Hi everyone,
I have an application that utilizes JSCH 1.49 and am running into an
interesting scenario. We have a user of our application that is connecting to
a server, downloading some data, and at the end of the download, perhaps right
before reading the last packet, the process hangs indefinitely. Most of the
file is received, but some data is missing. I suspect that problem is caused
by the server as many other transfers within the same JVM run without fail
against many other servers, but sporadic connections to this server 'lock up'
and consume limited execution threads until the JVM is restarted. I've
attached the JSCH debug log and thread stack below.
Do you have any insight as to what might be causing this lockup? Or perhaps
what can be done to allow the local thread to timeout?
OS is RHEL
Linux 2.6.18-308.8.2.el5 (amd64)
Thread Stack
java.lang.Object wait (Native Method) Object.java Not
Available
com.jcraft.jsch.Session write Not Available Not
Available
com.jcraft.jsch.ChannelSftp sendREAD Not Available Not
Available
com.jcraft.jsch.ChannelSftp _get Not Available Not
Available
com.jcraft.jsch.ChannelSftp get Not Available Not
Available
Debug Log
9/10/13 3:15:12 AM DEBUG Connecting to ***.***.***.*** port 22
9/10/13 3:15:12 AM DEBUG Connection established
9/10/13 3:15:12 AM DEBUG Remote version string: SSH-2.0-1.82
sshlib: XroadsSftpServer
9/10/13 3:15:12 AM DEBUG Local version string:
SSH-2.0-JSCH_0.1.49
9/10/13 3:15:12 AM DEBUG CheckCiphers:
aes256-cbc,aes192-cbc,aes128-cbc,3des-cbc,blowfish-cbc,twofish256-cbc,twofish-cbc,twofish192-cbc,twofish128-cbc,serpent256-cbc,serpent192-cbc,serpent128-cbc,arcfour,idea-cbc,cast128-cbc,des-cbc,arcfour128,arcfour256,aes128-ctr,aes192-ctr,aes256-ctr,3des-ctr,blowfish-ctr,twofish128-ctr,twofish192-ctr,twofish256-ctr,serpent128-ctr,serpent192-ctr,serpent256-ctr,idea-ctr,cast128-ctr
9/10/13 3:15:12 AM DEBUG CheckKexes: diffie-hellman-group14-sha1
9/10/13 3:15:12 AM DEBUG diffie-hellman-group14-sha1 is not
available.
9/10/13 3:15:12 AM DEBUG SSH_MSG_KEXINIT sent
9/10/13 3:15:12 AM DEBUG SSH_MSG_KEXINIT received
9/10/13 3:15:12 AM DEBUG kex: server:
diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
9/10/13 3:15:12 AM DEBUG kex: server: ssh-dss
9/10/13 3:15:12 AM DEBUG kex: server:
aes256-cbc,twofish256-cbc,twofish-cbc,aes128-cbc,twofish128-cbc,blowfish-cbc,3des-cbc,arcfour,cast128-cbc
9/10/13 3:15:12 AM DEBUG kex: server:
hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96
9/10/13 3:15:12 AM DEBUG kex: server: zlib,none
9/10/13 3:15:12 AM DEBUG kex: client:
diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1
9/10/13 3:15:12 AM DEBUG kex: client: ssh-rsa,ssh-dss
9/10/13 3:15:12 AM DEBUG kex: client:
aes256-cbc,aes192-cbc,aes128-cbc,3des-cbc,blowfish-cbc,twofish256-cbc,twofish-cbc,twofish192-cbc,twofish128-cbc,serpent256-cbc,serpent192-cbc,serpent128-cbc,arcfour,idea-cbc,cast128-cbc,des-cbc,arcfour128,arcfour256,aes128-ctr,aes192-ctr,aes256-ctr,3des-ctr,blowfish-ctr,twofish128-ctr,twofish192-ctr,twofish256-ctr,serpent128-ctr,serpent192-ctr,serpent256-ctr,idea-ctr,cast128-ctr
9/10/13 3:15:12 AM DEBUG kex: client:
hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96
9/10/13 3:15:12 AM DEBUG kex: client: none,zlib
9/10/13 3:15:12 AM DEBUG kex: server->client aes256-cbc hmac-md5
none
9/10/13 3:15:12 AM DEBUG kex: client->server aes256-cbc hmac-md5
none
9/10/13 3:15:12 AM DEBUG SSH_MSG_KEXDH_INIT sent
9/10/13 3:15:12 AM DEBUG expecting SSH_MSG_KEXDH_REPLY
9/10/13 3:15:13 AM DEBUG ssh_dss_verify: signature true
9/10/13 3:15:13 AM DEBUG SSH_MSG_NEWKEYS sent
9/10/13 3:15:13 AM DEBUG SSH_MSG_NEWKEYS received
9/10/13 3:15:13 AM DEBUG SSH_MSG_SERVICE_REQUEST sent
9/10/13 3:15:13 AM DEBUG SSH_MSG_SERVICE_ACCEPT received
9/10/13 3:15:13 AM DEBUG Authentications that can continue:
publickey,password,keyboard-interactive
9/10/13 3:15:13 AM DEBUG Next authentication method: publickey
9/10/13 3:15:13 AM DEBUG Authentications that can continue:
password,keyboard-interactive
9/10/13 3:15:13 AM DEBUG Next authentication method: password
9/10/13 3:15:14 AM DEBUG Authentication succeeded (password).
9/10/13 3:15:15 AM DEBUG COMMAND: cd '/'
9/10/13 3:15:15 AM DEBUG REPLY: New working directory is '/'
9/10/13 3:15:15 AM DEBUG COMMAND: pwd
9/10/13 3:15:15 AM DEBUG REPLY: Current working directory is '/'
9/10/13 3:15:15 AM INFO Downloading '/prod_xrdint6_bai_091013'
to '/home/prod_xrdint6_bai_091013'
9/10/13 3:15:15 AM DEBUG COMMAND: get '/prod_xrdint6_bai_091013'
'/home/prod_xrdint6_bai_091013'
Thanks in advance!
ERICK LICHTAS
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