This was an interesting security patch that marked the first time in my memory that updating Apache led to an immediate regression. A few hours after taking this upgrade many systems experienced such strange timeout errors. Connections were low and couldn't pinpoint the misleading behavior that looked like a slowloris attack, with no connections.

Half a day later with no resolution in research a new patch [1] was available and problem resolved.

[1] https://github.com/apache/httpd/commit/8720881b0634383145e87...