Red Hat Bugzilla – Full Text Bug Listing
|Summary:||nohup job is killed when ssh times out|
|Product:||[Fedora] Fedora||Reporter:||Sammy <umar>|
|Component:||coreutils||Assignee:||Ondrej Vasik <ovasik>|
|Status:||CLOSED WONTFIX||QA Contact:||Fedora Extras Quality Assurance <extras-qa>|
|Version:||8||CC:||kdudka, ovasik, twaugh|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2009-01-09 01:48:04 EST||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Sammy 2008-10-19 11:27:27 EDT
This has been an ongoing issue for a while now. It involves the following components: nohup, ssh, kernel, openmp. When one starts a job remotely using nohup and normally logs out (ctrl-D) the job stays running. However, if you do not logout and let ssh time out the job is killed. The situation is more interesting on a multi-processor machine when running an openmp job. In this case it seems to kill all but one of the threads and the job keeps running on a single cpu. I am surprised this has not been reported earlier since I have been aware of it for many months now. If you feel that this is a problem with "ssh" please change the ownership. Thanks.
Comment 1 Kamil Dudka 2008-11-06 08:57:57 EST
Created attachment 322714 [details] dummy job Is there any way to easy reproduce this behavior? My experiment: In the 1st terminal: $ ssh root@xen89 # tailf /var/log/secure & In the 2nd terminal: $ ssh xen89 $ nohup ./bigjob.sh # bigjob.sh is attached In the 3rd terminal: $ kill -s SIGSTOP 24366 # pid of ssh client in 2nd terminal In the 1st terminal: # ps -A | grep bigjob.sh >/dev/null && echo job is running job is running Nov 6 14:49:17 xen89 sshd: Timeout, client not responding. # ps -A | grep bigjob.sh >/dev/null && echo job is running job is running Note that without nohup the job is killed after timeout. So in this example it seems to work for me. Could you please do this experiments on your machine? Can you give in this way a simple example where this fails?
Comment 2 Sammy 2008-11-07 09:32:37 EST
This only happens when I login from home into my office Desktop PC. Both running Fedora 8+all updates and both x86_64. When I run locally ssh never seems to time out. $ssh compsci $nohup big_job& At this point if I do ctrl-D and logout job keeps running. If I do nothing after a while session times out and connection is lost. If you ssh back in job is killed. NOTE: The big_job is an OpenMP job running on 4 processors. Could this make a diffference?
Comment 3 Kamil Dudka 2008-11-07 09:51:31 EST
(In reply to comment #2) > This only happens when I login from home into my office Desktop PC. Both > running Fedora 8+all updates and both x86_64. When I run locally ssh never > seems to time out. Locally means ssh localhost? I am able to cause timeout even on localhost, try to set ClientAliveInterval in /etc/ssh/sshd_config to few seconds, (restart sshd), connect with ssh and then send SIGSTOP to ssh process. > NOTE: The big_job is an OpenMP job running on 4 processors. Could this > make a difference? Maybe. Could you send me the big_job binary? or its sources if license requires it :-) or just another program which helps me to reproduce this issue...
Comment 4 Bug Zapper 2008-11-26 06:14:50 EST
This message is a reminder that Fedora 8 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 8. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '8'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 8's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 8 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Comment 5 Bug Zapper 2009-01-09 01:48:04 EST
Fedora 8 changed to end-of-life (EOL) status on 2009-01-07. Fedora 8 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.