Re: [Qemu-discuss] Boot fail after compiling the Kernel.

[Bandan Das]

> On Jul 28, 2016, at 10:16 PM, John Y. <address@hidden> wrote:
> 
> Hi, 
> 
> I have a centos 5.8 guest with 2.6.18 kernel.
> I compiled the kernel 2.6.35.4 and boot from it.
> 
> (It could boot successfully in my labtop, but fail in guest created by 
> qemu-kvm)
> But I get errors:
> 
> 
> Kernel panic - not syncing : Attempted to kill the idle task!
> Pid :0, comm: swapper Tainted: G           D             2.6.35..4#2
> Call Trace:
>  [<c043127c>] ? panic+0x50/0xc1
>  [<c0433df8>] ? do_exit+0x5b/0x2b3
>  [<c069c1ed>] ? opps_end+0x90/0x94
>  [<c069beea>] ? do_general_protection+0x0/0x106
>  [<c069b8b6>] ? error_code+0x66/0x6c
>  [<c069beea>] ? do_general_protection+0x0/0x106
>  [<c08680b0>] ? intel_pmu_init+0x110/0x2c3
>  [<c086828d>] ? init_hw_perf_events+0x2a/0x27d
>  [<c0867e73>] ? check_bugs+0x5/0x2e
>  [<c08618b0>] ? start_kernel+0x21b/0x227
> 
> 
> Mylibvirt.xml:
> 
> <domain type='kvm' id='160'>
>   <name>i-centos5</name>
>   <uuid>d5e33a85-33d7-41e8-b68f-c87b87986f50</uuid>
>   <memory unit='KiB'>1048576</memory>
>   <currentMemory unit='KiB'>1048576</currentMemory>
>   <vcpu placement='static'>4</vcpu>
>   <resource>
>     <partition>/machine</partition>
>   </resource>
>   <os>
>     <type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
>     <boot dev='hd'/>
>     <boot dev='cdrom'/>
>   </os>
>   <features>
>     <acpi/>
>   </features>
>   <cpu mode='host-passthrough’/>


Unless you have a specific reason to use passthrough, you can try a specific 
cpu model. That will not expose pmu to the guest.

>   <clock offset='localtime'/>
>   <on_poweroff>destroy</on_poweroff>
>   <on_reboot>restart</on_reboot>
>   <on_crash>destroy</on_crash>
>   <devices>
>     <emulator>/usr/libexec/qemu-kvm</emulator>
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='qcow2'/>
>       <source file='/root/yaowj/i-centos5/snap2.qcow2'/>
>       <backingStore type='file' index='1'>
>         <format type='raw'/>
>         <source file='/home/centos5.qcow2'/>
>         <backingStore/>
>       </backingStore>
>       <target dev='vda' bus='virtio'/>
>       <alias name='virtio-disk0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' 
> function='0x0'/>
>     </disk>
>     <controller type='usb' index='0' model='ich9-ehci1'>
>       <alias name='usb'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
> function='0x7'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci1'>
>       <alias name='usb'/>
>       <master startport='0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
> function='0x0' multifunction='on'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci2'>
>       <alias name='usb'/>
>       <master startport='2'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
> function='0x1'/>
>     </controller>
>     <controller type='usb' index='0' model='ich9-uhci3'>
>       <alias name='usb'/>
>       <master startport='4'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
> function='0x2'/>
>     </controller>
>     <controller type='pci' index='0' model='pci-root'>
>       <alias name='pci.0'/>
>     </controller>
>     <interface type='bridge'>
>       <mac address='fa:16:3e:81:00:01'/>
>       <source bridge='eucabr'/>
>       <target dev='vnet0'/>
>       <model type='virtio'/>
>       <driver name='qemu'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' 
> function='0x0'/>
>     </interface>
>     <serial type='pty'>
>       <source path='/dev/pts/7'/>
>       <target port='0'/>
>       <alias name='serial0'/>
>     </serial>
>     <console type='pty' tty='/dev/pts/7'>
>       <source path='/dev/pts/7'/>
>       <target type='serial' port='0'/>
>       <alias name='serial0'/>
>     </console>
>     <input type='tablet' bus='usb'>
>       <alias name='input0'/>
>     </input>
>     <input type='mouse' bus='ps2'/>
>     <input type='keyboard' bus='ps2'/>
>     <graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0' 
> keymap='en-us'>
>       <listen type='address' address='0.0.0.0'/>
>     </graphics>
>     <video>
>       <model type='cirrus' vram='16384' heads='1'/>
>       <alias name='video0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02' 
> function='0x0'/>
>     </video>
>     <memballoon model='virtio'>
>       <alias name='balloon0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' 
> function='0x0'/>
>     </memballoon>
>   </devices>
> </domain>
> 
> 
> 
> /usr/libexec/qemu-kvm --version
> QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-105.el7_2.3), Copyright (c) 
> 2003-2008 Fabrice Bellard
> 
> 
> host:
> uname -a
> Linux gcloud38122 4.2.0-1.el7.elrepo.x86_64 #1 SMP Sun Aug 30 21:25:29 EDT 
> 2015 x86_64 x86_64 x86_64 GNU/Linux
> 
> 
> 
> How can I boot from a new kernel?
> 
> Thanks,
> John