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From Stefan Priebe - Profihost AG <s.pri...@profihost.ag>
Subject Re: mod_http2 and Frequent wake-ups for mpm_event
Date Thu, 19 Jan 2017 21:01:06 GMT
new segfault with both patches on top of 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  0x00007fbefce0d014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#0  0x00007fbefce0d014 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fbefd2a0036 in ?? () from /usr/lib/x86_64-linux-gnu/libapr-1.so.0
#2  0x00007fbefd2a046f in apr_hash_set () from
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#3  0x000000000052a26b in h2_ihash_remove ()
#4  0x0000000000506b24 in purge_stream ()
#5  0x000000000052a1c2 in ihash_iter ()
#6  0x00007fbefd2a08a6 in apr_hash_do () from
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#7  0x000000000052a200 in h2_ihash_iter ()
#8  0x0000000000506b65 in purge_streams ()
#9  0x00000000005082dd in h2_mplx_release_and_join ()
#10 0x00000000005158f9 in h2_session_cleanup ()
#11 0x00000000005164a4 in session_pool_cleanup ()
#12 0x00007fbefd2a9976 in apr_pool_destroy () from
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#13 0x00007fbefd2a9c55 in apr_pool_clear () from
/usr/lib/x86_64-linux-gnu/libapr-1.so.0
#14 0x0000000000566acd in ap_push_pool ()
#15 0x000000000056008a in process_lingering_close ()
#16 0x0000000000560ced in listener_thread ()
#17 0x00007fbefd0780a4 in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#18 0x00007fbefcdad62d in clone () from /lib/x86_64-linux-gnu/libc.so.6

Stefan

Am 19.01.2017 um 21:48 schrieb Stefan Eissing:
> On top please. There is only one way: forward!
> 
>> Am 19.01.2017 um 21:47 schrieb Stefan Priebe - Profihost AG <s.priebe@profihost.ag>:
>>
>>
>> Am 19.01.2017 um 21:39 schrieb Stefan Eissing:
>>> Thanks, Stefan. Can you given the attached Patch a try? 
>>
>> sure. On top of the last one? Or should i drop it?
>>
>>
>> Stefan
>>
>>>> Am 19.01.2017 um 19:33 schrieb Stefan Priebe <s.priebe@profihost.ag>:
>>>>
>>>> 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 Münster
>>>>>>> www.greenbytes.de
>>>>>>>
>>>
>>> Stefan Eissing
>>>
>>> <green/>bytes GmbH
>>> Hafenstrasse 16
>>> 48155 Münster
>>> www.greenbytes.de
>>>
> 
> Stefan Eissing
> 
> <green/>bytes GmbH
> Hafenstrasse 16
> 48155 Münster
> www.greenbytes.de
> 

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