https://bz.apache.org/bugzilla/show_bug.cgi?id=65519
Bug ID: 65519
Summary: mod_proxy_http hangs after HTTP upgrade to
jboss-remoting
Product: Apache httpd-2
Version: 2.4.48
Hardware: PC
OS: Linux
Status: NEW
Severity: regression
Priority: P2
Component: mod_proxy_http
Assignee: bugs@httpd.apache.org
Reporter: mariust...@yahoo.com
Target Milestone: ---
Created attachment 37988
--> https://bz.apache.org/bugzilla/attachment.cgi?id=37988&action=edit
Test harness + logs
When httpd is used as a reverse proxy to WildFly, it sometimes hangs when a
Java client tries to connect to WildFly via jboss-remoting (EJB calls). This
works fine in httpd version 2.4.46.
This is an intermittent issue (in my testing, more than 50% of the connections
hang).
How to reproduce:
1. Deploy the attached EAR file (simple-ear.ear) in WildFly 13. The EAR
contains a single EJB that will be accessed by the client.
2. Configure httpd as a reverse proxy to WildFly (httpd should handle HTTP
protocol upgrade to jboss-remoting):
ProxyPass "/" "ws://localhost:1026/" upgrade=jboss-remoting
A sample configuration file is attached (httpd.conf)
3. Run the attached standalone Java client that attempts to invoke an EJB in
WildFly via httpd. Before running the client, you need to copy the WildFly
client library (jboss-client.jar) to the lib folder (this is not included in
the archive due to its size).
cd echo-client-wf13
java -cp ./bin:./lib/jboss-client.jar:./lib/simple-ejbClient.jar
com.microfocus.echoclient.EchoClient "remote+https" "localhost" "4433"
Port 4433 is SSL enabled. For clear text communication use protocol as
"remote+http" and port as "80".
The client requires Java 8 or above (testing was done with Java 8).
When it works, the client displays the following:
Aug 25, 2021 2:54:46 PM org.wildfly.security.Version <clinit>
INFO: ELY00001: WildFly Elytron version 1.3.3.Final
Aug 25, 2021 2:54:46 PM org.wildfly.naming.client.Version <clinit>
INFO: WildFly Naming version 1.0.9.Final
Aug 25, 2021 2:54:47 PM org.xnio.Xnio <clinit>
INFO: XNIO version 3.6.3.Final
Aug 25, 2021 2:54:47 PM org.xnio.nio.NioXnio <clinit>
INFO: XNIO NIO Implementation Version 3.6.3.Final
Aug 25, 2021 2:54:47 PM org.jboss.threads.Version <clinit>
INFO: JBoss Threads version 2.3.2.Final
Aug 25, 2021 2:54:47 PM org.jboss.remoting3.EndpointImpl <clinit>
INFO: JBoss Remoting version 5.0.7.Final
Aug 25, 2021 2:54:47 PM org.jboss.ejb.client.EJBClient <clinit>
INFO: JBoss EJB Client version 4.0.10.Final
Result from EchoService: hello
When it doesn't work, the client hangs and the last line from above is not
displayed.
The httpd error logs (LogLevel trace8 + dumpio) for the case when the call
hangs are in: error_log_blocked.txt
The last log entry in this case is:
Wed Aug 25 19:25:54.299051 2021] [proxy:trace8] [pid 31599] proxy_util.c(4800):
[client 127.0.0.1:58402] proxy: HTTP: polling (client=31, origin=31)
tcpdump on the WildFly port shows that after the protocol upgrade is accepted
by WildFly (status code 101), the jboss-remoting conversation begins by WildFly
sending another TCP packet to httpd.
This packet is acknowledged by the httpd socket but the data is not visible in
httpd (the polling does not return). See tcpdump1026-blocked.txt
The httpd error logs for the case when the call works are in: error_log_ok.txt
The corresponding tcpdump is in tcpdump1026-ok.txt
The issue does not reproduce when the following directive is added to httpd
conf: "ProxyWebsocketFallbackToProxyHttp Off". So it seems that when the
protocol upgrade is handled by mod_proxy_wstunnel everything is working as
expected.
Also, the issue only reproduces with WildFly 13. The same scenario executed
against WildFly 20 does not reproduce the issue. However this seems like a race
condition so it might reproduce even with WildFly 20 granted that more testing
is performed.
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