Hello all,
I'm booting a CentOS kernel under today's KVM git and it hangs after
initializing the serial port when the drive if=virtio, but not when
drive if=ide. Look close---this is not a "forgot to add virtio_blk"
problem. If I use 0.12.3 from Ubuntu 10.04 it works properly.
Reproduction:
Using kvm 0.12.3 on ubuntu 10.04 (1:84+dfsg-0ubuntu16+0.12.3+noroms
+0ubuntu9) it will work properly:
qemu-system-x86_64 -drive file=dummy-disk-image,if=virtio \
-kernel vmlinuz-2.6.18-194.3.1.el5.centos.plus
As expected, the kernel panics unable to mount root (good-boot.png).
This makes sense, as "dummy-disk-image" is 1MB of 0x00 bytes.
---However---if I use today's git (2010-07-01) of kvm:
/usr/local/kvm-git/bin/qemu-system-x86_64 -drive
file=dummy-disk-image,if=virtio \
-kernel vmlinuz-2.6.18-194.3.1.el5.centos.plus
This hangs just after initializing the Serial device (obtained by adding
-serial stdio -append console=ttyS0):
Note that this only happens with the disk interface set to virtio
(if=virtio). It works fine for ide (if=ide).
Am I doing something wrong here?
Is anyone else having this problem?
The pictures, disk and kernel image is available here:
http://www.portlandlinuxsupport.com/src/kvm-20100701-regression/
-Eric
More detail:
==== snip ==== (see also bad-boot.png)
PCI: PIIX3: Enabling Passive Release on 0000:00:01.0
Activating ISA DMA hang workarounds.
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
Real Time Clock Driver v1.12ac
Non-volatile memory driver v1.2
Linux agpgart interface v0.101 (c) Dave Jones
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
[[ hangs here and spins at >100% cpu ]]
==== snip ====
And the qemu-system-x86_64 process spins at >100% cpu:
== snip from top ==
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
8895 root 20 0 287m 28m 3124 S 102 0.5 0:56.82 qemu-system-x86
== snip from top ==
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