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

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

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

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-- 
Thanks,
//richard