[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
I'm going to mark this 'wont fix' in cloud-initramfs-tools. and take away cloud-init. ** No longer affects: cloud-init (Ubuntu) ** Changed in: cloud-initramfs-tools (Ubuntu) Status: Triaged => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
** Also affects: cloud-init (Ubuntu) Importance: Undecided Status: New ** Changed in: cloud-init (Ubuntu) Status: New => Triaged ** Changed in: cloud-init (Ubuntu) Importance: Undecided => Low ** Description changed: I'd very much like to use the official cloud images from cloud- images.ubuntu.com on the Brightbox cloud, but I can never get them to boot properly in KVM. If the disk is resized then the VM always crashes with a kernel panic. Process is as follows: On a Precise Host running libvirt. - wget http://cloud-images.ubuntu.com/quantal/current/quantal-server-cloudimg-amd64-disk1.img - sudo cp quantal-server-cloudimg-amd64-disk1.img /var/lib/libvirt/images/test.img - sudo qemu-img resize /var/lib/libvirt/images/test.img 20G - virsh create test.xml If you view the console in virt-manager you'll find that the kernel has panicked on the disk remount after resizing. Issuing a 'virsh reset srv-7867c' causes the boot to progress normally. Similarly if the disk isn't resized the boot progresses normally. You get the same problem with: - all the standard images - with varying degrees of feedback in the failure message. - using the RHEL6 version of libvirt and kvm - if you remove the virtio from the disk stanza and replace with ide emulation. Any ideas? Related bugs: - * bug 1122245: booting from a cloud image hangs until virsh console is used - * bug 1061977: Machine fails to commission when console=ttyS0 is present on kernel opts + * bug 1122245: booting from a cloud image hangs until virsh console is used + * bug 1061977: Machine fails to commission when console=ttyS0 is present on kernel opts + * bug 1016695: add console=tty1 to cloud-image kernel boot parameters ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: cloud-initramfs-growroot 0.4ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-37.58-virtual 3.2.35 Uname: Linux 3.2.0-37-virtual x86_64 ApportVersion: 2.0.1-0ubuntu17.1 Architecture: amd64 Date: Tue Feb 12 15:48:19 2013 MarkForUpload: True PackageArchitecture: all SourcePackage: cloud-initramfs-tools UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
I'm adding a email thread that I had with smb, apw, and slangasek. It discusses the issue and potential solutions in some detail. ** Attachment added: "email thread discussion" https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+attachment/3570563/+files/lp-1123220-mails.mime -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
It seems to me that 'echo hi mom' from the initramfs (or from an upstart job
with 'output console') should never result in failure. This is failing in the
above situation because the kernel cmdline has 'console=tty1 console=ttyS0' on
it, but ttyS0 is not a valid device.
So, it seems the following are potential fixes to the issue:
a.) kernel doing better sanity checking on console= argument and not attaching
/dev/console to something that is going to fail
b.) initramfs and upstart verifying that /dev/console can be written to, and
if not, then redirecting output to somewhere that *is* writable (possibly /run/
or /dev/null).
Clearly, i could change cloud-initramfs-growroot to not fail when it
fails to write to its stdout, but that seems not a general fix.
For initramfs, we could do something very early in the initramfs like
this:
if ! echo "initramfs running" > /dev/console; then
read cmdline < /proc/cmdline
consoles=""
for tok in $cmdline; do
[ ${tok#console=} != ${tok} ] || continue;
tok=${tok#console=}; tok=${tok%,*};
# reverse order on cmdline
consoles="$tok $consoles";
done
failed=""
found=""
for console in $consoles; do
dev="/dev/${console#/dev}"
echo "initramfs running" > "$dev" &&
found=$dev && break ||
failed="${failed:+${failed}$dev}"
done
if [ -n "$found" ]; then
exec > "$found" 2>&1
else
exec > "/run/initramfs.log" 2>&1
fi
echo "WARN: Failed write to /dev/console${failed:+ and ${failed}}"
fi
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https://bugs.launchpad.net/bugs/1123220
Title:
cloud-image VM causes kernel panic if image is resized
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[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
Oh, and there is more information on bug 1061977, where I attempted to do 'a' as a solution, or find a way to re-assign /dev/console from user- space. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
above, it seems it'd make good sense to write the warning to /dev/kmsg also. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
I'm going to mark this 'low', as the work around is easy: attach a serial device. ** Changed in: cloud-initramfs-tools (Ubuntu) Importance: Undecided => Low ** Changed in: cloud-initramfs-tools (Ubuntu) Status: New => Triaged ** Description changed: I'd very much like to use the official cloud images from cloud- images.ubuntu.com on the Brightbox cloud, but I can never get them to boot properly in KVM. If the disk is resized then the VM always crashes with a kernel panic. Process is as follows: On a Precise Host running libvirt. - wget http://cloud-images.ubuntu.com/quantal/current/quantal-server-cloudimg-amd64-disk1.img - sudo cp quantal-server-cloudimg-amd64-disk1.img /var/lib/libvirt/images/test.img - sudo qemu-img resize /var/lib/libvirt/images/test.img 20G - virsh create test.xml If you view the console in virt-manager you'll find that the kernel has panicked on the disk remount after resizing. Issuing a 'virsh reset srv-7867c' causes the boot to progress normally. Similarly if the disk isn't resized the boot progresses normally. You get the same problem with: - all the standard images - with varying degrees of feedback in the failure message. - using the RHEL6 version of libvirt and kvm - if you remove the virtio from the disk stanza and replace with ide emulation. Any ideas? + Related bugs: + * bug 1122245: booting from a cloud image hangs until virsh console is used + * bug 1061977: Machine fails to commission when console=ttyS0 is present on kernel opts + ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: cloud-initramfs-growroot 0.4ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-37.58-virtual 3.2.35 Uname: Linux 3.2.0-37-virtual x86_64 ApportVersion: 2.0.1-0ubuntu17.1 Architecture: amd64 Date: Tue Feb 12 15:48:19 2013 MarkForUpload: True PackageArchitecture: all SourcePackage: cloud-initramfs-tools UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
This is really interesting. Its easily reproducible with: wget wget http://cloud-images.ubuntu.com/quantal/current/quantal-server-cloudimg-amd64-disk1.img -O disk.img qemu-img resize disk.img 20G kvm -serial none -drive file=disk.img,if=virtio -curses -m 256 The problem is "fixed", if you remove '-serial none' from the kvm cmdline, and thus get the default serial device that kvm appends. The original test.xml can be fixed in a similar manner by simply adding: It can also be fixed by mounting the image and removing 'console=ttyS0' from the kernel command lines in /boot/grub/grub.cfg. Its hard to see, because observing it makes it work. But, I suspect that the root of the problem is that cloud-initramfs-growpart is writing to stdout, which is redirected to /dev/console, and /dev/console writes are going to the non-existant device 'ttyS0' (as told to by the command line). Those writes are failing, and something is then leaving the disk in a bad state. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
** Tags added: cloud-images cloud-images-build -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
** No longer affects: ubuntu-on-ec2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
** Also affects: ubuntu-on-ec2 Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-on-ec2/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1123220] Re: cloud-image VM causes kernel panic if image is resized
** Attachment added: "test.xml" https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+attachment/3525523/+files/test.xml -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
