Date: Wed, 19 Mar 2014 10:00:26 -0300 From: Marcelo Gondim <gondim@bsdinfo.com.br> To: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: sshd with zombie process on FreeBSD 10.0-STABLE - workaround Message-ID: <532994EA.9090300@bsdinfo.com.br> In-Reply-To: <53298445.90706@bsdinfo.com.br> References: <53016D97.5030909@bsdinfo.com.br> <53066B59.5000709@yandex.ru> <531A6C66.2010101@bsdinfo.com.br> <CAPJF9wnVOYjTXB0A1wyzwvCj-Tvx_u2uYLW72-wDuz-QZpwT4w@mail.gmail.com> <53298445.90706@bsdinfo.com.br>
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Hi all,
While the solution does not appear, did the script below and put it in
crontab to automatically delete zombie sshd processes.
the_walking_dead.sh:
#!/bin/sh
kill -9 `ps afx|grep sshd|grep unknown|awk '{print $1}'`
Put this in /etc/crontab:
00 1 * * * root the_walking_dead.sh
Em 19/03/14 08:49, Marcelo Gondim escreveu:
> Em 11/03/14 05:45, Alexander Yerenkow escreveu:
>> Could you try to change shell to simple "sh" and see if this helps?
>> This could be due to non-atomic work with history file when multiple
>> clients log off, causing csh produce large broken history files.
>> This is not 100% your case, but you could at least try :)
> Changed to shand the problem happened again.
> Definitely something changed in sshd since version 10.0that is causing
> this problem.
> My server never had zombie processes and now they sprout out of
> nowhere. :(
>>
>>
>> 2014-03-08 3:03 GMT+02:00 Marcelo Gondim <gondim@bsdinfo.com.br
>> <mailto:gondim@bsdinfo.com.br>>:
>>
>> Em 20/02/14 17:53, Andrey V. Elsukov escreveu:
>>
>> On 17.02.2014 06:01, Marcelo Gondim wrote:
>>
>> Hi all,
>>
>> I have noticed zombie processes on the system after a few
>> lost
>> connections on ssh.
>>
>> # ps afx
>> [...]
>> 8045 - Is 0:00.01 sshd: unknown [priv] (sshd)
>> 8046 - Z 0:00.01 <defunct>
>> 8054 - IW 0:00.00 sshd: unknown [pam] (sshd)
>> 28146 - Is 0:00.01 sshd: unknown [priv] (sshd)
>> 28147 - Z 0:00.01 <defunct>
>> 28155 - IW 0:00.00 sshd: unknown [pam] (sshd)
>> 43320 - Is 0:00.01 sshd: unknown [priv] (sshd)
>> 43321 - Z 0:00.01 <defunct>
>> 43322 - IW 0:00.00 sshd: unknown [pam] (sshd)
>> 73413 - Is 0:00.01 sshd: unknown [priv] (sshd)
>> 73414 - Z 0:00.01 <defunct>
>> 73430 - IW 0:00.00 sshd: unknown [pam] (sshd)
>> [...]
>>
>> Processes do not die with kill-9.
>> Anyone else noticed this?
>>
>> Hi,
>>
>> I use autossh and usually my system has several tens of sshd's
>> zombies
>> after few days uptime.
>>
>> 11.0-CURRENT #6 r262183
>>
>> New system update and the problem with zombie sshd processes
>> continue.
>> I noticed that this happens more often when the system has many
>> remote access via ssh. This problem has been happening to me since
>> the FreeBSD 10.0R.
>>
>> # uname -a
>> FreeBSD bart.xxxxx.com.br <http://bart.xxxxx.com.br>; 10.0-STABLE
>> FreeBSD 10.0-STABLE #5 r262657: Tue Mar 4 14:53:08 BRT 2014
>> root@bart.xxxxx.com.br:/usr/obj/usr/src/sys/GONDIM10 amd64
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