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    SubjectRe: threshold_init_device/kobject_uevent_env oops
    On Fri, Jan 25, 2008 at 03:20:45PM -0800, Yinghai Lu wrote:
    > On Jan 25, 2008 3:08 PM, Greg KH <gregkh@suse.de> wrote:
    > > On Fri, Jan 25, 2008 at 11:35:56PM +0100, Ingo Molnar wrote:
    > ..
    > > Also, can someone enable CONFIG_KOBJECT_DEBUG and send me the output of
    > > the startup of this code? That should help explain what order things
    > > are happening it.
    >
    > Calling initcall 0xffffffff80ba1dee: threshold_init_device+0x0/0x3f()
    > kobject: 'threshold_bank4' (ffff8108265450c0): kobject_add_internal: parent: 'machinecheck0', set: '<NULL>'
    > kobject: 'misc0' (ffff810425497418): kobject_add_internal: parent: 'threshold_bank4', set: '<NULL>'
    > kobject: 'misc1' (ffff810425497498): kobject_add_internal: parent: 'threshold_bank4', set: '<NULL>'
    > kobject: 'misc2' (ffff810425497518): kobject_add_internal: parent: 'threshold_bank4', set: '<NULL>'
    > Unable to handle kernel NULL pointer dereference at 0000000000000018 RIP: [<ffffffff8045d443>] kobject_uevent_env+0x31/0x45f

    2 of these work just fine, and the third blows up in kobject_uevent().
    So wierd, let me dig further...

    Hm, it's when we unwind that we blow up on the kobject_uevent, as that's
    the first time it is called (gotta love recursion here...) So it is
    really never working for these objects at all, what a mess.

    As a work-around for now, you can probably just comment out the
    'kobject_uevent() in the file arch/x86/kernel/cpu/mcheck/mcd_amd_64.c
    and everything should work just fine, as there never really was an event
    being properly generated before, no one would miss it now :)

    I'll keep digging...

    thanks,

    greg k-h


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