Re: 2.6.32.1: BUG and panic: unable to handle kernel NULL pointer dereference at 000000000000001f

[Peter Palfrader]

On Tue, 22 Dec 2009, Andi Kleen wrote:

> > [    5.304749] BUG: unable to handle kernel NULL pointer dereference at 000000000000001f
> > ..
> > [    5.308739] Call Trace:
> > [    5.308739]  [<ffffffff810c3840>] kstrdup+0x40/0x70
> > [    5.308739]  [<ffffffff81150d77>] sysfs_new_dirent+0xf7/0x110
> > [    5.308739]  [<ffffffff8115121d>] create_dir+0x3d/0xc0
> > [    5.308739]  [<ffffffff81090af1>] ? autoremove_wake_function+0x11/0x40
> > [    5.308739]  [<ffffffff811512d4>] sysfs_create_dir+0x34/0x50
> > [    5.308739]  [<ffffffff8138e7ea>] ? kobject_get+0x1a/0x30
> > [    5.308739]  [<ffffffff8138e961>] kobject_add_internal+0xe1/0x1e0
> > [    5.308739]  [<ffffffff8138eb78>] kobject_add_varg+0x38/0x60
> > [    5.308739]  [<ffffffff8138ec15>] kobject_init_and_add+0x75/0x90
> > [    5.308739]  [<ffffffff81150560>] ? sysfs_ilookup_test+0x0/0x20
> > [    5.308739]  [<ffffffff8115082d>] ? sysfs_find_dirent+0x2d/0x40
> > [    5.308739]  [<ffffffff81150ec1>] ? sysfs_addrm_finish+0x21/0x250
> > [    5.308739]  [<ffffffff8138e7ea>] ? kobject_get+0x1a/0x30
> > [    5.308739]  [<ffffffff810e6fe4>] ? kmem_cache_alloc+0x84/0xc0
> > [    5.308739]  [<ffffffff814238d4>] bus_add_driver+0x94/0x260
> > [    5.308739]  [<ffffffff81424ed9>] driver_register+0x79/0x160
> > [    5.308739]  [<ffffffff815a28a3>] __hid_register_driver+0x43/0x80
> > [    5.308739]  [<ffffffff81a3d7ff>] ? gyration_init+0x0/0x1b
> > [    5.308739]  [<ffffffff81a3d818>] gyration_init+0x19/0x1b
> 
> Seems to be caused by the "gyration driver" whatever that is. Do you
> have such a USB device?  

Doubtful.

> It could be some module mismatch, it looks suspicious
> and from a quick look the gyration driver does nothing bad 
> in that init path. Try a make clean and remove/rebuild/reinstall all the modules
> on the target system.
> 
> If that doesn't help perhaps disable CONFIG_HID_GYRATION,
> but from your other oops something more seems to be broken anyways.

This is a static kernel - no module support.  Anyway, I also tried
without CONFIG_USB_HID (which pulls in all the other HID_* things) but
no luck.

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