This is output of jstack
"Daemon of host 229 (ip = xxxxxxxx )" daemon prio=10 tid=0x08359400
nid=0x108b sleeping[0xb2c9a000..0xb2c9afb0]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at com.jcraft.jsch.Session.write(Session.java:1159)
at com.jcraft.jsch.Request.write(Request.java:58)
at com.jcraft.jsch.RequestExec.request(RequestExec.java:55)
at com.jcraft.jsch.ChannelExec.start(ChannelExec.java:43)
at com.jcraft.jsch.Channel.connect(Channel.java:221)
at net.prominic.jnetmon.SshDaemon.exec(SshDaemon.java:621)
at net.prominic.jnetmon.SshDaemon.runCommand(SshDaemon.java:776)
at net.prominic.jnetmon.SingleCommandSshCollector.run
(SingleCommandSshCollector.java:250)
at net.prominic.jnetmon.SshDaemon.runCollector(SshDaemon.java:855)
at net.prominic.jnetmon.DaemonTimerTask.runDaemonTask
(DaemonTimerTask.java:63)
at net.prominic.jnetmon.DaemonTimerTask.run(DaemonTimerTask.java:38)
at net.prominic.jnetmon.timer.TimerThread.mainLoop
(MonitorTimer.java:653)
at net.prominic.jnetmon.timer.TimerThread.run(MonitorTimer.java:589)
The full output it quite long, this host (229) is one of the stuck hosts.
So I think this is what you need.
Once it is stuck, output of jstack always looks like this, it seems that it
is always running Session.java:1159
Pan
From: y...@jcraft.com (Atsuhiko Yamanaka)
To: pa...@prominic.net
Cc: jsch-users@lists.sourceforge.net
Date: 2009/06/15 13:58
Subject: Re: [JSch-users] NPE and infinite loop under (very) high work load
Hi,
Thank you for your feedback,
+-From: Pan Li <pa...@prominic.net> ------
|_Date: Mon, 15 Jun 2009 13:42:01 +0800 __
|
|Each ssh session runs in its own thread. We thought it was a dead lock
in
|our code. We used jstack to find out the deadlock. But jstack didn't
find
|any deadlock, it shown that the thread was running the same lines in
|Session.java. That was how we figured out the problem.
Is it possible to send me the output from jstack?
Sincerely,
--
Atsuhiko Yamanaka
JCraft,Inc.
1-14-20 HONCHO AOBA-KU,
SENDAI, MIYAGI 980-0014 Japan.
Tel +81-22-723-2150
+1-415-578-3454
Skype callto://jcraft/
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