Bug#902493: apache2-bin: Event MPM listener thread may get blocked by SSL shutdowns

[Anton Dollmaier <antondollmaier@aditsystems.de>]

Hi all,


On Fri, 5 Oct 2018 14:02:41 +0200 Sven Hartge <sven@svenhartge.de> wrote:
> On Wed, 27 Jun 2018 10:39:51 +0200 Martijn Grendelman
> <martijn.grendelman@isaac.nl> wrote:
>
> > Some of our Debian Stretch based Apache webservers suffer from
> > intermittent connection timeouts.
> > 
> > We have been trying to pin down the problem for a while, and eventually,
> > we found this bug report in Apache's Bugzilla, that seems to fit our
> > problem perfectly:
> > 
> > https://bz.apache.org/bugzilla/show_bug.cgi?id=60956
>
> I can verifiy and this bug and also had to change to mpm_worker to work
> around this bug.
>
> A backport of the changes in mpm_event made for 2.4.28 would be very
> nice, just like mod_http2 was backported from a newer version of apache2.

After suffering (probably) from this issue on multiple systems, I'd 
appreciate backporting the fix from Apache 2.4.28 to Stretch as well.

It could be just my personal impression, but it seems like this is 
affecting more systems over time. We spotted the issue (Apache hangs 
without warning and without logs until restarted or the timeout clears) 
on just one system, now multiple systems are affected, even with low or 
even just internal (browser clients behind VPN) traffic.

Switching to MPM_Worker helped to solve this in the meantime.

Best,
Anton Dollmaier