[Xen-users] XENBUS: Timeout connecting to device: device/vbd/51712 (local state 3, remote state 1)

[Stephen Kent <smkent@xxxxxxxxxx>]

I just upgraded my computer from an old kernel (2.6.34-xen) to 3.6.11, and upgraded Xen to 4.2.0. I can't seem to get my domU to boot, as it can't find the root filesystem.

I've compiled a domU kernel (also 3.6.11) with xen-blkfront built-in and set the domU config file with this disk configuration:

disk = [ 'file:/home/data/xen/megatron/root.img,xvda,w' ]

(The disk is just a file with an ext3 filesystem, I can mount it on loopback in dom0)

After I xl start my domU, xl block-list in dom0 shows the device connected to the domU but the domU kernel (with root=/dev/xvda) can't find the root filesystem:

[...]

XENBUS: Timeout connecting to device: device/vbd/51712 (local state 3, remote state 1)

console [netcon0] enabled

netconsole: network logging started

ALSA device list:

 No soundcards found.

md: Waiting for all devices to be available before autodetect

md: If you don't use raid, use raid=noautodetect

md: Autodetecting RAID arrays.

md: Scanned 0 and added 0 devices.

md: autorun ...

md: ... autorun DONE.

VFS: Cannot open root device "xvda" or unknown-block(0,0): error -6

Please append a correct "root=" boot option; here are the available partitions:

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Pid: 1, comm: swapper/0 Not tainted 3.6.11-gentoo #8

Call Trace:

Â[<ffffffff815c59ff>] ? panic+0xc5/0x1cc

Â[<ffffffff815c5bd9>] ? printk+0x4c/0x51

Â[<ffffffff819990cd>] ? mount_block_root+0x1d4/0x1f2

Â[<ffffffff8108ebaa>] ? lg_local_lock+0x11/0x14

Â[<ffffffff81002930>] ? kvm_io_bus_sort_cmp+0x1c/0x27

Â[<ffffffff8110fcf8>] ? sys_mknodat+0x12c/0x140

Â[<ffffffff8199920f>] ? mount_root+0x124/0x12b

Â[<ffffffff81999d8f>] ? initrd_load+0x303/0x309

Â[<ffffffff8199937e>] ? prepare_namespace+0x168/0x19e

Â[<ffffffff81998702>] ? kernel_init+0x17f/0x191

Â[<ffffffff8199852b>] ? parse_early_options+0x2a/0x2a

Â[<ffffffff815cf644>] ? kernel_thread_helper+0x4/0x10

Â[<ffffffff815c8338>] ? retint_restore_args+0x5/0x6

Â[<ffffffff815cf640>] ? gs_change+0x13/0x13

I don't see any earlier kernel messages about the Xen block frontend driver loading. Am I missing a kernel option or something? I'm not sure what else to try.

Thanks!

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