Re: [uml-user] UML: Get's stuck

[Thomas M. <th...@m3...>]

Am Mittwoch, den 06.11.2013, 13:40 +0100 schrieb Richard Weinberger:
> On Tue, Nov 5, 2013 at 9:21 PM, Thomas Meyer <th...@m3...> wrote:
> > Hi,
> >
> > I'm running Fedora 20 inside a 3.12 UML kernel and the "yum upgrade -y"
> > command seems to get stuck after a while/few minutes.
> >
> > Any ideas what's going one here? How to debug this?
> >
> > It looks like the process running yum is in state ptrace stopped, but
> > doesn't continue.
> 
> Got only yum stuck or the whole UML kernel?

How to tell? It feels like the whole kernel got stuck.

> Does yum a ptrace() within UML or did you observe that from the outside?

I saw it from outside in below process listing.

> 
> > The process tree looks also strange:
> >
> > 20330 pts/3    S+     1:18  |   \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20337 pts/3    S+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20338 pts/3    S+     0:03  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20339 pts/3    S+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20347 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20405 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20469 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20615 pts/3    S+     0:00  |       \_ xterm -T Virtual Console #1 (fedora20) -e port-helper -uml-socket /tmp/xterm-pipeiW6d5k
> > 20625 ?        Ss     0:00  |       |   \_ port-helper -uml-socket /tmp/xterm-pipeiW6d5k
> > 20626 ?        Zs     0:00  |       \_ [linux] <defunct>
> > 20630 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20642 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20650 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20651 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20663 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20681 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20684 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20690 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20691 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20699 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20709 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20722 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20754 pts/3    S+     0:00  |       \_ xterm -T Virtual Console #2 (fedora20) -e port-helper -uml-socket /tmp/xterm-pipetxRIbS
> > 20757 ?        Ss     0:00  |       |   \_ port-helper -uml-socket /tmp/xterm-pipetxRIbS
> > 20755 pts/3    S+     0:00  |       \_ xterm -T Virtual Console #6 (fedora20) -e port-helper -uml-socket /tmp/xterm-pipedhXmGp
> > 20762 ?        Ss     0:00  |       |   \_ port-helper -uml-socket /tmp/xterm-pipedhXmGp
> > 20758 ?        Zs     0:00  |       \_ [linux] <defunct>
> > 20760 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20763 ?        Zs     0:00  |       \_ [linux] <defunct>
> > 20797 pts/3    S+     0:00  |       \_ xterm -T Virtual Console #3 (fedora20) -e port-helper -uml-socket /tmp/xterm-pipeULItXd
> > 20812 ?        Ss     0:00  |       |   \_ port-helper -uml-socket /tmp/xterm-pipeULItXd
> > 20813 ?        Zs     0:00  |       \_ [linux] <defunct>
> > 20815 pts/3    S+     0:00  |       \_ xterm -T Virtual Console #5 (fedora20) -e port-helper -uml-socket /tmp/xterm-pipeaKUbD3
> > 20876 ?        Ss     0:00  |       |   \_ port-helper -uml-socket /tmp/xterm-pipeaKUbD3
> > 20877 ?        Zs     0:00  |       \_ [linux] <defunct>
> > 20896 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 20909 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21005 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21007 pts/3    Z+     0:00  |       \_ [uml_net] <defunct>
> > 21019 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21112 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21125 pts/3    Z+     0:00  |       \_ [uml_net] <defunct>
> > 22164 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22211 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22224 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22380 pts/3    t+     0:51  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21965 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21968 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 21983 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22053 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22058 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> > 22887 pts/3    t+     0:00  |       \_ ./linux ubd0=ext3fs.img mem=768M systemd.unit=multi-user.target umid=fedora20
> 
> Remain the tasks in state Z or are they fipping around?

All process remain in thier state. nothing seems to happen any more.

> Maybe the UML userspace creates many threads and on the host side UML
> didn't call wait() jet...

I don't think so. yum is probably not a big thread user, I guess.

> 
> >
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