Have just triggered this oops - as far as I can remember this did not occur with -mm1 (I can't be sure) but it does occur with -mm2. I'd just plugged in a USB modem using cdc-acm and then got up from under the desk to notice this on the console.
Thanks, Reuben
Mar 16 19:44:40 tornado kernel: usb 1-1: new full speed USB device using address 2
Mar 16 19:44:41 tornado kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000005
Mar 16 19:44:41 tornado kernel: printing eip:
Mar 16 19:44:41 tornado kernel: e0c68a78
Mar 16 19:44:41 tornado kernel: *pde = 00000000
Mar 16 19:44:41 tornado kernel: Oops: 0000 [#1]
Mar 16 19:44:41 tornado kernel: PREEMPT
Mar 16 19:44:41 tornado kernel: CPU: 0
Mar 16 19:44:41 tornado kernel: EIP: 0060:[<e0c68a78>] Not tainted VLI
Mar 16 19:44:41 tornado kernel: EFLAGS: 00010246 (2.6.4-mm2)
Mar 16 19:44:41 tornado kernel: EIP is at acm_probe+0x68/0x4e0 [cdc_acm]
Mar 16 19:44:41 tornado kernel: eax: 00000000 ebx: c9650ee0 ecx: d49e0780 edx: de1a2380
Mar 16 19:44:41 tornado kernel: esi: debd4d60 edi: 00000000 ebp: ddbb8c00 esp: c15e1e04
Mar 16 19:44:41 tornado kernel: ds: 007b es: 007b ss: 0068
Mar 16 19:44:41 tornado usb.agent[14092]: ... no modules for USB product 6ea/2/100
Mar 16 19:44:41 tornado kernel: Process khubd (pid: 5, threadinfo=c15e0000 task=dff90030)
Mar 16 19:44:41 tornado kernel: Stack: dd737a40 c15e1e48 dd737a40 00000000 dd9169a0 00000292 dd9169a0 dffe6200
Mar 16 19:44:41 tornado kernel: c016859f dd9169a0 000081a4 dffe6200 c0168e70 d4d866c0 000081a4 00000000
Mar 16 19:44:41 tornado kernel: de1a2380 e0c6a520 debd4d60 ffffffed debd4dcc c0247505 e0c6a540 debd4d74
Mar 16 19:44:41 tornado kernel: Call Trace:
Mar 16 19:44:41 tornado kernel: [<c016859f>] alloc_inode+0x11f/0x140
Mar 16 19:44:41 tornado kernel: [<c0168e70>] new_inode+0x20/0xa0
Mar 16 19:44:41 tornado kernel: [<c0247505>] usb_probe_interface+0x55/0x80
Mar 16 19:44:41 tornado kernel: [<c01fd2f2>] bus_match+0x32/0x70
Mar 16 19:44:41 tornado kernel: [<c01fd37a>] device_attach+0x4a/0xb0
Mar 16 19:44:41 tornado kernel: [<c0166547>] dput+0x87/0x290
Mar 16 19:44:41 tornado kernel: [<c01fd554>] bus_add_device+0x54/0x90
Mar 16 19:44:41 tornado kernel: [<c01fc50c>] device_add+0x9c/0x140
Mar 16 19:44:41 tornado kernel: [<c024d94f>] usb_set_configuration+0x1bf/0x250
Mar 16 19:44:41 tornado kernel: [<c024852d>] usb_new_device+0x26d/0x3b0
Mar 16 19:44:41 tornado kernel: [<c0249e47>] hub_port_connect_change+0x1b7/0x290
Mar 16 19:44:41 tornado kernel: [<c024a02e>] hub_events+0x10e/0x360
Mar 16 19:44:41 tornado kernel: [<c024a2cf>] hub_thread+0x4f/0x100
Mar 16 19:44:41 tornado kernel: [<c01180b0>] default_wake_function+0x0/0x10
Mar 16 19:44:41 tornado kernel: [<c024a280>] hub_thread+0x0/0x100
Mar 16 19:44:41 tornado kernel: [<c0104ced>] kernel_thread_helper+0x5/0x18
Mar 16 19:44:41 tornado kernel:
Mar 16 19:44:41 tornado kernel: Code: 75 e5 8b 44 bb 10 e8 a8 ed 5d df 85 c0 75 d8 8b 54 bb 0c 8b 4e 04 39 f2
0f 84 d4 00 00 00 39 74 bb 10 75 c3 8b 42 04 89 54 24 40 <80> 78 05 0a 75 b6 80 78 04 01 76 b0 8b 49 0c 89 4c
24 3c 8b 40
Mar 16 19:49:21 tornado ifup-ppp: pppd started for ppp0 on /dev/usb/ttyACM0 at 115200
Mar 16 19:49:21 tornado pppd[14173]: pppd 2.4.1 started by root, uid 0
Mar 16 19:49:21 tornado pppd[14173]: Using interface ppp0
Mar 16 19:49:21 tornado pppd[14173]: local IP address 10.64.64.64
Mar 16 19:49:21 tornado pppd[14173]: remote IP address 10.112.112.112
(END)
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