[Bug 1466926] [NEW] reload apache2 with mpm_event cause scoreboard is full

[Branislav Staron]

Public bug reported:

On the clean install Ubuntu 14.04 with Apache without almost any client
load the Apache server with the command "service apache2 reload" itself
allocates slots marked with "Gracefully finishing" for which rejects new
connections.

For full rejection of new requests is sufficient to perform 4x command
"service apache2 reload".

Ubuntu 14.04.2 LTS
Apache 2.4.7-ubuntu4.4 (mpm_event)
Kernel 2.16.0-30-generic


Reproduce problem:
#################################################
1/ service apache2 start
______________________________________________________W_________
___________.....................................................
......................

2/ service apache2 reload

.........................GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGG__________________________________________________W__
______________________

3/ service apache2 reload

___W_____________________GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGG__________________________________________________...
......................

4/ service apache2 reload

GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG___
W_____________________

5/ service apache2 reload -> Server Apache not responding 
With logs in apache error log file:
... [mpm_event:error] [pid 9381:tid 1234563234] AH00485: scoreboard is full, not at MaxRequestWorkers
...
#################################################


My workaround was change to  MPM module  from "mpm_event" to "mpm_worker".

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

** Package changed: installation-report (Ubuntu) => apache2 (Ubuntu)

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Title:
  reload apache2  with mpm_event cause  scoreboard is full

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