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    SubjectRe: WARN... Device 'cpu1' does not have a release() function, it is broken and must be fixed. when doing 'xl vcpu-set <guest_id> 1'
    Date
    I created a Bugzilla entry at 
    https://bugzilla.kernel.org/show_bug.cgi?id=42683
    for your bug report, please add your address to the CC list in there, thanks!

    On poniedziałek, 23 stycznia 2012 o 19:06:01 Konrad Rzeszutek Wilk wrote:
    > When I bring a CPU down in a guest (which should be the same as bringing a
    > CPU down using the ACPI framework), I get this:
    >
    > [ 14.484206] SMP alternatives: switching to UP code
    > [ 14.514287] ------------[ cut here ]------------
    > [ 14.514318] WARNING: at /home/konrad/linux-linus/drivers/base/core.c:194
    > device_release+0x82/0x90() [ 14.514354] Device 'cpu1' does not have a
    > release() function, it is broken and must be fixed. [ 14.514386] Modules
    > linked in: radeon fbcon tileblit font ttm bitblit softcursor
    > drm_kms_helper xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt
    > sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd [ 14.514557] Pid:
    > 22, comm: xenwatch Not tainted 3.3.0-rc1 #1
    > [ 14.514586] Call Trace:
    > [ 14.515094] [<ffffffff810897fa>] warn_slowpath_common+0x7a/0xb0
    > [ 14.515094] [<ffffffff810898d1>] warn_slowpath_fmt+0x41/0x50
    > [ 14.515094] [<ffffffff813dea02>] device_release+0x82/0x90
    > [ 14.515094] [<ffffffff812dfb85>] kobject_release+0x45/0x90
    > [ 14.515094] [<ffffffff812dfa4c>] kobject_put+0x2c/0x60
    > [ 14.515094] [<ffffffff813de6a2>] put_device+0x12/0x20
    > [ 14.515094] [<ffffffff813df409>] device_unregister+0x19/0x20
    > [ 14.515094] [<ffffffff813e4edf>] unregister_cpu+0x4f/0x80
    > [ 14.515094] [<ffffffff81052c7c>] arch_unregister_cpu+0x1c/0x20
    > [ 14.515094] [<ffffffff8137f787>] handle_vcpu_hotplug_event+0xc7/0xd0
    > [ 14.515094] [<ffffffff8137b900>] xenwatch_thread+0xb0/0x180
    > [ 14.515094] [<ffffffff810ad3f0>] ? wake_up_bit+0x40/0x40
    > [ 14.515094] [<ffffffff8137b850>] ? split+0xf0/0xf0
    > [ 14.515094] [<ffffffff810acd16>] kthread+0x96/0xa0
    > [ 14.515094] [<ffffffff816151e4>] kernel_thread_helper+0x4/0x10
    > [ 14.515094] [<ffffffff8160cc80>] ? retint_restore_args+0x5/0x6
    > [ 14.515094] [<ffffffff816151e0>] ? gs_change+0x13/0x13
    > [ 14.515094] ---[ end trace 8f70af51a2e2611f ]---
    >
    > Looking at "commit e032d80774315869aa2285b217fdbbfed86c0b49
    > Author: Greg Kroah-Hartman <gregkh@suse.de>
    > Date: Mon Jan 16 14:40:28 2012 -0800
    >
    > mce: fix warning messages about static struct mce_device
    > "
    >
    > it looks like the corret fix is to make the 'cpu_devices' in
    > arch/x86/kernel/topology.c to be changed to be more dynamic
    > (or perhaps have an empty release function)?
    >
    > Is anybody else hitting this with ACPI CPU hot-unplug? Or do I have
    > the privilige of being the first? Oh, I hadn't done a full bisection
    > but v3.2 does not have this.
    >
    > The guest config is quite simple:
    > extra="console=hvc0 debug earlyprintk=xen memblock=debug"
    > kernel="/mnt/lab/bootstrap-x86_64/vmlinuz"
    > ramdisk="/mnt/lab/bootstrap-x86_64/initramfs.cpio.gz"
    > memory=1024
    > maxmem=2048
    > vcpus=2
    > name="bootstrap-x86_64"
    > on_crash="preserve"
    > vfb = [ 'vnc=1, vnclisten=0.0.0.0,vncunused=1']
    > --
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    Maciej Rutecki
    http://www.mrutecki.pl
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