apache2 crashed with SIGSEGV in ap_run_mpm_query()

StacktraceTop:
 ?? ()
 <signal handler called>
 __do_global_dtors_aux () from /tmp/apport_sandbox_RntTSy/lib/x86_64-linux-gnu/libnss_nis.so.2
 ?? ()
 ?? ()

Hi Stephan,
I was trying to reproduce today.

On Zesty:
$ apt-get install apache2 php7 mysql-server
$ service mysql status
$ service apache2 status

mysql and apache running fine, no crash in my retry.

checking versions:
apache2 2.4.25-3ubuntu2
mysql-server 5.7.17-0ubuntu1
php7.0 7.0.15-1ubuntu
php 1:7.0+49

It seems that does not trigger for me.
Is that for you 100% reproducable e.g. still on restarting services or was that something that happened only once?

Also you said you "just installed", so did your steps towards the issue match the ones I described above?

Happened one time right after the install. Your steps matched. I tried to recreate this today. And it was not reproducable. I was able to recreate it before reinstalling the VM. However my host windows install had some driver corruption that may have impacted the VM install. This can be closed as no longer reproducable.

Ok, thanks Stephan.
If you'd be ok please mark it non-private to allow others to search for it - just in case we will get more hits by others to the same issue.

This happened just after bootup.

StacktraceTop:
 ?? ()
 <signal handler called>
 __do_global_dtors_aux () from /mnt/sec-machines/apport-sandbox-dir/Ubuntu 17.04/amd64/report-sandbox/lib/x86_64-linux-gnu/libnss_nis.so.2
 ?? () from /mnt/sec-machines/apport-sandbox-dir/Ubuntu 17.04/amd64/report-sandbox/lib64/ld-linux-x86-64.so.2
 __run_exit_handlers (status=0, listp=0x7ff66fb545d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83

I got a better stacktrace, so I'm flipping this back to New.

Status changed to 'Confirmed' because the bug affects multiple users.

Thanks Brian for the extra stacktrace,
I found two more reports that seem to be the same to me - I dupped them here to focus efforts.

All reports seem to be 17.4 (x2) and 17.10, so rather new apache versions.

Is there any way to reliably reproduce known yet?

Hmm, I'm getting crash reports, let's see what they are about:
ubuntu@zesty-apache-segfault:~$ l /var/crash/
total 2.0K
drwxrwxrwt 2 root root 2 Aug 11 01:18 .
drwxr-xr-x 14 root root 16 Aug 25 20:55 ..
ubuntu@zesty-apache-segfault:~$ sudo su -
root@zesty-apache-segfault:~# service apache2 restart
root@zesty-apache-segfault:~# l /var/crash/
total 704K
drwxrwxrwt 2 root root 4 Aug 25 20:59 .
drwxr-xr-x 14 root root 16 Aug 25 20:55 ..
-rwxr-xr-x 1 root root 0 Aug 25 20:59 .lock
-rw-r----- 1 root root 699K Aug 25 20:59 _usr_sbin_apache2.0.crash

I tried apport-unpack on this file, but it crashed ;)

Andreas - could you open a bug report of apport-unpack failing to work with the .crash file you provided? Thanks in advance.

It already existed: https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1427600

$ apport-unpack _usr_sbin_apache2.0.crash output-dir
Traceback (most recent call last):
  File "/usr/bin/apport-unpack", line 73, in <module>
    pr.extract_keys(f, bin_keys, dir)
  File "/usr/lib/python3/dist-packages/problem_report.py", line 270, in extract_keys
    [item for item, element in b64_block.items() if element is False])
ValueError: ['UserGroups'] has no binary content

The crash file has:
(...)
Uname: Linux 4.10.0-32-generic x86_64
UserGroups:
CoreDump: base64
 H4sICAA(...)