We're also currently encountering this particular bug, find dmesg output below. The kernel currently installed is:
# uname -a Linux server 2.6.32-5-686 #1 SMP Mon Jun 13 04:13:06 UTC 2011 i686 GNU/Linux I already prepared the installation of 3.2.x from squeeze‹backports but I have still to boot that kernel: # dpkg -l |grep linux-image ii linux-image-2.6-686 2.6.32+29 Linux 2.6 for modern PCs (meta-package) ii linux-image-2.6.32-5-686 2.6.32-41 Linux 2.6.32 for modern PCs ii linux-image-3.2.0-0.bpo.1-486 3.2.1-2~bpo60+1 Linux 3.2 for older Pcs dmesg below: [15109890.316055] usb 3-2: new low speed USB device using uhci_hcd and address 28 [15109890.507953] usb 3-2: New USB device found, idVendor=051d, idProduct=0002 [15109890.508038] usb 3-2: New USB device strings: Mfr=3, Product=1, SerialNumber=2 [15109890.508102] usb 3-2: Product: Back-UPS 500 FW: 6.4.I USB FW: c1 [15109890.508153] usb 3-2: Manufacturer: American Power Conversion [15109890.508204] usb 3-2: SerialNumber: BB0321000060 [15109890.511344] usb 3-2: configuration #1 chosen from 1 choice [15109891.033138] generic-usb 0003:051D:0002.0004: hiddev0,hidraw0: USB HID v1.00 Device [American Power Conversion Back-UPS 500 FW: 6.4.I USB FW: c1 ] on usb-0000:00:1d.1-2/input0 [15110038.520079] usb 3-2: USB disconnect, address 28 [15110038.567356] BUG: unable to handle kernel NULL pointer dereference at (null) [15110038.567501] IP: [<d1620af7>] hiddev_ioctl+0x26/0x56f [usbhid] [15110038.567604] *pde = 00000000 [15110038.567695] Oops: 0000 [#2] SMP [15110038.567818] last sysfs file: /sys/devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/0003:051D:0002.0004/h idraw/hidraw0/uevent [15110038.567891] Modules linked in: usbhid hid xt_multiport tun ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 ipt_REJECT xt_tcpudp xt_state nf_conntrack iptable_filter ip_tables x_tables loop snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm i915 drm_kms_helper i2c_i801 snd_timer drm i2c_algo_bit snd i2c_core psmouse soundcore dcdbas snd_page_alloc parport_pc shpchp video evdev output parport button serio_raw pci_hotplug rng_core pcspkr processor ext3 jbd mbcache sg sr_mod sd_mod crc_t10dif cdrom ata_generic ata_piix uhci_hcd libata floppy thermal 3c59x ehci_hcd scsi_mod mii usbcore nls_base thermal_sys [last unloaded: scsi_wait_scan] [15110038.570508] [15110038.570558] Pid: 16828, comm: apcupsd Tainted: G D (2.6.32-5-686 #1) Dimension 2400 [15110038.570624] EIP: 0060:[<d1620af7>] EFLAGS: 00010286 CPU: 0 [15110038.570678] EIP is at hiddev_ioctl+0x26/0x56f [usbhid] [15110038.570733] EAX: 00000000 EBX: 400c4807 ECX: bf98ba14 EDX: fffffffb [15110038.570785] ESI: ce33dfc0 EDI: cc165000 EBP: bf98ba14 ESP: cb221ea0 [15110038.570845] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [15110038.570902] Process apcupsd (pid: 16828, ti=cb220000 task=ce3c3740 task.ti=cb220000) [15110038.570963] Stack: [15110038.571008] 00000000 c0700000 cfaa2000 c1808100 cfaa2000 c126d49e cf93ee80 c1046ed1 [15110038.571161] <0> c14148f4 c1419100 c1419100 c14146ac ce3c38fc c1808100 00000000 fef2d27a [15110038.571161] <0> 00000296 00000292 0000c350 ce3c3740 c1803924 cb221f44 c1046bed cb221f44 [15110038.571161] Call Trace: [15110038.571161] [<c126d49e>] ? schedule+0x78f/0x7dc [15110038.571161] [<c1046ed1>] ? __hrtimer_start_range_ns+0x24c/0x258 [15110038.571161] [<c1046bed>] ? lock_hrtimer_base+0x15/0x2f [15110038.571161] [<c1046c6b>] ? hrtimer_try_to_cancel+0x2f/0x35 [15110038.571161] [<c1046c7b>] ? hrtimer_cancel+0xa/0x14 [15110038.571161] [<d1620ad1>] ? hiddev_ioctl+0x0/0x56f [usbhid] [15110038.571161] [<c10bdad0>] ? vfs_ioctl+0x1c/0x5f [15110038.571161] [<c10be064>] ? do_vfs_ioctl+0x4aa/0x4e5 [15110038.571161] [<c10465a2>] ? hrtimer_wakeup+0x0/0x18 [15110038.571161] [<c104b286>] ? getnstimeofday+0x4d/0xc9 [15110038.571161] [<c104b33c>] ? do_gettimeofday+0xf/0x2b [15110038.571161] [<c10be0e0>] ? sys_ioctl+0x41/0x58 [15110038.571161] [<c10030fb>] ? sysenter_do_call+0x12/0x28 [15110038.571161] Code: 5b 5e 5f 5d c3 55 89 cd 57 56 53 89 d3 83 ec 7c 8b 40 70 ba fb ff ff ff 89 44 24 04 8b b0 10 c0 00 00 8b 7e 28 8b 87 54 0c 00 00 <8b> 08 8b 87 a0 0e 00 00 89 04 24 83 3e 00 0f 84 2b 05 00 00 81 [15110038.571161] EIP: [<d1620af7>] hiddev_ioctl+0x26/0x56f [usbhid] SS:ESP 0068:cb221ea0 [15110038.571161] CR2: 0000000000000000 [15110038.575540] ---[ end trace be99ea2a4634e858 ]--- [15110042.696117] usb 3-2: new low speed USB device using uhci_hcd and address 29 [15110042.888038] usb 3-2: New USB device found, idVendor=051d, idProduct=0002 [15110042.888145] usb 3-2: New USB device strings: Mfr=3, Product=1, SerialNumber=2 [15110042.888248] usb 3-2: Product: Back-UPS 500 FW: 6.4.I USB FW: c1 [15110042.888336] usb 3-2: Manufacturer: American Power Conversion [15110042.888391] usb 3-2: SerialNumber: BB0321000060 [15110042.893573] usb 3-2: configuration #1 chosen from 1 choice [15110043.412399] generic-usb 0003:051D:0002.0005: hiddev0,hidraw0: USB HID v1.00 Device [American Power Conversion Back-UPS 500 FW: 6.4.I USB FW: c1 ] on usb-0000:00:1d.1-2/input0 -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". 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