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From Stefan Priebe <s.pri...@profihost.ag>
Subject Re: mod_http2 and Frequent wake-ups for mpm_event
Date Thu, 19 Jan 2017 18:33:03 GMT
Here some more segfaults from 2.4.25 no mpm patch but http2 v1.8.8:

#################################################################

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/local/apache2/bin/httpd -k start'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f61f673b014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#0  0x00007f61f673b014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f61f6bce036 in ?? () from /usr/lib/x86_64-linux-gnu/libapr-1.so.0
#2  0x00007f61f6bce46f in apr_hash_set () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#3  0x000000000052a26d in h2_ihash_remove ()
#4  0x0000000000506b24 in purge_stream ()
#5  0x000000000052a1c4 in ihash_iter ()
#6  0x00007f61f6bce8a6 in apr_hash_do () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#7  0x000000000052a202 in h2_ihash_iter ()
#8  0x0000000000506b65 in purge_streams ()
#9  0x00000000005082df in h2_mplx_release_and_join ()
#10 0x00000000005158fb in h2_session_cleanup ()
#11 0x00000000005164a6 in session_pool_cleanup ()
#12 0x00007f61f6bd7976 in apr_pool_destroy () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#13 0x00007f61f6bd7c55 in apr_pool_clear () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#14 0x0000000000566acf in ap_push_pool ()
#15 0x000000000056008c in process_lingering_close ()
#16 0x0000000000560cef in listener_thread ()
#17 0x00007f61f69a60a4 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#18 0x00007f61f66db62d in clone () from /lib/x86_64-linux-gnu/libc.so.6

#################################################################

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/local/apache2/bin/httpd -k start'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f61f673b014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#0  0x00007f61f673b014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f61f6bce036 in ?? () from /usr/lib/x86_64-linux-gnu/libapr-1.so.0
#2  0x00007f61f6bce46f in apr_hash_set () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#3  0x000000000052a26d in h2_ihash_remove ()
#4  0x0000000000506b24 in purge_stream ()
#5  0x000000000052a1c4 in ihash_iter ()
#6  0x00007f61f6bce8a6 in apr_hash_do () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#7  0x000000000052a202 in h2_ihash_iter ()
#8  0x0000000000506b65 in purge_streams ()
#9  0x00000000005082df in h2_mplx_release_and_join ()
#10 0x00000000005158fb in h2_session_cleanup ()
#11 0x00000000005164a6 in session_pool_cleanup ()
#12 0x00007f61f6bd7976 in apr_pool_destroy () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#13 0x00007f61f6bd7c55 in apr_pool_clear () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#14 0x0000000000566acf in ap_push_pool ()
#15 0x000000000056008c in process_lingering_close ()
#16 0x0000000000560cef in listener_thread ()
#17 0x00007f61f69a60a4 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#18 0x00007f61f66db62d in clone () from /lib/x86_64-linux-gnu/libc.so.6

#################################################################

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f204f922d63 in apr_pool_cleanup_kill () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
(gdb) bt
#0  0x00007f204f922d63 in apr_pool_cleanup_kill () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#1  0x00007f204f922e21 in apr_pool_cleanup_run () from 
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#2  0x000000000055ffe9 in process_lingering_close ()
#3  0x0000000000560cef in listener_thread ()
#4  0x00007f204f6f00a4 in start_thread () from 
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f204f42562d in clone () from /lib/x86_64-linux-gnu/libc.so.6

full bt:
http://pastebin.com/raw/bP1vaYjw

#################################################################

Greets,
Stefan

Am 19.01.2017 um 16:47 schrieb Stefan Priebe - Profihost AG:
> arg sorry my fault.
>
> Here is a complete trace:
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x00007fc1c23e0f23 in apr_brigade_length () from
> /usr/lib/x86_64-linux-gnu/libaprutil-1.so.0
> (gdb) bt
> #0  0x00007fc1c23e0f23 in apr_brigade_length () from
> /usr/lib/x86_64-linux-gnu/libaprutil-1.so.0
> #1  0x000000000052a8f1 in h2_util_bb_avail ()
> #2  0x0000000000521eaa in h2_stream_out_prepare ()
> #3  0x000000000051a55a in on_stream_resume ()
> #4  0x000000000050bdff in h2_mplx_dispatch_master_events ()
> #5  0x000000000051dc32 in h2_session_process ()
> #6  0x0000000000500115 in h2_conn_run ()
> #7  0x0000000000504b51 in h2_h2_process_conn ()
> #8  0x000000000047cb19 in ap_run_process_connection ()
> #9  0x000000000055e755 in process_socket ()
> #10 0x0000000000560f5c in worker_thread ()
> #11 0x00007fc1c1f8d0a4 in start_thread () from
> /lib/x86_64-linux-gnu/libpthread.so.0
> #12 0x00007fc1c1cc262d in clone () from /lib/x86_64-linux-gnu/libc.so.6
>
> Stefan
>
> Am 19.01.2017 um 16:45 schrieb Stefan Priebe - Profihost AG:
>>
>> Am 19.01.2017 um 16:34 schrieb Stefan Eissing:
>>> Yann might already have asked this: any chance to compile with symbols and get
a more readable stacktrace?
>>
>> Yes just tell me how ;-) i'm using dpkg-buildpackage and dh_strip. I've
>> no idea why not all symbols are available.
>>
>> Do i need to pass a specific option to configure
>>
>> Stefan
>>
>>>> Am 19.01.2017 um 16:30 schrieb Stefan Priebe - Profihost AG <s.priebe@profihost.ag>:
>>>>
>>>> With stock 2.4.25 + patch i'm getting this one again:
>>>> (gdb) bt
>>>> #0  0x0000000000521dcd in h2_stream_out_prepare ()
>>>> #1  0x00007fc1a2feca80 in ?? ()
>>>> #2  0x00007fc1a2feca8c in ?? ()
>>>> #3  0x00007fc1a2feca90 in ?? ()
>>>> #4  0x00007fc1a057c0a0 in ?? ()
>>>> #5  0x00007fc1a057cdd8 in ?? ()
>>>> #6  0x00007fc1a2fecac0 in ?? ()
>>>> #7  0x0000000000000000 in ?? ()
>>>>
>>>> Stefan
>>>>
>>>> Am 19.01.2017 um 16:28 schrieb Stefan Priebe - Profihost AG:
>>>>> I'm now testing stock 2.4.25 + patch.
>>>>>
>>>>> May this configure option have an influence?
>>>>> --enable-nonportable-atomics=yes
>>>>>
>>>>> Greets,
>>>>> Stefan
>>>>>
>>>>> Am 19.01.2017 um 15:35 schrieb Yann Ylavic:
>>>>>> Hi,
>>>>>>
>>>>>> On Thu, Jan 19, 2017 at 3:00 PM, Stefan Priebe - Profihost AG
>>>>>> <s.priebe@profihost.ag> wrote:
>>>>>>>
>>>>>>> @Yann:
>>>>>>> should i use V7 or V6?
>>>>>>
>>>>>> I'd prefer you'd use none (such that we can verify the patch with
>>>>>> stock 2.4.25, modulo mod_http2), but if it's easier for you to
>>>>>> reproduce with an event's patch, please use the v6 (and if it fails
>>>>>> then v7, and if it fails then no patch, really).
>>>>>>
>>>
>>> Stefan Eissing
>>>
>>> <green/>bytes GmbH
>>> Hafenstrasse 16
>>> 48155 M√ľnster
>>> www.greenbytes.de
>>>

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