Comment 3 for bug 1252874

I've tried Andy's kernels from http://people.canonical.com/~apw/unstable-trusty/, but I can't tell whether this is fixed in 3.13 or not - bluetooth entirely fails to work in 3.13.

bluetoothd repeatedly spawns and crashes, with:
[ 31.268389] general protection fault: 0000 [#2] SMP
[ 31.268418] Modules linked in: rfcomm bnep binfmt_misc joydev x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm nls_iso8859_1 microcode arc4 psmouse serio_raw ath9k snd_hda_codec_via snd_seq_midi ath9k_common snd_seq_midi_event ath9k_hw snd_rawmidi ath snd_hda_codec_hdmi uvcvideo mac80211 videobuf2_vmalloc snd_hda_intel videobuf2_memops videobuf2_core snd_hda_codec snd_seq videodev snd_hwdep snd_seq_device ath3k cfg80211 snd_pcm lpc_ich btusb bluetooth rtsx_pci_ms snd_page_alloc memstick snd_timer snd mei_me mei soundcore mac_hid lp parport dm_crypt usb_storage rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 i915 lrw gf128mul glue_helper ablk_helper cryptd i2c_algo_bit e1000e drm_kms_helper ahci libahci drm rtsx_pci ptp pps_core wmi video
[ 31.269003] CPU: 0 PID: 1165 Comm: bluetoothd Tainted: G D 3.13.0-0-generic #1~unstable201311192152
[ 31.269075] Hardware name: System76, Inc. Galago UltraPro/Galago UltraPro, BIOS 4.6.5 07/09/2013
[ 31.269138] task: ffff880402ac6000 ti: ffff8804093e0000 task.ti: ffff8804093e0000
[ 31.269195] RIP: 0010:[<ffffffffa061004b>] [<ffffffffa061004b>] rfcomm_sock_getsockopt+0x10b/0x290 [rfcomm]
[ 31.269272] RSP: 0018:ffff8804093e1f00 EFLAGS: 00010246
[ 31.269309] RAX: 0000b8763f78eb76 RBX: 0000000000000012 RCX: 00007fff73fcef88
[ 31.269360] RDX: 0000000000000003 RSI: 0000000000000012 RDI: ffff880404493700
[ 31.269411] RBP: ffff8804093e1f38 R08: 00007fff73fcef8c R09: 00007fff73fcf208
[ 31.269462] R10: ffff88040f010430 R11: 0000000000000202 R12: ffff88040932ec00
[ 31.269514] R13: 00007fff73fcef88 R14: 0000000000000003 R15: ffff880404493700
[ 31.269565] FS: 00007f86afcb5740(0000) GS:ffff88041fa00000(0000) knlGS:0000000000000000
[ 31.269622] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 31.269662] CR2: 00007f86aef2bec0 CR3: 0000000406aa9000 CR4: 00000000001407f0
[ 31.269707] Stack:
[ 31.269720] 0000000000000246 ffff8804093e1f58 ffff880404493700 0000000000000012
[ 31.269775] 0000000000000003 00007fff73fcef88 00007fff73fcef8c ffff8804093e1f78
[ 31.269833] ffffffff81614448 0000000000000000 0000000000000001 00007fff73fcf208
[ 31.269896] Call Trace:
[ 31.269923] [<ffffffff81614448>] SyS_getsockopt+0x68/0xd0
[ 31.269973] [<ffffffff817355ff>] tracesys+0xe1/0xe6
[ 31.270010] Code: f1 48 83 c4 10 44 89 c8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 4d 8b 67 20 f6 05 47 6f 00 00 04 49 8b 84 24 e8 02 00 00 <48> 8b 18 0f 85 48 01 00 00 4c 89 c0 e8 f4 52 d7 e0 85 c0 49 89
[ 31.270233] RIP [<ffffffffa061004b>] rfcomm_sock_getsockopt+0x10b/0x290 [rfcomm]
[ 31.270294] RSP <ffff8804093e1f00>
[ 31.270322] ---[ end trace cd2dc7599da16d4a ]---