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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: ssh-agent doesn't die
Date: Fri, 27 Sep 2019 15:09:13 +0000
Message-ID: <a2581894-fea4-fd71-ffbc-b16dbeb671d9@cornell.edu>
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On 9/27/2019 10:27 AM, Vanda Vodkamilkevich wrote:
> Le ven. 27 sept. 2019 à 16:13, Ken Brown <kbrown AT cornell DOT edu> a écrit :
> 
>> On 9/27/2019 9:37 AM, Norton Allen wrote:
>>> On 9/26/2019 10:50 PM, Ken Brown wrote:
>>>>
>>>>> As a simple test example, consider:
>>>>>
>>>>> /bin/ssh-agent /bin/sleep 10
>>>>>
>>>>> While the sleep is still running, ps shows:
>>>>>
>>>>>          PID    PPID    PGID     WINPID   TTY         UID    STIME
>> COMMAND
>>>>>         1694    1693    1694       1576  ?          22534 00:01:10
>>>>> /usr/bin/ssh-agent
>>>>>         1653       1    1653      11740  cons1      22534 00:00:37
>> /usr/bin/bash
>>>>>         1693    1653    1693       1552  cons1      22534 00:01:10
>> /usr/bin/sleep
>>>>>
>>>>> One oddity is that ssh-agent is listed as a subprocess of sleep
>>>> ...but this isn't a bug.  ssh-agent forks, and then the parent execs
>> the command.
>>>
>>> With the salient difference presumably being that the exec is done in
>> the parent
>>> instead of the child as usual?
>>
>> Yes.  The idea is that 'ssh-agent command' should be more-or-less
>> equivalent to
>> running 'command', with ssh-agent running as a subprocess.
>>
>> The ssh-agent subprocess periodically checks to see if its parent is still
>> alive, and it exits when the parent has died.  Someone should figure out
>> why
>> this is not working on Cygwin.
> 
> Hi,
> this may probably be not fully related but I see from time to time a
> strange behavior of ssh-agent (running in the background and initially
> started by keychain launched in .bashrc) : the agent is running wild (25%
> of cpu and never responding). It seems to occur (not systematically) when
> network is disconnected and reconnected (this is on a laptop often removed
> from the docking system). Do you have any idea how to diagnose the issue
> more precisely?

Sorry, but I'm not an expert on ssh-agent.  Everything I said above is based on 
doing an internet search and looking briefly at the ssh-agent source code.

My only suggestion would be to attach gdb to the process when it starts running 
wild and see if you can figure out why it's inf-looping.  If you don't know how 
to do this, someone who does know would have to be able to reproduce the problem.

Ken

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