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Re: Detached screens disappear - help debugging?

From: Pandurangan R S
Subject: Re: Detached screens disappear - help debugging?
Date: Sat, 19 Dec 2009 07:35:52 +0530

May be this another possible reason then.

Q:      If I leave screen too long detached it mysteriously disappears,
although I feel that this is not a flaw in the program but rather my
system being 'cleaned' of stray jobs.
A:      Check the output of "screen -ls". If there is no session, your
shells inside screen possibly have set an autologout. This kills the
processes after a certain time of inactivity. Such a feature is often
installed per default in the users account, as it helps to keep
intruders off on terminals where you forgot to log out. But it is not
a good idea for shells running under screen.


On Sat, Dec 19, 2009 at 1:38 AM, Leinartas, Michael
<address@hidden> wrote:
> My screen sockets are actually in /var/run/screen/S-<user>/
> I can't find anything that would be clearing it (checked crons, logrotate, 
> etc).  When these screens disappear, both the SCREEN process and the socket 
> are gone. It seems almost like screen shuts itself down for some reason. If 
> it were shutting down uncleanly (say a crash or a kill -9) it'd leave behind 
> a socket, right?
> -----Original Message-----
> From: Pandurangan R S [mailto:address@hidden
> Sent: Wednesday, December 16, 2009 9:29 PM
> To: Leinartas, Michael
> Cc: address@hidden
> Subject: Re: Detached screens disappear - help debugging?
>>> After detaching, my screen session will disappear some time after.
> Is the screen process dead (check using ps) or you are not just able
> to attach to the screen.
> If the screen process is alive and "screen -ls" tells "No sockets found"
> then it may the case that your sockdir (usually /tmp/uscreens/<user>)
> is getting cleaned up!
> My admin was wiping off the entire /tmp when diskspace was low and
> this was causing me a similar issue.
> Regards
> Pandu
> On Wed, Dec 16, 2009 at 11:06 AM, Leinartas, Michael
> <address@hidden> wrote:
>> I've had a problem with screen on my home computer for quite some time
>> that's been driving me crazy.  After detaching, my screen session will
>> disappear some time after.  Sometimes an hour later it's there, sometimes
>> it's not.  It's nearly always gone if I leave it overnight.  I never have
>> any problems if I'm attached - if I say, leave a screen session on the
>> console open for 3 days, it'll be fine. It also doesn't seem to matter how
>> many terminals are in the session or whether they're idle at a prompt or
>> running something.
>> So where can I start figuring out what's causing these sessions to die?  It
>> doesn't  seem to be anything obvious like an oom killer (nothing in dmesg).
>>  I've checked the system crons in /etc/cron.* and it doesn't look like
>> there's anything wiping stuff in /var/run or anything.
>> Some system details incase it matters to anyone:
>> Screen 4.0.3
>> Debian squeeze (same problem when I was on lenny) amd64 arch
>> linux-2.6.32 (vanilla)
>> AMD quad core (Phenom II)
>> 4gb ram
>> I'd appreciate any help on this because it's driving me nuts.
>> michael
>> _______________________________________________
>> screen-users mailing list
>> address@hidden

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