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["Christopher M. Penalver" <christopher.penalver@xxxxxxx>]

*** This bug is a duplicate of bug 1015836 ***
    https://bugs.launchpad.net/bugs/1015836

** Summary changed:

- lircd-0.9.0 reports USB disconnect followed by kernel Oops
+ BUG: unable to handle kernel NULL pointer dereference at 0000000000000050;  RIP: 0010:[<ffffffffa015a6f7>] [<ffffffffa015a6f7>] show_protocols+0x107/0x150 [rc_core]

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https://bugs.launchpad.net/bugs/953567

Title:
  BUG: unable to handle kernel NULL pointer dereference at
  0000000000000050;  RIP: 0010:[<ffffffffa015a6f7>] [<ffffffffa015a6f7>]
  show_protocols+0x107/0x150 [rc_core]

Status in “lirc” package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I had the following kernel Oops today, apparently related to lirc. I
  found some other bug reports stating that suspending the system can
  causes problems. However, the system was on the whole time, the remote
  was not in use and it was not manually unplugged.

  Ubuntu 11.10
  lirc  0.9.0-0ubuntu1 
  kernel: linux-image-3.0.0-16-server        3.0.0-16.29

  Model of USB infrared receiver:

  I: Bus=0003 Vendor=1934 Product=5168 Version=0001
  N: Name="Media Center Ed. eHome Infrared Remote Transceiver (1934:5168)"
  P: Phys=usb-0000:00:1a.0-1.5
  S: Sysfs=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0/rc/rc0/input3
  U: Uniq=
  H: Handlers=kbd event3
  B: PROP=0
  B: EV=100013
  B: KEY=fff 0 200108fc32e 237605100000000 0 700158000 419200000001 9e968000000000 10000000
  B: MSC=10

  syslog:

  Mar 12 18:55:00 mdVMHost01 lircd-0.9.0[862]: error reading from /dev/lirc0 (ret -1, expected 4)
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.384282] usb 1-1.5: USB disconnect, device number 4
  Mar 12 18:55:00 mdVMHost01 lircd-0.9.0[862]: No such device
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.401242] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.402147] IP: [<ffffffffa015a6f7>] show_protocols+0x107/0x150 [rc_core]
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.403058] PGD 39af08067 PUD 3872ea067 PMD 0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.403973] Oops: 0000 [#1] SMP
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.404887] CPU 0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.404900] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs reiserfs udf crc_itu_t ip6table_filter ip6_tables ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables tda18271 s5h1411 kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_realtek bridge stp ir_lirc_codec lirc_dev ir_sony_decoder saa7164 ir_jvc_decoder ir_rc6_decoder rc_rc6_mce ir_rc5_decoder mxm_wmi dvb_core ir_nec_decoder v4l2_common videodev i915 mceusb snd_hda_intel v4l2_compat_ioctl32 rc_core snd_hda_codec tveeprom drm_kms_helper snd_hwdep drm snd_pcm snd_timer wmi snd soundcore i2c_algo_bit mei(C) snd_page_alloc video lp parport raid456 async_pq async_xor xor async_memcpy async_raid6_recov usb_storage uas raid10 usbhid hid raid6_pq async_tx raid1 raid0 xhci_hcd e1000e r8169 multipath linear
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.413870]
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.415095] Pid: 4755, comm: cat Tainted: G         C  3.0.0-16-server #28-Ubuntu Gigabyte Technology Co., Ltd. Z68A-D3H-B3/Z
  68A-D3H-B3
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.417718] RIP: 0010:[<ffffffffa015a6f7>]  [<ffffffffa015a6f7>] show_protocols+0x107/0x150 [rc_core]
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.419110] RSP: 0018:ffff880026e11e08  EFLAGS: 00010202
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.420502] RAX: 0000000000000000 RBX: ffff8803e4d33000 RCX: 0000000000000001
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.421915] RDX: ffff8801eef28000 RSI: ffffffffa015e180 RDI: ffff8803e4d332c0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.423341] RBP: ffff880026e11e48 R08: 0000000000000000 R09: 0000000000004fb8
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.424789] R10: 0000000000000002 R11: 0000000000000246 R12: ffff8801eef28000
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.426246] R13: ffff8803e4d332c0 R14: ffff8803e4d33010 R15: ffff8803dc218b40
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.427731] FS:  00007fec41411720(0000) GS:ffff8803ffc00000(0000) knlGS:0000000000000000
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.429248] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.430765] CR2: 0000000000000050 CR3: 00000003da8ec000 CR4: 00000000000426e0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.432306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.433848] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.435378] Process cat (pid: 4755, threadinfo ffff880026e10000, task ffff8803b2240000)
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.436925] Stack:
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.438449]  0000000000000000 ffffffff81c36240 0000000000000000 ffffffffa015e180
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.440025]  ffff8803e84b9cd0 ffffffff81851060 ffff8803e4d33010 ffff8803dc218b40
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.441616]  ffff880026e11e78 ffffffff813cd2b0 ffff880026e11e68 ffffffff8110e3de
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.443220] Call Trace:
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.444810]  [<ffffffff813cd2b0>] dev_attr_show+0x20/0x60
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.446410]  [<ffffffff8110e3de>] ? __get_free_pages+0xe/0x50
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.448013]  [<ffffffff811d7b06>] fill_read_buffer.isra.7+0x66/0xf0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.449609]  [<ffffffff811d7c34>] sysfs_read_file+0xa4/0xc0
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.451180]  [<ffffffff811683d0>] vfs_read+0xb0/0x180
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.452718]  [<ffffffff811684ea>] sys_read+0x4a/0x90
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.454237]  [<ffffffff8160f482>] system_call_fastpath+0x16/0x1b
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.455761] 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 d4 15 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
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.459140] RIP  [<ffffffffa015a6f7>] show_protocols+0x107/0x150 [rc_core]
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.460796]  RSP <ffff880026e11e08>
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.462425] CR2: 0000000000000050
  Mar 12 18:55:00 mdVMHost01 kernel: [1728244.946791] ---[ end trace 6fbfb6cd1b58474f ]---
  Mar 12 18:55:00 mdVMHost01 lircd-0.9.0[862]: caught signal

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