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[Shrinivas <shrikltc@xxxxxxxxx>]

Seen same Read-Only file system issue after upgrading kernel from
3.13.0-0-generic to 3.13.0-5-generic.

After kernel upgrade Guest OS system goes into Read-Only mode.


As soon as I log in from console system throws Read-Only system error :


[root@localhost ~]# virsh console shri_ubuntu_alpha1
Connected to domain shri_ubuntu_alpha1
Escape character is ^]


Ubuntu Trusty Tahr (development branch) ubuntu hvc0

ubuntu login: ubuntu
Password: 
Unable to setup logging. [Errno 30] Read-only file system: '/var/log/landscape/sysinfo.log'
run-parts: /etc/update-motd.d/50-landscape-sysinfo exited with return code 1
/usr/lib/update-notifier/update-motd-fsck-at-reboot: 33: /usr/lib/update-notifier/update-motd-fsck-at-reboot: cannot create /var/lib/update-notifier/fsck-at-reboot: Read-only file system  
                                                                                                                   <------------------------- Read-Only FS
ubuntu@ubuntu:~$ 


ubuntu@ubuntu:~$ uname -a
Linux ubuntu 3.13.0-5-generic #20-Ubuntu SMP Mon Jan 20 20:03:57 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux
ubuntu@ubuntu:~$ 
ubuntu@ubuntu:~$

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

Title:
  ubuntu guest's file system becoming read only

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  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

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