[ 17.357840] BUG: unable to handle kernel NULL pointer dereference at 0000000000000198 [ 17.357891] IP: [] swiotlb_map_sg_attrs+0x50/0x130 [ 17.357934] PGD 13cbd1067 PUD 13d10f067 PMD 0 [ 17.357970] Oops: 0000 [#1] PREEMPT SMP [ 17.358003] last sysfs file: /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:39/PNP0C09:00/PNP0C0A:00/power_supply/BAT1/power_now [ 17.358074] CPU 1 [ 17.358088] Modules linked in: snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ipv6 usbhid coretemp autofs4 binfmt_misc ext2 r5u870 usbcam videodev v4l1_compat v4l2_compat_ioctl32 videobuf_dma_sg videobuf_core loop cpufreq_conservative cpufreq_powersave acpi_cpufreq mperf tun hwmon pcmcia arc4 ecb snd_hda_codec_idt iwlagn iwlcore snd_hda_intel snd_hda_codec mac80211 snd_pcm firewire_ohci snd_timer cfg80211 tifm_7xx1 firewire_core psmouse ehci_hcd uhci_hcd sky2 yenta_socket snd pcmcia_rsrc tifm_core pcmcia_core sony_laptop evdev sg rfkill crc_itu_t i2c_i801 usbcore thermal soundcore snd_page_alloc processor [ 17.358279] [ 17.358279] Pid: 6495, comm: mplayer Not tainted 2.6.37-gentoo-r4 #5 Sony Corporation VGN-SZ730E/VAIO [ 17.358279] RIP: 0010:[] [] swiotlb_map_sg_attrs+0x50/0x130 [ 17.358279] RSP: 0018:ffff88013dd11b48 EFLAGS: 00010246 [ 17.358279] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 [ 17.358279] RDX: 0000000000000096 RSI: 00000000ba80c000 RDI: 0000000000000000 [ 17.358279] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000002 [ 17.358279] R10: 0000000000001000 R11: 0000000000001000 R12: 0000000000000096 [ 17.358279] R13: ffffc9002089d000 R14: 0000160000000000 R15: 6db6db6db6db6db7 [ 17.358279] FS: 00007fab5537a780(0000) GS:ffff8800bf500000(0000) knlGS:0000000000000000 [ 17.358279] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 17.358279] CR2: 0000000000000198 CR3: 000000013d3bf000 CR4: 00000000000006e0 [ 17.358279] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.358279] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 17.358279] Process mplayer (pid: 6495, threadinfo ffff88013dd10000, task ffff88013f4b5af0) [ 17.358279] Stack: [ 17.358279] 0000000000000000 00000002810b0d05 ffffc9002089d000 0000000000000000 [ 17.358279] 00000000000000d2 ffff88013d1bb4e0 0000000000000000 ffffffff814ddca0 [ 17.358279] ffffc9002089d000 0000000000000096 0000000000000002 ffffffffa014a795 [ 17.358279] Call Trace: [ 17.358279] [] ? videobuf_dma_map+0x195/0x3f0 [videobuf_dma_sg] [ 17.358279] [] ? usbcam_capture_stop+0x218/0x2d0 [usbcam] [ 17.358279] [] ? videobuf_qbuf+0x224/0x5a0 [videobuf_core] [ 17.358279] [] ? usbcam_register_mod+0x15fb/0x2350 [usbcam] [ 17.358279] [] ? __alloc_pages_nodemask+0x100/0x7e0 [ 17.358279] [] ? __video_do_ioctl+0x21ae/0x3f50 [videodev] [ 17.358279] [] ? filemap_fault+0x98/0x460 [ 17.358279] [] ? usbcam_register_mod+0x15e0/0x2350 [usbcam] [ 17.358279] [] ? __do_fault+0x3c2/0x490 [ 17.358279] [] ? video_ioctl2+0x11f/0x560 [videodev] [ 17.358279] [] ? vma_link+0xa8/0xf0 [ 17.358279] [] ? v4l2_ioctl+0x154/0x180 [videodev] [ 17.358279] [] ? do_vfs_ioctl+0x9f/0x550 [ 17.358279] [] ? sys_ioctl+0x49/0x80 [ 17.358279] [] ? system_call_fastpath+0x16/0x1b [ 17.358279] Code: 0f 84 00 01 00 00 31 db 49 89 f5 49 be 00 00 00 00 00 16 00 00 49 bf b7 6d db b6 6d db b6 6d 85 d2 7f 44 e9 cc 00 00 00 0f 1f 00 <48> 8b 85 98 01 00 00 41 8b 55 0c 48 85 c0 74 58 48 8d 4c 32 ff [ 17.358279] RIP [] swiotlb_map_sg_attrs+0x50/0x130 [ 17.358279] RSP [ 17.358279] CR2: 0000000000000198 [ 17.368039] ---[ end trace 11d2bc6b2fbf8ed1 ]---