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    SubjectRe: KVM-AMD OOPS
    Avi Kivity wrote:
    > Jeremy Fitzhardinge wrote:
    >> Sasa Ostrouska wrote:
    >>> root@rcserver:~# modprobe kvm-amd
    >>> int3: 0000 [1] PREEMPT SMP
    >>> CPU 1
    >>> Modules linked in: kvm_amd snd_seq_dummy snd_seq_oss
    >>> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
    >>> nls_iso8859_1 ntfs nls_base usb_storage libusual capability commoncap
    >>> lp psmouse snd_hda_intel snd_hda_codec snd_pcm snd_timer ohci_hcd
    >>> ehci_hcd 8139too rtc_cmos snd soundcore snd_page_alloc usbcore k8temp
    >>> mii rtc_core rtc_lib i2c_nforce2 parport_pc parport
    >>> Pid: 2898, comm: modprobe Tainted: P #1
    >>> RIP: 0010:[<ffffffff80572364>] [<ffffffff80572364>]
    >>> register_cpu_notifier+0x1/0x31
    >>> RSP: 0000:ffff81006e34df40 EFLAGS: 00000246
    >>> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000c0010117
    >>> RDX: 000000000000ffff RSI: ffff81006e219640 RDI: ffffffff80536510
    >>> RBP: ffffffff880d8840 R08: 0000000000000000 R09: 000000000006b5f4
    >>> R10: 0000000000000000 R11: 0000000000000000 R12: 00000000005296b0
    >>> R13: 00007fff51fe55c0 R14: 0000000000000000 R15: 0000000000000000
    >>> FS: 00002b4e58e18b00(0000) GS:ffff810002e794c0(0000)
    >>> knlGS:0000000000000000
    >>> CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    >>> CR2: 000000000050df64 CR3: 000000007a0f3000 CR4: 00000000000006e0
    >>> Process modprobe (pid: 2898, threadinfo ffff81006e34c000, task
    >>> ffff81007bc48400)
    >>> Stack: ffffffff8039e024 ffff81006e34c000 ffffffff880d8840
    >>> 0000000000005e19
    >>> ffffffff8024537c 0000000000000000 00007fff51fe50c0 00000000004142d0
    >>> ffffffff8020967e 0000000000000206 00000000005230e0 000000000052f4c9
    >>> Call Trace:
    >>> [<ffffffff8039e024>] kvm_init_arch+0x90/0x145
    >>> [<ffffffff8024537c>] sys_init_module+0xad/0x168
    >>> [<ffffffff8020967e>] system_call+0x7e/0x83
    >>> Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
    >> This is the init section poison pattern. Looks like an init function
    >> was used after the code was freed.
    > Indeed, the function is register_cpu_notifier which is declared
    > __cpuinit, which, without hotplug compiled in, is simply __init.
    > I'll prepare a patch for this. Meanwhile, you can work around it by
    > enabling CONFIG_HOTPLUG_CPU.

    Well, this nice patch (in 2.6.21) ought to have fixed it:

    commit 47e627bc8c9a70392d2049e6af5bd55fae61fe53
    Author: Avi Kivity <>
    Date: Mon Feb 12 00:54:43 2007 -0800

    [PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU

    The following patchset allows a host with running virtual machines to be
    suspended and, on at least a subset of the machines tested, resumed. Note
    that this is orthogonal to suspending and resuming an individual guest to a

    A side effect of implementing suspend/resume is that cpu hotplug is now
    supported. This should please the owners of big iron.

    This patch:

    KVM wants the cpu hotplug notifications, both for cpu hotplug itself, but more
    commonly for host suspend/resume.

    In order to avoid extensive #ifdefs, provide stubs when CONFIG_CPU_HOTPLUG is
    not defined.

    In all, we have four cases:

    - UP: register and unregister stubbed out
    - SMP+hotplug: full register and unregister
    - SMP, no hotplug, core: register as __init, unregister stubbed
    (cpus are brought up during core initialization)
    - SMP, no hotplug, module: register and unregister stubbed out
    (cpus cannot be brought up during module lifetime)

    Signed-off-by: Avi Kivity <>
    Cc: Ingo Molnar <>
    Cc: Rusty Russell <>
    Cc: Oleg Nesterov <>
    Signed-off-by: Andrew Morton <>
    Signed-off-by: Linus Torvalds <>

    diff --git a/include/linux/cpu.h b/include/linux/cpu.h
    index bfb5202..769ddc6 100644
    --- a/include/linux/cpu.h
    +++ b/include/linux/cpu.h
    @@ -49,10 +49,20 @@ struct notifier_block;

    #ifdef CONFIG_SMP
    /* Need to know about CPUs going up/down? */
    -extern int register_cpu_notifier(struct notifier_block *nb);
    +extern int register_cpu_notifier(struct notifier_block *nb);
    extern void unregister_cpu_notifier(struct notifier_block *nb);
    +#ifndef MODULE
    +extern int register_cpu_notifier(struct notifier_block *nb);
    +static inline int register_cpu_notifier(struct notifier_block *nb)
    + return 0;
    static inline void unregister_cpu_notifier(struct notifier_block *nb)

    Please post your .config.

    error compiling committee.c: too many arguments to function

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      Last update: 2007-07-09 14:05    [W:0.033 / U:3.464 seconds]
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