The SSH console is timing out and I'm not able to execute any commands.

I've noticed that I can execute commands remotely but when I try to allocate TTY it hangs:


$ ssh root@example.com "uname -a"
Linux example.com 2.6.32-504.el6.x86_64 #1 SMP Tue Sep 16 01:56:35 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux


$ ssh -t root@example.com "uname -a"
$ ssh root@example.com "dmesg"
tty_ldisc_hangup: waiting (sshd) for pts1 took too long, but we keep waiting...
  • OS: RHEL 6.6
  • Kernel: kernel-2.6.32-504.el6.x86_64
  • Since you can execute commands, it would help a lot if you'd use that to look at the sshd log file. – Jenny D Dec 1 '14 at 10:13
  • I've checked the SSHD log and I don't see any specific errors that could be related to this issue. – HTF Dec 1 '14 at 10:21
  • HTF: Check ssh -t $server frgep -e 'sshd[' /var/log/auth.log / @JennyD – Charles Stewart Dec 1 '14 at 10:21
  • Which file to look at will depend on how the server is configured. It may be /var/log/secure, or /var/log/auth.log. Also /var/log/syslog and/or /var/log/messages may be interesting. – Jenny D Dec 1 '14 at 10:23
  • @HTF One thing you can try in order to get a console is to login and run an X-based terminal program. E.g. ssh -t root@example.com xterm (or gnome-terminal, or urxvt, or whatever terminal program you may have.) Once you've got a terminal going you can troubleshoot things easier. – Jenny D Dec 1 '14 at 10:27

It looks like the problem was related to hpsa module shipped with kernel kernel-2.6.32-504.el6.x86_64.

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