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[ 4887.844216] usb 1-1: new high-speed USB device number 5 using ehci_hcd
[ 4888.720002] scsi7 : usb-storage 1-1:1.0
[ 4888.758897] input: Rockbox.org Rockbox media player as /devices/pci0000:00/0000:00:04.1/usb1/1-1/1-1:1.1/input/input11
[ 4888.759310] generic-usb 0003:0781:7433.0006: input,hidraw1: USB HID v1.10 Keyboard [Rockbox.org Rockbox media player] on usb-0000:00:04.1-1/input1
[ 4889.757774] scsi 7:0:0:0: Direct-Access     Rockbox  Internal Storage 0.00 PQ: 0 ANSI: 4
[ 4889.759688] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 4889.762999] sd 7:0:0:0: [sdb] 3992576 512-byte logical blocks: (2.04 GB/1.90 GiB)
[ 4889.763673] sd 7:0:0:0: [sdb] Write Protect is off
[ 4889.763683] sd 7:0:0:0: [sdb] Mode Sense: 0b 00 00 08
[ 4889.764742] sd 7:0:0:0: [sdb] No Caching mode page present
[ 4889.764752] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 4889.768618] sd 7:0:0:0: [sdb] No Caching mode page present
[ 4889.768623] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 4889.770622]  sdb: sdb1
[ 4889.773608] sd 7:0:0:0: [sdb] No Caching mode page present
[ 4889.773613] sd 7:0:0:0: [sdb] Assuming drive cache: write through
[ 4889.773617] sd 7:0:0:0: [sdb] Attached SCSI removable disk
[ 4893.188779] usb 1-1: USB disconnect, device number 5
[ 4893.219745] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 4893.219751] IP: [<ffffffff8143fda0>] sd_revalidate_disk+0x30/0x2a0
[ 4893.219760] PGD 6900c067 PUD 6778f067 PMD 0 
[ 4893.219764] Oops: 0000 [#1] SMP 
[ 4893.219767] CPU 0 
[ 4893.219769] Modules linked in: usb_storage uas rfcomm bnep kvm_intel kvm parport_pc ppdev binfmt_misc nls_iso8859_1 nls_cp437 dm_crypt vfat fat snd_hda_codec_cirrus snd_hda_intel snd_hda_codec snd_hwdep snd_pcm nvidia(P) snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd bcma arc4 soundcore uvcvideo videodev brcmsmac mac80211 brcmutil cfg80211 crc8 joydev i2c_nforce2 btusb cordic bluetooth applesmc bcm5974 shpchp snd_page_alloc apple_bl v4l2_compat_ioctl32 lp input_polldev parport hid_apple usbhid hid forcedeth
[ 4893.219807] 
[ 4893.219809] Pid: 25978, comm: udisks-part-id Tainted: P           O 3.2.0-7-generic #13-Ubuntu Apple Inc. MacBook6,1/Mac-F22C8AC8
[ 4893.219814] RIP: 0010:[<ffffffff8143fda0>]  [<ffffffff8143fda0>] sd_revalidate_disk+0x30/0x2a0
[ 4893.219818] RSP: 0018:ffff880003215b08  EFLAGS: 00010246
[ 4893.219821] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8800691d05c0
[ 4893.219823] RDX: 0000000000000005 RSI: 0000000000000002 RDI: ffff88006db08400
[ 4893.219825] RBP: ffff880003215b28 R08: 0000000800000000 R09: 00000008ffffffff
[ 4893.219827] R10: 0000000000000000 R11: ffffc90000682000 R12: ffff88006db08400
[ 4893.219829] R13: 00000000ffffff85 R14: ffff88006850fa98 R15: ffff88006db08400
[ 4893.219832] FS:  00007f5bfeeb1820(0000) GS:ffff88006d200000(0000) knlGS:0000000000000000
[ 4893.219834] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 4893.219836] CR2: 0000000000000008 CR3: 000000005346a000 CR4: 00000000000406f0
[ 4893.219839] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4893.219841] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 4893.219843] Process udisks-part-id (pid: 25978, threadinfo ffff880003214000, task ffff8800510cae20)
[ 4893.219845] Stack:
[ 4893.219847]  ffff88006850fa80 ffff88006db08400 00000000ffffff85 ffff88006850fa98
[ 4893.219851]  ffff880003215ba8 ffffffff811e295a ffff88006db0840c ffff88006db08478
[ 4893.219855]  0000000003215b68 ffff88006850fa80 ffff88006db09800 ffff88006db08400
[ 4893.219859] Call Trace:
[ 4893.219865]  [<ffffffff811e295a>] rescan_partitions+0xaa/0x300
[ 4893.219869]  [<ffffffff811ae93c>] __blkdev_get+0x2bc/0x420
[ 4893.219872]  [<ffffffff811aeafe>] blkdev_get+0x5e/0x1e0
[ 4893.219874]  [<ffffffff811aecdd>] blkdev_open+0x5d/0x80
[ 4893.219879]  [<ffffffff81173ef0>] __dentry_open+0x290/0x360
[ 4893.219882]  [<ffffffff811aec80>] ? blkdev_get+0x1e0/0x1e0
[ 4893.219886]  [<ffffffff8129a1ec>] ? security_inode_permission+0x1c/0x30
[ 4893.219890]  [<ffffffff811755ed>] nameidata_to_filp+0xad/0xb0
[ 4893.219894]  [<ffffffff811844b8>] do_last+0x3f8/0x730
[ 4893.219897]  [<ffffffff81185b91>] path_openat+0xd1/0x3f0
[ 4893.219899]  [<ffffffff81185fd2>] do_filp_open+0x42/0xa0
[ 4893.219903]  [<ffffffff81314a71>] ? strncpy_from_user+0x31/0x40
[ 4893.219907]  [<ffffffff8118132a>] ? do_getname+0x10a/0x180
[ 4893.219911]  [<ffffffff8165207e>] ? _raw_spin_lock+0xe/0x20
[ 4893.219914]  [<ffffffff81193257>] ? alloc_fd+0xf7/0x150
[ 4893.219917]  [<ffffffff811756dd>] do_sys_open+0xed/0x220
[ 4893.219920]  [<ffffffff81175830>] sys_open+0x20/0x30
[ 4893.219924]  [<ffffffff8165a5c2>] system_call_fastpath+0x16/0x1b
[ 4893.219926] Code: 83 ec 20 48 89 5d e0 4c 89 65 e8 4c 89 6d f0 4c 89 75 f8 66 66 66 66 90 8b 05 4d 87 ad 00 48 8b 9f 38 03 00 00 49 89 fc c1 e8 15 <4c> 8b 6b 08 83 e0 07 83 f8 03 0f 87 0d 02 00 00 41 8b 85 70 06 
[ 4893.219960] RIP  [<ffffffff8143fda0>] sd_revalidate_disk+0x30/0x2a0
[ 4893.219964]  RSP <ffff880003215b08>
[ 4893.219965] CR2: 0000000000000008
[ 4893.219968] ---[ end trace 748fba2651cb4772 ]---
[ 4905.328215] usb 1-1: new high-speed USB device number 6 using ehci_hcd
[ 4905.627511] scsi8 : usb-storage 1-1:1.0
[ 4905.665973] input: Rockbox.org Rockbox media player as /devices/pci0000:00/0000:00:04.1/usb1/1-1/1-1:1.1/input/input12
[ 4905.666389] generic-usb 0003:0781:7433.0007: input,hidraw1: USB HID v1.10 Keyboard [Rockbox.org Rockbox media player] on usb-0000:00:04.1-1/input1
[ 4906.654984] scsi 8:0:0:0: Direct-Access     Rockbox  Internal Storage 0.00 PQ: 0 ANSI: 4
[ 4906.657074] sd 8:0:0:0: Attached scsi generic sg2 type 0
[ 4906.659538] sd 8:0:0:0: [sdb] 3992576 512-byte logical blocks: (2.04 GB/1.90 GiB)
[ 4906.661044] sd 8:0:0:0: [sdb] Write Protect is off
[ 4906.661054] sd 8:0:0:0: [sdb] Mode Sense: 0b 00 00 08
[ 4906.662030] sd 8:0:0:0: [sdb] No Caching mode page present
[ 4906.662039] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[ 4915.395675] usb 1-1: USB disconnect, device number 6
[ 5798.032483] ACPI: EC: GPE storm detected, transactions will use polling mode
[ 6455.810283] ieee80211 phy0: brcms_c_dotxstatus: INTERMEDIATE but not AMPDU