https://bz.apache.org/bugzilla/show_bug.cgi?id=58267
Bug ID: 58267
Summary: " Error ap_proxy_set_scoreboard_lb(xxx) failed in
child xxx for worker xxx " flooding in error log
Product: Apache httpd-2
Version: 2.2.31
Hardware: PC
OS: Linux
Status: NEW
Severity: minor
Priority: P2
Component: mod_proxy_balancer
Assignee: [email protected]
Reporter: [email protected]
Created attachment 33021
--> https://bz.apache.org/bugzilla/attachment.cgi?id=33021&action=edit
httpd.conf that will trigger the error
Since the release of apache 2.2.31 our error log has been flooded with the
following
[Wed Aug 12 08:30:16 2015] [error] proxy: ap_proxy_set_scoreboard_lb(74) failed
in child 19010 for worker ajp://hostname02:8071
[Wed Aug 12 08:30:16 2015] [error] proxy: ap_proxy_set_scoreboard_lb(76) failed
in child 19010 for worker ajp://hostname01:8071
[Wed Aug 12 08:30:16 2015] [error] proxy: ap_proxy_set_scoreboard_lb(78) failed
in child 19010 for worker ajp://hostname02:8071
[Wed Aug 12 08:30:16 2015] [error] proxy: ap_proxy_set_scoreboard_lb(80) failed
in child 19010 for worker ajp://hostname03:8071
We actually found it in httpd-2.2.15-45.el6.x86_64 but we can confirm the same
behavior is present in 2.2.31 and in 2.2.x branch (2.2.32) too.
Attached a basic httpd.conf that will trigger the error.
In my test for triggering the error I had to satisfy the following conditions:
- BalanceMember > 16
- VirtualHost > 2
- "StandAlone" ProxyPass > 2 # Not a Balancer ProxyPass
For example with 17 BalanceMember and 5 childProcess, 5 lines were written in
the error log.
With 18 BM, 10 lines ; 19BM, 15 lines and so on.
When I tried to activate more VHost the increment was not linear, for example
with 17 BalancerMember and 5 childProcess I had :
2 vhost 5 lines
3 vhost 90 lines
4 vhost 175 lines
The error is triggered at startup, during restart and in some others conditions
(maybe when a child is spawned ? Not sure couldn't replicate in test ).
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