I believe the root cause of this kernel oops is for the exact same reason as what happens when you manually unplug the mceusb device... I'm able to reproduce nearly the exact same code output from manually unplugging the device as what you have hapen when you suspend the computer. Either way, it should not matter whether or not you manually unplug the mceusb device, or have the system suspend or resume. Neither of these actions should cause a kernel Oops.
Also, just for a reference, Here's a sample oops log for when you manually unplug the mceusb device. ================================================================== [10277.604190] usb 2-3.2: USB disconnect, device number 6 [10277.615669] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [10277.615684] IP: [<ffffffffa04ec6f7>] show_protocols+0x107/0x150 [rc_core] [10277.615703] PGD 9aa40067 PUD 9aa41067 PMD 0 [10277.615714] Oops: 0000 [#1] SMP [10277.615721] CPU 1 [10277.615725] Modules linked in: rc_rc6_mce mceusb hidp bnep rfcomm speedstep_lib parport_pc ppdev binfmt_misc vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel ir_lirc_codec lirc_dev mt2131 ir_sony_decoder snd_hda_codec ir_jvc_decoder ir_rc6_decoder s5h1409 snd_hwdep ir_rc5_decoder snd_pcm ir_nec_decoder snd_seq_midi cx23885 rc_core altera_stapl(C) cx2341x videobuf_dma_sg videobuf_dvb videobuf_core v4l2_common videodev snd_rawmidi snd_seq_midi_event joydev usbhid hid snd_seq fglrx(P) snd_timer snd_seq_device v4l2_compat_ioctl32 altera_ci btusb dvb_core snd edac_core edac_mce_amd bluetooth btcx_risc k10temp soundcore sp5100_tco i2c_piix4 serio_raw snd_page_alloc tveeprom wmi lp parport usb_storage firewire_ohci uas r8169 firewire_core crc_itu_t pata_atiixp ahci libahci [10277.615833] [10277.615840] Pid: 3993, comm: cat Tainted: P C 3.0.0-17-generic #30-Ubuntu Gigabyte Technology Co., Ltd. GA-MA790XT-UD4P/GA-MA790XT-UD4P [10277.615852] RIP: 0010:[<ffffffffa04ec6f7>] [<ffffffffa04ec6f7>] show_protocols+0x107/0x150 [rc_core] [10277.615867] RSP: 0018:ffff8800408c5e08 EFLAGS: 00010202 [10277.615872] RAX: 0000000000000000 RBX: ffff8801288fe800 RCX: 0000000000000001 [10277.615878] RDX: ffff8800408c5fd8 RSI: ffffffffa04f0180 RDI: ffff8801288feac0 [10277.615883] RBP: ffff8800408c5e48 R08: 0000000000000000 R09: 00000000000061cc [10277.615889] R10: 0000000000000002 R11: 0000000000000246 R12: ffff88009aa48000 [10277.615894] R13: ffff8801288feac0 R14: ffff8801288fe810 R15: ffff8800af1c76c0 [10277.615902] FS: 00007fbb5eea7720(0000) GS:ffff88012fc40000(0000) knlGS:0000000000000000 [10277.615908] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [10277.615913] CR2: 0000000000000050 CR3: 000000009aa43000 CR4: 00000000000006e0 [10277.615918] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [10277.615924] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [10277.615930] Process cat (pid: 3993, threadinfo ffff8800408c4000, task ffff88011ce0dc80) [10277.615935] Stack: [10277.615938] 0000000000000000 ffffffff81c36240 0000000000000000 ffffffffa04f0180 [10277.615947] ffff880041e48050 ffffffff81851080 ffff8801288fe810 ffff8800af1c76c0 [10277.615957] ffff8800408c5e78 ffffffff813cd930 ffff8800408c5e68 ffffffff8110f02e [10277.615966] Call Trace: [10277.615978] [<ffffffff813cd930>] dev_attr_show+0x20/0x60 [10277.615988] [<ffffffff8110f02e>] ? __get_free_pages+0xe/0x50 [10277.616003] [<ffffffff811d8c16>] fill_read_buffer.isra.7+0x66/0xf0 [10277.616012] [<ffffffff811d8d44>] sysfs_read_file+0xa4/0xc0 [10277.616022] [<ffffffff811688b0>] vfs_read+0xb0/0x180 [10277.616030] [<ffffffff811689ca>] sys_read+0x4a/0x90 [10277.616039] [<ffffffff815fb342>] system_call_fastpath+0x16/0x1b [10277.616044] Code: 5b 41 5c 41 5d 41 5e 41 5f 5d c3 66 0f 1f 84 00 00 00 00 00 49 8b 57 08 48 c7 c6 16 f4 4e a0 eb a1 0f 1f 00 48 8b 83 e8 02 00 00 <4c> 8b 70 50 e8 a0 1a 00 00 48 89 c3 e9 38 ff ff ff 48 c7 c0 ea [10277.616109] RIP [<ffffffffa04ec6f7>] show_protocols+0x107/0x150 [rc_core] [10277.616120] RSP <ffff8800408c5e08> [10277.616124] CR2: 0000000000000050 [10277.616165] ---[ end trace 902226f6c5c3bc4b ]--- [10360.430763] usbcore: deregistering interface driver mceusb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/953567 Title: lircd-0.9.0 reports USB disconnect followed by kernel Oops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lirc/+bug/953567/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
