[SSHD-1085] channel.waitFor() get stuck when run reboot command

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 2.5.1
• Environment: linux
• Assignee: Lyor Goldstein
• Reporter: min yun law
• Created: 22/Sep/20 19:57
• Updated: 25/Feb/21 17:47
• Resolved: 09/Dec/20 21:20

Description

Trying to run linux command "reboot" by mina sshd to remote node, the node is in reboot, but the ClientChannel object still keep open, not in closed status, Here is the logic code in my project:

 

String command = "reboot";
ChannelExec channel = clientSession.createExecChannel(command);
if(!channel.isClosed())
{
ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayOutputStream err = new ByteArrayOutputStream(); channel.setOut(out); 
channel.setErr(err); 
channel.open().await();  //this passed 
//follow call will cause stuck 
Collection<ClientChannelEvent> waitMask = channel.waitFor(REMOTE_COMMAND_WAIT_EVENTS, 0L);  
String outputStr = new String(out.toByteArray(), StandardCharsets.UTF_8); 
//some case this will throw runtime exception
 int exitStatus = channel.getExitStatus(); 
}
 

 

So why the ChannelExec cannot get the correct channel status when remote node is rebooting?