.
>>>>>
>>>>> On 07.08.19 13:18, Bogdan-Andrei Iancu wrote:
>>>>>> Hi Vitalii,
>>>>>>
>>>>>> As the backtraces show, it is a deadlock in TLS - if you remove 
>>>>>> the proto_tls, you will not experience this issue anymore. The 
>>>>>> root problem is not in OpenSIPS itself but in the libssl/libcrypto 
>>>>>> - what versions are you using for these libs ?
>>>>>>
>>>>>> Regards,
>>>>>>
>>>>>> Bogdan-Andrei Iancu
>>>>>>
>>>>>> OpenSIPS Founder and Developer
>>>>>>   https://www.opensips-solutions.com
>>>>>> OpenSIPS Summit 2019
>>>>>>   https://www.opensips.org/events/Summit-2019Amsterdam/
>>>>>>
>>>>>> On 08/05/2019 09:13 PM, Vitalii Aleksandrov wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I have a test opensips 2.4.6 (last week's checkout from 2.4 
>>>>>>> branch) and after short load testing it started to consume all 
>>>>>>> CPU resources.
>>>>>>>
>>>>>>> Here is what opensips floods to syslog:
>>>>>>> Aug  3 13:25:01 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231430 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231530 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231630 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231730 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231830 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176231930 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:utimer_ticker: 
>>>>>>> utimer task <tm-utimer> already scheduled for 114023190 ms (now 
>>>>>>> 176232030 ms), it may overlap..
>>>>>>> Aug  3 13:25:02 l /opensips[4774]: WARNING:core:timer_ticker: 
>>>>>>> timer task <tm-timer> already scheduled for 114023090 ms (now 
>>>>>>> 176232030 ms), it may overlap..
>>>>>>>
>>>>>>> Where 4774 is: "Process::  ID=7 PID=4774 Type=timer"
>>>>>>>
>>>>>>> Here is the TOP output for time consuming processes:
>>>>>>>   PID USER         PR  NI    VIRT    RES      SHR    S %CPU 
>>>>>>> %MEM     TIME+ COMMAND
>>>>>>>  4801 opensips  20   0  721040  28496  24240 R  52.9 0.7 1817:08 
>>>>>>> opensips
>>>>>>>  4802 opensips  20   0  721040  27724  23588 R  47.1 0.7 1813:06 
>>>>>>> opensips
>>>>>>>  4806 opensips  20   0  721040  27640  23532 R  47.1 0.7 1814:41 
>>>>>>> opensips
>>>>>>>  4833 opensips  20   0  721040  28848  24812 R  47.1 0.7 1815:16 
>>>>>>> opensips
>>>>>>>  4803 opensips  20   0  721044  27928  23732 R  41.2 0.7 1817:09 
>>>>>>> opensips
>>>>>>>  4804 opensips  20   0  721040  28188  23996 R  41.2 0.7 1816:05 
>>>>>>> opensips
>>>>>>>  4799 opensips  20   0  721040  28272  24172 R  35.3 0.7 1813:29 
>>>>>>> opensips
>>>>>>>  4800 opensips  20   0  721040  28340  24204 R  29.4 0.7 1816:52 
>>>>>>> opensips
>>>>>>>  4805 opensips  20   0  723256  29620  25300 R  29.4 0.8 1819:28 
>>>>>>> opensips
>>>>>>>
>>>>>>> And here is the "opensipsctl ps" for them:
>>>>>>> Process::  ID=32 PID=4799 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=33 PID=4800 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=34 PID=4801 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=35 PID=4802 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=36 PID=4803 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=37 PID=4804 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=38 PID=4805 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=39 PID=4806 Type=SIP receiver udp:127.0.0.1:5070
>>>>>>> Process::  ID=66 PID=4833 Type=TCP receiver
>>>>>>>
>>>>>>> "strace" output for those burning processes just floods with:
>>>>>>> 11:07:04.042794 sched_yield()           = 0
>>>>>>> 11:07:04.042869 sched_yield()           = 0
>>>>>>> 11:07:04.042943 sched_yield()           = 0
>>>>>>> 11:07:04.043016 sched_yield()           = 0
>>>>>>> 11:07:04.043090 sched_yield()           = 0
>>>>>>> 11:07:04.043164 sched_yield()           = 0
>>>>>>>
>>>>>>> Unfortunately this opensips is striped and gdb output is limited.
>>>>>>> GDB bt of TCP receiver:
>>>>>>> (gdb) bt
>>>>>>> #0  0x00007f939211fe57 in sched_yield () at 
>>>>>>> ../sysdeps/unix/syscall-template.S:78
>>>>>>> #1  0x00007f936fffc14d in ?? () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/proto_tls.so
>>>>>>> #2  0x00007f93791698d5 in send_pr_buffer () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #3  0x00007f93791626b8 in relay_reply () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #4  0x00007f937919fe2a in timer_routine () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #5  0x000055e00034a58a in handle_timer_job ()
>>>>>>> #6  0x000055e00041ae2a in tcp_worker_proc_loop ()
>>>>>>> #7  0x000055e000427218 in tcp_start_processes ()
>>>>>>> #8  0x000055e0002e6837 in main ()
>>>>>>>
>>>>>>> GDB bt of UDP receiver:
>>>>>>> #0  0x00007f939211fe57 in sched_yield () at 
>>>>>>> ../sysdeps/unix/syscall-template.S:78
>>>>>>> #1  0x00007f936fffc14d in ?? () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/proto_tls.so
>>>>>>> #2  0x00007f93791698d5 in send_pr_buffer () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #3  0x00007f93791626b8 in relay_reply () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #4  0x00007f9379165015 in reply_received () from 
>>>>>>> /usr/lib/x86_64-linux-gnu/opensips/modules/tm.so
>>>>>>> #5  0x000055e000322fed in forward_reply ()
>>>>>>> #6  0x000055e000309d1d in receive_msg ()
>>>>>>> #7  0x000055e00042b4be in ?? ()
>>>>>>> #8  0x000055e000413dd8 in udp_start_processes ()
>>>>>>> #9  0x000055e0002e6724 in main ()
>>>>>>>
>>>>>>> Those workers don't process any incoming SIP messages and just 
>>>>>>> stay in this infinite loop.
>>>>>>>
>>>>>>> Any input is very appreciated.
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Users mailing list
>>>>>>> Users at lists.opensips.org
>>>>>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>>>>>
>>>
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>>
> 
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-- 
Răzvan Crainea
OpenSIPS Core Developer
   http://www.opensips-solutions.com



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