[Bug 1411294] Re: kernel panic during MAAS fastpath install of Vivid images

[Scott Moser]

fix uploaded.
just for some more information, can fairly easily reproduce this bug using a cloud image:

img_url="http://cloud-images.ubuntu.com/daily/server/vivid/current/vivid-server-cloudimg-amd64-disk1.img"                                                       
img_dl="${img_url##*/}"                                                         
wget -O "$img_dl" "$img_url"                                                    
qemu-img convert -O qcow2 "$img_dl" "disk.img.dist"                             
qemu-img create -f qcow2 -b disk.img.dist disk.img                              

# pull out kernel/initramfs                                                  
sudo mount-image-callback disk.img --read-only -- \                             
   sh -xc 'cp $MOUNTPOINT/boot/vmlinu?-* kernel &&                              
           cp $MOUNTPOINT/boot/initrd.* initrd &&                               
           chmod ugo+r kernel initrd'

# boot qemu, should boot to bash prompt, currently on vivid (3.18 + 0.25ubuntu1) will kernel panic
qemu-system-x86_64 -enable-kvm -m 1024 \                                        
   -drive if=virtio,file=disk.img \                                             
   -kernel kernel -initrd initrd \                                              
   -append "root=LABEL=cloudimg-rootfs overlayroot=tmpfs:debug=1 console=ttyS0 init=/bin/bash" \                                                                
   -nographic -echr 0x5    

# patchin a new deb
sudo mount-image-callback disk.img -- \                                         
   sh -exc '                                                                    
     deb=$1; shift;                                                             
     cp $deb $MOUNTPOINT/tmp/fix.deb                                            
     chroot $MOUNTPOINT dpkg -i /tmp/fix.deb                                    
     rm $MOUNTPOINT/tmp/fix.deb' -- overlayroot_0.26ubuntu1_all.deb  

# then re-copy out the kernel and boot again to see fix.

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https://bugs.launchpad.net/bugs/1411294

Title:
  kernel panic during MAAS fastpath install of Vivid images

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