https://bz.apache.org/bugzilla/show_bug.cgi?id=65521
Bug ID: 65521
Summary: httpd high CPU usage after jboss-remoting client exits
unexpectedly
Product: Apache httpd-2
Version: 2.4.48
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_http
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 37990
--> https://bz.apache.org/bugzilla/attachment.cgi?id=37990&action=edit
httpd error log
When httpd is used as a reverse proxy to WildFly, if a jboss-remoting Java
client (EJB client) exits unexpectedly (without closing the connection to httpd
/ WildFly), httpd enters a state where it causes high CPU usage. E.g.
top - 19:01:21 up 2 days, 22:42, 3 users, load average: 0.29, 0.08, 0.02
Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
Cpu(s): 16.6%us, 27.6%sy, 0.0%ni, 52.3%id, 1.8%wa, 0.0%hi, 1.7%si, 0.0%st
Mem: 16333992k total, 15372600k used, 961392k free, 150668k buffers
Swap: 8241148k total, 483044k used, 7758104k free, 7163264k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2807 httpspro 20 0 82524 2984 1532 R 84.6 0.0 0:25.94 httpd
If trace8 log level is activated, the logs are filled with lines like the
following:
[Thu Aug 26 15:37:02.854938 2021] [proxy:trace8] [pid 2085] proxy_util.c(4800):
[client 127.0.0.1:57485] proxy: HTTP: polling (client=14, origin=0)
[Thu Aug 26 15:37:02.854941 2021] [proxy:trace8] [pid 2085] proxy_util.c(4823):
[client 127.0.0.1:57485] AH10215: proxy: HTTP: woken up, 1 result(s)
[Thu Aug 26 15:37:02.854942 2021] [proxy:trace8] [pid 2085] proxy_util.c(4831):
[client 127.0.0.1:57485] proxy: HTTP: #0: client: 30/14
[Thu Aug 26 15:37:02.854944 2021] [proxy:trace8] [pid 2085] proxy_util.c(4800):
[client 127.0.0.1:57485] proxy: HTTP: polling (client=14, origin=0)
[Thu Aug 26 15:37:02.854946 2021] [proxy:trace8] [pid 2085] proxy_util.c(4823):
[client 127.0.0.1:57485] AH10215: proxy: HTTP: woken up, 1 result(s)
[Thu Aug 26 15:37:02.854948 2021] [proxy:trace8] [pid 2085] proxy_util.c(4831):
[client 127.0.0.1:57485] proxy: HTTP: #0: client: 30/14
The httpd logs (trace8 + dumpio) are attached. See error_log.
In order to resolve the issue, httpd needs to be restarted. The issue does not
reproduce when the following configuration directive is used:
ProxyWebsocketFallbackToProxyHttp Off
The issue was reproduced when both the Java client and httpd run on RHEL 6.7
(with WildFly 20). If the Java client runs on Windows the issue does not
reproduce.
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