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From Stefan Eissing <stefan.eiss...@greenbytes.de>
Subject Re: mod_http2 and Frequent wake-ups for mpm_event
Date Wed, 18 Jan 2017 12:39:54 GMT
Yann,

all these traces point to the connection shutdown case for mod_http2 which is triggered by
writing a special meta bucket and cleaning up on its destruction. That's the trick to make
sure that all data has been sent and similar to the EOR bucket. 

There is currently no cleanup register for shutting down that way. If the main connection
pool gets cleaned before the special meta is destroyed, these problem might happen. Not sure.

-Stefan

> Am 18.01.2017 um 13:32 schrieb Stefan Priebe - Profihost AG <s.priebe@profihost.ag>:
> 
> Hi,
> 
> and a new one just some seconds ago:
> (gdb) bt
> #0  0x00007f32a3747014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
> #1  0x00007f32a3bda036 in ?? () from /usr/lib/x86_64-linux-gnu/libapr-1.so.0
> #2  0x00007f32a3bda46f in apr_hash_set () from
> /usr/lib/x86_64-linux-gnu/libapr-1.so.0
> #3  0x000000000052a238 in h2_ihash_remove ()
> #4  0x000000b700000000 in ?? ()
> #5  0x00007f329410e328 in ?? ()
> #6  0x00007f3283fe6300 in ?? ()
> #7  0x0000000000506b24 in purge_stream ()
> #8  0x00007f3282edf0a0 in ?? ()
> #9  0x00007f3282ecf2d8 in ?? ()
> #10 0x00007f32940e60a0 in ?? ()
> #11 0x000000b700000000 in ?? ()
> #12 0x00007f3282edf0a0 in ?? ()
> #13 0x00007f3282ecf2d8 in ?? ()
> #14 0x00007f3283fe6340 in ?? ()
> #15 0x000000000052a18f in ihash_iter ()
> #16 0x00007f3282edf0a0 in ?? ()
> #17 0x0000000000000004 in ?? ()
> #18 0x00007f3282edf0a0 in ?? ()
> #19 0x00007f3283fe63c0 in ?? ()
> #20 0x0000000000000000 in ?? ()
> 
> Stefan
> 
> Am 18.01.2017 um 12:49 schrieb Stefan Priebe - Profihost AG:
>> Hi,
>> 
>> site is mostly used with http2. So it may be totally unrelated to
>> mod_http2. Sorry for the noise than. I just thought it by digging
>> through the traces.
>> 
>> Stefan
>> 
>> Am 18.01.2017 um 12:34 schrieb Yann Ylavic:
>>> Hi Stefan,
>>> 
>>> On Wed, Jan 18, 2017 at 11:33 AM, Stefan Priebe - Profihost AG
>>> <s.priebe@profihost.ag> wrote:
>>>> 
>>>> after applying the event patch to 2.4.25 from
>>>> https://bz.apache.org/bugzilla/show_bug.cgi?id=57399.
>>>> 
>>>> I'm seeing segfaults in the mod_http2 code. I already bumped mod_http2
>>>> to v1.8.8. But the segfaults are still happening.
>>> 
>>> Does it happen only with http2, or maybe your site is mostly h2-used only?
>>> 

Stefan Eissing

<green/>bytes GmbH
Hafenstrasse 16
48155 M√ľnster
www.greenbytes.de


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