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hefe
n00b
Joined: 18 Aug 2004
Posts: 58
Location: Germany
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 Posted: Sat Feb 11, 2006 10:31 am Post subject: /etc/init.d/nfs start delays ssh logout? |
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Hi there!
I wonder if anyone else saw this happen. I see this for months over much kernel updates and nfs versions. To reproduce it, just:
* log into a gentoo box
* and su to root
* and run /etc/init.d/nfs start
* logout of su
* logout the normal user
-> watch that this ssh logout is seriously delayed
Hint: if you would skip one of the above steps, you could not reproduce this problem.
Here is like it shows up for me:
| Code: | hefe@anfortas ~ $ ssh trevrizent
Last login: Sat Feb 11 10:20:26 2006 from trevrizent
hefe@trevrizent ~ $ su
Password:
trevrizent hefe # /etc/init.d/nfs start
* Starting portmap ... [ ok ]
* Mounting nfsd filesystem in /proc ... [ ok ]
* Starting NFS statd ... [ ok ]
* Exporting NFS directories ... [ ok ]
* Starting NFS daemon ... [ ok ]
* Starting NFS mountd ... [ ok ]
trevrizent hefe # exit
exit
hefe@trevrizent ~ $ exit
logout
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At this point it hangs for about a few minutes...
| Code: |
Connection to trevrizent closed.
hefe@anfortas ~ $
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The questions are:
* Has anyone else the same problem?
* Is it ssh, is it the nfs script?
Hope someone can help with tips where to go from here... |
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m8ryx
n00b
Joined: 24 Nov 2004
Posts: 23
Location: Portland, OR, USA
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| Posted: Sat Feb 11, 2006 10:37 pm Post subject: |
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a few questions:
1) does it recur on subsequent logins (with nfs already running)?
2) have you tried a a verbose ssh (ssh -v, or ssh -vv), and what does it say when you logout?
3) is the client gentoo also? Make sure that you're running relatively similar verisions of ssh/sshd on the boxes.
4) is UseDNS enables in your sshd_config?
5) are any relevant directories exported by NFS, including your CWD, /tmp, or your home directory?
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hefe
n00b
Joined: 18 Aug 2004
Posts: 58
Location: Germany
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| Posted: Sun Feb 12, 2006 10:15 pm Post subject: |
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answers:
1) it occurs only if you start nfs
2) it happens if there is at least one entry in /etc/exports
3) the logout is delayed if i logout just after the startscript
4) UseDNS is commented out on the server
5) it happens if i export a normal directory. i dont export /home or / or /tmp
| Code: |
hefe@anfortas ~ $ ssh -V
OpenSSH_4.2p1, OpenSSL 0.9.7i 14 Oct 2005
hefe@anfortas ~ $ ssh -v trevrizent
OpenSSH_4.2p1, OpenSSL 0.9.7i 14 Oct 2005
debug1: Reading configuration data /home/hefe/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to trevrizent [172.16.70.1] port 22.
debug1: Connection established.
debug1: identity file /home/hefe/.ssh/identity type -1
debug1: identity file /home/hefe/.ssh/id_rsa type 1
debug1: identity file /home/hefe/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.2
debug1: match: OpenSSH_4.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'trevrizent' is known and matches the RSA host key.
debug1: Found key in /home/hefe/.ssh/known_hosts:8
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/hefe/.ssh/identity
debug1: Offering public key: /home/hefe/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Offering public key: /home/hefe/.ssh/id_dsa
debug1: Server accepts key: pkalg ssh-dss blen 433
debug1: read PEM private key done: type DSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Requesting X11 forwarding with authentication spoofing.
Last login: Sun Feb 12 22:56:54 2006 from anfortas
hefe@trevrizent ~ $ su
Password:
trevrizent hefe # /etc/init.d/nfs stop
* Stopping NFS mountd ... [ ok ]
* Stopping NFS daemon ... [ ok ]
* Stopping NFS statd ... [ ok ]
trevrizent hefe # cat /etc/exports
# /etc/exports: NFS file systems being exported. See exports(5).
#/mnt/mp3store 172.16.70.4(rw,async,mp,no_root_squash)
#/mnt/oldmp3s 172.16.70.4(rw,async,mp)
#/mnt/ftp 172.16.70.4(rw,async,mp)
/mnt/halde 172.16.70.4(rw,async,mp,no_root_squash)
#/mnt/backup 172.16.70.4(rw,async,mp,no_root_squash)
#/mnt/halde 172.16.70.10(rw,async,mp)
#/mnt/winD 172.16.70.4(rw,async,mp)
#/mnt/winC 172.16.70.4(rw,async,mp)
trevrizent hefe # cat /etc/ssh/sshd_config | grep DNS
#UseDNS yes
trevrizent hefe # ssh -V
OpenSSH_4.2p1, OpenSSL 0.9.7e 25 Oct 2004
trevrizent hefe # exit
hefe@trevrizent ~ $ debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
logout
debug1: channel 0: free: client-session, nchannels 1
Connection to trevrizent closed.
debug1: Transferred: stdin 0, stdout 0, stderr 34 bytes in 41.9 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.8
debug1: Exit status 0
hefe@anfortas ~ $
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In the above example the logout is not delayed (because i did /etc/init.d/nfs stop)
| Code: |
hefe@anfortas ~ $ ssh -v trevrizent
OpenSSH_4.2p1, OpenSSL 0.9.7i 14 Oct 2005
debug1: Reading configuration data /home/hefe/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to trevrizent [172.16.70.1] port 22.
debug1: Connection established.
debug1: identity file /home/hefe/.ssh/identity type -1
debug1: identity file /home/hefe/.ssh/id_rsa type 1
debug1: identity file /home/hefe/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.2
debug1: match: OpenSSH_4.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'trevrizent' is known and matches the RSA host key.
debug1: Found key in /home/hefe/.ssh/known_hosts:8
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Trying private key: /home/hefe/.ssh/identity
debug1: Offering public key: /home/hefe/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Offering public key: /home/hefe/.ssh/id_dsa
debug1: Server accepts key: pkalg ssh-dss blen 433
debug1: read PEM private key done: type DSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Requesting X11 forwarding with authentication spoofing.
Last login: Sun Feb 12 23:00:11 2006 from anfortas
hefe@trevrizent ~ $ su
Password:
trevrizent hefe # /etc/init.d/nfs stop
* ERROR: "nfs" has not yet been started.
trevrizent hefe # /etc/init.d/nfs start
* Starting NFS statd ... [ ok ]
* Exporting NFS directories ... [ ok ]
* Starting NFS daemon ... [ ok ]
* Starting NFS mountd ... [ ok ]
trevrizent hefe # exit
hefe@trevrizent ~ $ debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
logout
debug1: channel 0: free: client-session, nchannels 1
Connection to trevrizent closed.
debug1: Transferred: stdin 0, stdout 0, stderr 34 bytes in 45.1 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.8
debug1: Exit status 0
hefe@anfortas ~ $
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Here the logout hangs.
In the above examples i used ctrl+D to logout, but the delay occurs aswell if i use exit. If i wait or do something else before logout the delay does not occur. And it does not occur if i comment out all entries in /etc/exports.
Both boxes are gentoo and the thing occurs vice versa. |
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m8ryx
n00b
Joined: 24 Nov 2004
Posts: 23
Location: Portland, OR, USA
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| Posted: Sun Feb 26, 2006 2:51 am Post subject: |
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well, I'm still not sure what's causing the hang (I can reproduce it starting or stopping the nfs server). However, you can workaround the problem somewhat using the ssh escape sequence '~.' (tilde then period).
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