Public bug reported:

9.3.189.114 (root/.pasroot) (Host Machine)
Run the follwoing command to go to the guest victim machine from 
(/var/lib/libvirt/images/jagan/new_ubuntu_alpha1)

qemu-system-ppc64 -enable-kvm -M pseries -cpu POWER8 -smp 1 -m 10G
-nographic -nodefaults -monitor stdio -serial pty -append
"root=/dev/sda" -kernel trusty-server-cloudimg-ppc64el-vmlinuz-generic
-device spapr-vscsi -device spapr-vlan,netdev=net0,mac=6c:ae:8b:69:16:15
-netdev bridge,br=virbr0,id=net0 -drive file=trusty-server-cloudimg-
ppc64el.img.qcow2

after this command you will get the screen number.
example:

QEMU 1.6.0 monitor - type 'help' for more information
(qemu) char device redirected to /dev/pts/16 (label serial0)

Then open another host session and execute the below command

# screen /dev/pts/16
(qemu)

Here the screen number is /dev/pts/16

-->>Then you will get a blank screen so press ENTER key.

The guest machine login: ubuntu/passw0rd

Then do --->sudo -i

Environment:
===========
Host: Power8
Guest : ubuntu hosted on Power8

The issue:
======
After logging into the guest some times it becomes read - only file system.

Description:
===========

Here i am not able to create directory or a file.

root@ubuntu:/opt/ltp# cat /etc/issue
Ubuntu Trusty Tahr (development branch) \n \l=====================>>ubuntu guest

root@ubuntu:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 6c:ae:8b:69:16:15
          inet addr:192.168.122.131  Bcast:192.168.122.255  Mask:255.255.255.0
          inet6 addr: fe80::6eae:8bff:fe69:1615/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:72 errors:0 dropped:4 overruns:0 frame:0
          TX packets:43 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:6764 (6.7 KB)  TX bytes:3914 (3.9 KB)
          Interrupt:22

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)


root@ubuntu:/opt/ltp# ./runltp -f timers -p -l timers.log -o timers.out
cat: /opt/ltp/Version: No such file or directory
INFO: creating /opt/ltp/results directory
mktemp: failed to create directory via template â/tmp/ltp-XXXXXXXXXXâ: 
Read-only file system======>>error
FATAL: Unable to make temporary directory:

root@ubuntu:/opt/ltp# df -k
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda        51573372 1303052  47632556   3% /
none                   4       0         4   0% /sys/fs/cgroup
devtmpfs         5161908     296   5161612   1% /dev
none             1032440     184   1032256   1% /run
none                5120       0      5120   0% /run/lock
none             5162192       0   5162192   0% /run/shm
none              102400       0    102400   0% /run/user

root@ubuntu:/opt/ltp# mkdir -m 777 jagan
mkdir: cannot create directory âjaganâ: Read-only file system========>>error

root@ubuntu:/opt/ltp# touch jagan
touch: cannot touch âjaganâ: Read-only file system============>>error

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: ppc64el

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https://bugs.launchpad.net/bugs/1267712

Title:
  ubuntu guest's file system becoming read only

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