[uml-user] UML: Get's stuck

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

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.

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 

with kind regards
thomas