[Qemu-devel] [Bug 957622] Re: kvm -kernel with grub multiboot kernel dumps core or exits

[Scott Moser]

I'm pretty sure this is a bug in the linked commit above, in that it
does not account for this statement in the multiboot spec:

`load_end_addr'
     Contains the physical address of the end of the data segment.
     (load_end_addr - load_addr) specifies how much data to load.  This
     implies that the text and data segments must be consecutive in the
     OS image; this is true for existing a.out executable formats.  If
     this field is zero, the boot loader assumes that the text and data
     segments occupy the whole OS image file.

Specifically, "If this field is zero..."

** Also affects: qemu
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/957622

Title:
  kvm -kernel with grub multiboot kernel dumps core or exits

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  New

Bug description:
  I attempted to use kvm -kernel with a grub multiboot image,
  specifically grub-maverick-20100729.img at [1].  That file was built
  using [2]

  $ 
url="http://bazaar.launchpad.net/~ubuntu-on-ec2/vmbuilder/automated-ec2-builds/download/head:/grubmaverick20100729-20100729071944-bevge631maio9jpl-2/grub-maverick-20100729.img";
  $ wget $url -O grub-maverick-20100729.img
  $ qemu-kvm create -f qcow2 disk.img 1G
  $ kvm -curses -kernel grub-maverick-20100729.img -drive 
file=disk.img,if=virtio

  This process works fine on oneiric and you will see a curses
  interface, and some output of grub looking for a image to boot.

  On my laptop (with kvm support), I saw:

  $ kvm -curses -kernel grub-maverick-20100729.img -drive 
file=disk.img,if=virtio;
  fread() failed
  $ echo $?
  1

  On a kvm guest (via openstack instance), it crashed differently:
  $ kvm -curses -kernel grub-maverick-20100729.img -drive 
file=disk.img,if=virtio
  Could not access KVM kernel module: No such file or directory
  failed to initialize KVM: No such file or directory
  Back to tcg accelerator.

  GLib-ERROR **: /build/buildd/glib2.0-2.31.20/./glib/gmem.c:165: failed to 
allocate 4293918720 bytes
  Trace/breakpoint trap (core dumped)

  
  Just for a test, I tried loading kvm-amd, got nested kvm virtualization, but 
the instance fails the same way.

  
  --
  [1] 
http://bazaar.launchpad.net/~ubuntu-on-ec2/vmbuilder/automated-ec2-builds/files/head:/loaders/
  [2] 
http://bazaar.launchpad.net/~ubuntu-on-ec2/vmbuilder/automated-ec2-builds/view/head:/mk-image-mb-loader

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: kvm (not installed)
  ProcVersionSignature: User Name 3.2.0-18.29-virtual 3.2.9
  Uname: Linux 3.2.0-18-virtual x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  CurrentDmesg:
   [27230.320857] init: qemu-kvm pre-start process (8659) terminated with 
status 1
   [27230.361904] init: qemu-kvm post-stop process (8664) terminated with 
status 1
   [27249.426836] kvm[9021] trap int3 ip:7f44c2bbc13b sp:7fff447e1120 error:0
   [27263.380598] kvm[9283] trap int3 ip:7f3fba9f713b sp:7fff8b55d1a0 error:0
  Date: Sat Mar 17 01:48:13 2012
  Ec2AMI: ami-00000000
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: 
UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
  MachineType: Bochs Bochs
  ProcEnviron:
   TERM=screen
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-virtual 
root=LABEL=cloudimg-rootfs ro console=ttyS0
  ProcModules:
   acpiphp 24231 0 - Live 0x0000000000000000
   floppy 70365 0 - Live 0x0000000000000000
   psmouse 87603 0 - Live 0x0000000000000000
   serio_raw 13211 0 - Live 0x0000000000000000
   virtio_balloon 13108 0 - Live 0x0000000000000000
  SourcePackage: qemu-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: 
dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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