RFR: 8350545: Several sun/management/jdp tests fails java.net.SocketException

[SendaoYan]

On Mon, 24 Feb 2025 09:58:47 GMT, SendaoYan <syan at openjdk.org> wrote:

>> The tested address:port is hard code to '224.0.23.178:7095' by file test/jdk/sun/management/jdp/ClientConnection.java. This address:port work normally on most machines, but cannot work on machine which can not connect to the internet directly.
>
> Seems that the exception from src/java.base/unix/native/libnio/ch/Net.c:679.
> I'm not familiar with jdp feature, Could you give me some advices how to make check is the test choosing the wrong interface or address.
> 
> The information test system which report test failure shows below:
> 
> 
>> ifconfig 
> enP2p129s0f1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet 192.168.50.12  netmask 255.255.255.0  broadcast 192.168.50.255
>         inet6 fe80::1163:1d10:87a:6be4  prefixlen 64  scopeid 0x20<link>
>         ether a0:36:9f:53:17:f6  txqueuelen 1000  (Ethernet)
>         RX packets 22678271  bytes 28824464370 (26.8 GiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 9400465  bytes 7501254087 (6.9 GiB)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
>         inet 127.0.0.1  netmask 255.0.0.0
>         inet6 ::1  prefixlen 128  scopeid 0x10<host>
>         loop  txqueuelen 1000  (Local Loopback)
>         RX packets 26485240  bytes 221859212049 (206.6 GiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 26485240  bytes 221859212049 (206.6 GiB)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
>> ip r
> 192.168.50.0/24 dev enP2p129s0f1 proto kernel scope link src 192.168.50.12 metric 100 
> 
> 
> Command wget shows that it should connect to internet through a jumper machine(192.168.50.1:10991):
> 
> 
>> wget www.bing.com
> --2025-02-24 17:56:25--  http://www.bing.com/
> Connecting to 192.168.50.1:10991... connected.
> Proxy request sent, awaiting response... 301 Moved Permanently
> Location: http://cn.bing.com/ [following]
> --2025-02-24 17:56:25--  http://cn.bing.com/
> Reusing existing connection to 192.168.50.1:10991.
> Proxy request sent, awaiting response... 200 OK
> Length: 13006 (13K) [text/html]
> Saving to: ‘index.html’
> 
> index.html                                        100%[=============================================================================================================>]  12.70K  --.-KB/s    in 0s      
> 
> 2025-02-24 17:56:25 (28.7 MB/s) - ‘index.html’ saved [13006/13006]

The test test/jdk/com/sun/jndi/ldap/LdapPoolTimeoutTest.java will report "MSG RTE: javax.naming.CommunicationException: example.com:1234 [Root exception is java.net.UnknownHostException: example.com]" failure on the same machine. If I add argument " -Dhttp.proxyHost=192.168.50.1 -Dhttp.proxyPort=10991 -Dhttps.proxyHost=192.168.50.1 -Dhttps.proxyPort=10991 -DsocksProxyHost=192.168.50.1 -DsocksProxyPort=10991" to jtreg, this test will run passes. Maybe we need to investigate why the proxy do not work for sun/management/jdp tests.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23738#discussion_r1970775057