Linux 2.6.5-rc2 BUG: NULL pointer dereference in khubd

Linux 2.6.5-rc2 BUG: NULL pointer dereference in khubd

[Ben Castricum]

I got the error below after upgrading from 2.6.5-rc1 to 2.6.5-rc2.

This is on a Asus MEW mainboard (intel 810 chipset), kernel compiled with
gcc version 2.95.3 20010315 (release).
I can supply more info in required.

I hope this helps,
Ben

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Real Time Clock Driver v1.12
drivers/usb/core/usb.c: registered new driver usbfs
drivers/usb/core/usb.c: registered new driver hub
USB Universal Host Controller Interface driver v2.2
uhci_hcd 0000:00:1f.2: Intel Corp. 82801AA USB
PCI: Setting latency timer of device 0000:00:1f.2 to 64
uhci_hcd 0000:00:1f.2: irq 9, io base 0000a400
uhci_hcd 0000:00:1f.2: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
drivers/usb/core/usb.c: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.23:USB Abstract Control Model driver for USB
modems and ISDN adapters
hw_random hardware driver 1.0.0 loaded
usb 1-2: new full speed USB device using address 2
Unable to handle kernel NULL pointer dereference at virtual address 00000005
 printing eip:
c8860954
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
CPU:    0
EIP:    0060:[<c8860954>]    Not tainted
EFLAGS: 00010246   (2.6.5-rc2)
EIP is at acm_probe+0x9c/0x51c [cdc_acm]
eax: c7ac8cc0   ebx: 00000000   ecx: c7da0b80   edx: 00000000
esi: c770ed6c   edi: 00000004   ebp: c7ac8dc0   esp: c7b3be3c
ds: 007b   es: 007b   ss: 0068
Process khubd (pid: 37, threadinfo=c7b3a000 task=c7b3d760)
Stack: c8861d40 ffffffed c7ac8dd4 c7ac8dc0 c7b17300 c02908f0 00000000
00000001
       c029a3cc c0173a7c c7b17300 c029a3e0 c7ac8cc0 c770ed60 c12d2c00
c888d049
       c7ac8dc0 c8861c80 ffffffed c8861d40 c7ac8dd4 c12d2cd0 c8861d20
c01d06f1
Call Trace:
 [<c0173a7c>] sysfs_add_file+0x5c/0x7c
 [<c888d049>] usb_probe_interface+0x41/0x5c [usbcore]
 [<c01d06f1>] bus_match+0x31/0x54
 [<c01d076a>] device_attach+0x56/0x8c
 [<c01d08e8>] bus_add_device+0x50/0x88
 [<c01cfa48>] device_add+0x88/0x118
 [<c01cfae9>] device_register+0x11/0x18
 [<c8892653>] usb_set_configuration+0x1bb/0x1f4 [usbcore]
 [<c888dd93>] usb_new_device+0x2d3/0x370 [usbcore]
 [<c0117330>] printk+0x12c/0x154
 [<c888f3c6>] hub_port_connect_change+0x1ce/0x254 [usbcore]
 [<c888f57d>] hub_events+0x131/0x2dc [usbcore]
 [<c888f755>] hub_thread+0x2d/0xe4 [usbcore]
 [<c888f728>] hub_thread+0x0/0xe4 [usbcore]
 [<c0113abc>] default_wake_function+0x0/0x1c
 [<c0104e75>] kernel_thread_helper+0x5/0xc

Code: 80 7a 05 0a 0f 85 52 04 00 00 80 7a 04 01 0f 86 48 04 00 00
 <6>8139too Fast Ethernet driver 0.9.27
PCI: Enabling device 0000:01:08.0 (0004 -> 0007)
eth0: RealTek RTL8139 at 0xc8866000, 00:50:fc:85:89:e0, IRQ 12
eth0:  Identified 8139 chip type 'RTL-8100B/8139D'
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