Re: [Libevent-users] Re: libevent2 stuck in Linux, CPU 100%

[Azat Khuzhin <dohardgopro@xxxxxxxxx>]

Hi Oleg,

Could you run you program, and when this behavior reproduced run next
command, and attach some output here, or to pastebin:
strace -f -p PID # warning: may print many lines

On Fri, Jul 19, 2013 at 4:41 PM, Oleg Moskalenko <mom040267@xxxxxxxxx> wrote:
> I can add that this problem happen after "too many open file descriptors"
> condition reached but it persists even after the sockets are cleaned.
>
>
>
> On Fri, Jul 19, 2013 at 5:29 AM, Oleg Moskalenko <mom040267@xxxxxxxxx>
> wrote:
>>
>> Hi
>>
>> I am the author and developer of the rfc5766-turn-server project:
>>
>> https://code.google.com/p/rfc5766-turn-server/
>>
>> I have a strange problem with libevent2 consuming 100% of 100% of CPU in
>> Linux (any linux) on high load condition, even after the load is back to
>> normal. Basically, the system is doing nothing, just spinning inside
>> libevent loop, indefinitely. The system is responsitive, but CPU is consumed
>> 100%. When I connect to it with gdb, I always find myself somewhere inside
>> timing functions in epoll loop, for example:
>>
>> ==================================
>>
>> #0  0x00007f33e913a0d3 in epoll_wait () from
>> /lib/x86_64-linux-gnu/libc.so.6
>> #1  0x00007f33ea3b2f37 in ?? () from
>> /usr/lib/x86_64-linux-gnu/libevent_core-2.0.so.5
>> #2  0x00007f33ea39ede4 in event_base_loop () from
>> /usr/lib/x86_64-linux-gnu/libevent_core-2.0.so.5
>> #3  0x000000000040e1ec in run_events (eb=0x14ae060) at
>> src/apps/relay/mainrelay.c:1006
>> #4  0x000000000040e2dd in run_listener_server (eb=0x14ae060) at
>> src/apps/relay/mainrelay.c:1039
>> #5  0x0000000000410ebd in main (argc=0, argv=0x7fffffe549d8) at
>> src/apps/relay/mainrelay.c:2457
>>
>> =================================
>>
>> everything works fine in other OS's (BSD, Solaris). But all Linuxes have
>> this problem.
>>
>> I was searching the Internet and I found the thread where people are
>> having the exact same problem:
>>
>>
>> http://lists.pgfoundry.org/pipermail/pgbouncer-general/2011-May/000805.html
>>
>> They resolved the problem by not using the libevent. Unfortunately, my
>> system is built around libevent2 and I cannot afford that solution.
>>
>> is there a known bug, and how do I deal with this problem ? Too many users
>> are using Linux, I cannot tell everybody to switch to BSD.
>>
>> Thanks
>> Oleg
>>
>



-- 
Respectfully
Azat Khuzhin
Primary email a3at.mail@xxxxxxxxx
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