I cam to launchpad to report a kernel crash with hfsplus also.

I was playing music in Rhythmbox from a file on an external USB HFS+ partition, and suddenly my X session vanished and I was looking at a console window with some debug/error text messages.
A few seconds later, my computer spontaneously rebooted.

I don't know if my issue is related, but here is a relevant excerpt from /var/log/syslog:

Jun 17 10:44:39 desktop kernel: [494052.191327] general protection fault: 0000 [#1] SMP 
Jun 17 10:44:39 desktop kernel: [494052.194041] last sysfs file: /sys/devices/system/cpu/cpu3/cpufreq/scaling_min_freq
Jun 17 10:44:39 desktop kernel: [494052.196789] CPU 1 
Jun 17 10:44:39 desktop kernel: [494052.196801] Modules linked in: nls_utf8 hfsplus binfmt_misc rfcomm parport_pc ppdev dm_crypt bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec btusb bluetooth snd_usb_audio snd_pcm snd_hwdep snd_usbmidi_lib snd_seq_midi snd_seq_midi_event snd_seq max6650 snd_rawmidi snd_timer uvcvideo arc4 coretemp videodev v4l2_compat_ioctl32 usblp snd_seq_device ath9k mac80211 ath9k_common ath9k_hw psmouse snd ath3k ath cfg80211 xhci_hcd joydev serio_raw soundcore snd_page_alloc lp parport usb_storage usbhid hid lzo vesafb i915 drm_kms_helper drm r8169 ahci libahci i2c_algo_bit video
Jun 17 10:44:39 desktop kernel: [494052.208238] 
Jun 17 10:44:39 desktop kernel: [494052.211134] Pid: 23438, comm: rhythmbox Not tainted 2.6.39-0-generic #5~20110427-Ubuntu System manufacturer System Product Name/P8H67-I DELUXE
Jun 17 10:44:39 desktop kernel: [494052.214107] RIP: 0010:[<ffffffff812f4460>]  [<ffffffff812f4460>] memcpy+0x10/0x120
Jun 17 10:44:39 desktop kernel: [494052.217085] RSP: 0018:ffff8802093e19c0  EFLAGS: 00010202
Jun 17 10:44:39 desktop kernel: [494052.220042] RAX: ffff8802093e1a46 RBX: ffff8802093e1a46 RCX: 0000000000000002
Jun 17 10:44:39 desktop kernel: [494052.223002] RDX: 0000000000000002 RSI: db73880000000e75 RDI: ffff8802093e1a46
Jun 17 10:44:39 desktop kernel: [494052.225979] RBP: ffff8802093e1a28 R08: 0000000000000010 R09: 6db6db6db6db6db7
Jun 17 10:44:39 desktop kernel: [494052.228950] R10: ffff880000000000 R11: 0000000000000246 R12: 0000000000000002
Jun 17 10:44:39 desktop kernel: [494052.231891] R13: 0000000000000002 R14: 0000000000000002 R15: ffff88022e78bcc0
Jun 17 10:44:39 desktop kernel: [494052.234823] FS:  00007f9df953a700(0000) GS:ffff88023fa80000(0000) knlGS:0000000000000000
Jun 17 10:44:39 desktop kernel: [494052.237775] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jun 17 10:44:39 desktop kernel: [494052.240713] CR2: 00007f448bbb5000 CR3: 000000013c72f000 CR4: 00000000000406e0
Jun 17 10:44:39 desktop kernel: [494052.243636] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jun 17 10:44:39 desktop kernel: [494052.246536] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jun 17 10:44:39 desktop kernel: [494052.249431] Process rhythmbox (pid: 23438, threadinfo ffff8802093e0000, task ffff8801041716d0)
Jun 17 10:44:39 desktop kernel: [494052.252349] Stack:
Jun 17 10:44:39 desktop kernel: [494052.255238]  ffffffffa0499731 ffff8802093e1a38 ffff880000000000 6db6db6db6db6db7
Jun 17 10:44:39 desktop kernel: [494052.258142]  0000160000000000 0000000000000010 0000000000000000 000000000000000b
Jun 17 10:44:39 desktop kernel: [494052.261021]  ffff88022e78bcc0 ffff88022e78bcc0 ffff8802093e1b48 0000000000000010
Jun 17 10:44:39 desktop kernel: [494052.263885] Call Trace:
Jun 17 10:44:39 desktop kernel: [494052.266729]  [<ffffffffa0499731>] ? hfsplus_bnode_read+0xb1/0x140 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.269608]  [<ffffffffa04997dd>] hfsplus_bnode_read_u16+0x1d/0x30 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.272493]  [<ffffffffa049b55a>] hfsplus_brec_keylen+0x6a/0x90 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.275375]  [<ffffffffa049be4b>] __hplusfs_brec_find+0x6b/0x170 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.278256]  [<ffffffffa049c026>] hfsplus_brec_find+0xd6/0x140 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.281057]  [<ffffffff815df6de>] ? mutex_lock+0x1e/0x50
Jun 17 10:44:39 desktop kernel: [494052.283778]  [<ffffffff8117e0c0>] ? filldir64+0xf0/0xf0
Jun 17 10:44:39 desktop kernel: [494052.286486]  [<ffffffffa0497d6c>] hfsplus_readdir+0xcc/0x470 [hfsplus]
Jun 17 10:44:39 desktop kernel: [494052.289201]  [<ffffffff81106ee1>] ? __perf_event_task_sched_out+0x31/0x60
Jun 17 10:44:39 desktop kernel: [494052.291891]  [<ffffffff8104fc7e>] ? perf_event_task_sched_out+0x2e/0xa0
Jun 17 10:44:39 desktop kernel: [494052.294572]  [<ffffffff8100a777>] ? __switch_to+0x157/0x2f0
Jun 17 10:44:39 desktop kernel: [494052.297243]  [<ffffffff815e0fbe>] ? _raw_spin_lock+0xe/0x20
Jun 17 10:44:39 desktop kernel: [494052.299911]  [<ffffffff81054b81>] ? finish_task_switch+0x41/0xe0
Jun 17 10:44:39 desktop kernel: [494052.302566]  [<ffffffff81037f39>] ? default_spin_lock_flags+0x9/0x10
Jun 17 10:44:39 desktop kernel: [494052.305188]  [<ffffffff812effe5>] ? timerqueue_del+0x35/0x90
Jun 17 10:44:39 desktop kernel: [494052.307807]  [<ffffffff8108aabb>] ? __remove_hrtimer+0x3b/0x80
Jun 17 10:44:39 desktop kernel: [494052.310406]  [<ffffffff8108ae6c>] ? hrtimer_try_to_cancel+0x4c/0xe0
Jun 17 10:44:39 desktop kernel: [494052.312960]  [<ffffffff8108af22>] ? hrtimer_cancel+0x22/0x30
Jun 17 10:44:39 desktop kernel: [494052.315477]  [<ffffffff8109a904>] ? futex_wait+0x1d4/0x2d0
Jun 17 10:44:39 desktop kernel: [494052.317981]  [<ffffffff8109a57a>] ? get_futex_key+0x15a/0x210
Jun 17 10:44:39 desktop kernel: [494052.320460]  [<ffffffff8117e0c0>] ? filldir64+0xf0/0xf0
Jun 17 10:44:39 desktop kernel: [494052.322928]  [<ffffffff8117dfa8>] vfs_readdir+0xb8/0xe0
Jun 17 10:44:39 desktop kernel: [494052.325355]  [<ffffffff8109d04b>] ? sys_futex+0x7b/0x180
Jun 17 10:44:39 desktop kernel: [494052.327742]  [<ffffffff8117e299>] sys_getdents+0x89/0xf0
Jun 17 10:44:39 desktop kernel: [494052.330111]  [<ffffffff815e93c2>] system_call_fastpath+0x16/0x1b
Jun 17 10:44:39 desktop kernel: [494052.332456] Code: 43 4e 48 83 c4 08 5b c9 c3 66 90 e8 0b fd ff ff eb e6 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 <f3> a4 c3 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 
Jun 17 10:44:39 desktop kernel: [494052.335002] RIP  [<ffffffff812f4460>] memcpy+0x10/0x120


Dear Experts: I can provide more details or open a separate bug. Please advise.