With a vanilla  apache 2.4.25 i got this one:

Core was generated by `/usr/local/apache2/bin/httpd -k start'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fe2bb7b8add in read () from /lib/x86_64-linux-gnu/libpthread.so.0
(gdb) bt
#0  0x00007fe2bb7b8add in read () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x000000000048043a in ap_mpm_podx_check ()
#2  <signal handler called>
#3  0x000000004b351bd0 in ?? ()
Cannot access memory at address 0x0

I'm compiling apache 2.4.25 against:
libapr1: 1.5.1-3
libaprutil1: 1.5.4-1

from debian jessie and

libnghttp2-14: 1.13.0-1

build from upstream sources. May this be relevant?

Still not oberving any crashes running apache 2.4.23.

Greets,
Stefan

Am 19.01.2017 um 08:22 schrieb Stefan Priebe - Profihost AG:
> Hi Stefan,
> 
> Apache 2.4.25 + mpm_event V7 and core mod_http2:
> Core was generated by `/usr/local/apache2/bin/httpd -k start'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x0000000000521d98 in h2_stream_out_prepare ()
> (gdb) bt
> #0  0x0000000000521d98 in h2_stream_out_prepare ()
> #1  0x00007f54f27eba80 in ?? ()
> #2  0x00007f54f27eba8c in ?? ()
> #3  0x00007f54f27eba90 in ?? ()
> #4  0x00007f54ef00e0a0 in ?? ()
> #5  0x00007f54ef00e9a8 in ?? ()
> #6  0x00007f54f27ebac0 in ?? ()
> #7  0x0000000000000000 in ?? ()
> 
> so it's crashing with mpm_event and without mpm_event. And it does with
> core mod_http2 and mod_http2 v1.8.8.
> 
> Is a regression in mod_http2 possible?
> 
> Greets,
> Stefan
> Am 19.01.2017 um 07:55 schrieb Stefan Priebe - Profihost AG:
>> Dear Stefan,
>>  dear Yann,
>>
>> a longer test run shows it's also crashing without any mpm_event patch
>> at all. So I'm really sorry. It just starts crashing faster with the
>> mpm_event patches.
>>
>> I'll now retest regarding mod_http2 core, plain apache 2.4.25 and
>> mod_http v1.8.8
>>
>> may be it's a regression in 2.4.25 itself or in mod_http2.
>>
>> Stefan
>>
>> Am 19.01.2017 um 00:52 schrieb Yann Ylavic:
>>> On Wed, Jan 18, 2017 at 10:49 PM, Stefan Priebe - Profihost AG
>>> <s.pri...@profihost.ag> wrote:
>>>>
>>>> v5 does not apply to 2.4.25. If you can send me a v5 version that
>>>> applies to 2.4.25 i'll test.
>>>
>>> Here it is (slightly modified to fix possible deadlocks, per r1762742
>>> and r1774538).
>>>
>>> Thanks!
>>>

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