libev application stops responding and consumes 100% cpu

Kirill Timofeev kvt at
Tue Apr 8 03:40:03 CEST 2014

Hi Marc,

thank you very much for prompt response.

Sorry for extra header fields, unfortunately this is beyond my control :(.

I'm not calling ev_run directly in my code, but let me check latest 
libev version and see if this would resolve this issue.


On 04/07/2014 03:54 PM, Marc Lehmann wrote:
> On Mon, Apr 07, 2014 at 09:17:43AM -0700, Kirill Timofeev <kvt at> wrote:
>> Hi folks,
> X-Note: This Email was scanned by AppRiver SecureTide
> [...]
> It's not prudent to include a bunch of x-note headers in your e-mail -
> first of all, such headers are meaningless to others (and a nuisance
> to some), and actually make your mail look like spam, as many spammers
> include fake headers such as this to trick some e-mail systems into
> accepting them.
>> I've created libev based application, which works ok for some time,
>> but at random moment it stops responding and consumes 100% cpu. Here
>> is information on os and libev version:
> Well, it's probably a bug in your application. It is possible that you trip
> over a bug in libev 4.11, but not very likely - just try out 4.15 or current
> CVS to see if that is the case.
>> I generated core file from frozen process. Unfortunately I'm not
>> expert, so the only thing I see is that process got stuck in ev_run:
> Are you maybe calling ev_run in a loop? If libev is done it will return
> from ev_run, and if you then call it again, it will just return again...
>> Should I use latest code from official site or there is better way to
>> resolve this issue?
> Trying the latest code will make sure that it isn't something that has been
> fixed, so should be done in any case.
> More likely, though, this is some bug in your code, such as an endless loop
> around ev_run, or memory corruption corrupting some watcher list, causing an
> endless loop.
> You'd need a better backtrace (with line number info etc.) to tell more.

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