Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at 0000000000000050; RIP: 0010:[<ffffffffa01988cf>] [<ffffffffa01988cf>] show_protocols+0x11f/0x130 [rc_core]

[Alvaro Leal (Effenberg0x0)]

Streamzap USBIR2 remote control used to work fine on Ubuntu with devinput. With the latest updates to Oneiric (Oct. 12, 2011), it crashes when unplugged from usb, with the error messages below. At this point, it is impossible to make it work again until you reboot the PC.

To reproduce: Simply unplug the device and look at dmesg.

[ 695.140778] usb 5-1: USB disconnect, device number 2
[ 695.141526] streamzap 5-1:1.0: urb terminated, status: -108
[ 695.155873] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
[ 695.155887] IP: [<ffffffffa01988cf>] show_protocols+0x11f/0x130 [rc_core]
[ 695.155907] PGD 3fe1d6067 PUD 3fe3cc067 PMD 0
[ 695.155917] Oops: 0000 [#1] SMP
[ 695.155925] CPU 3
[ 695.155928] Modules linked in: bnep rfcomm bluetooth speedstep_lib parport_pc ppdev ip6t_LOG xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_addrtype xt_state ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast binfmt_misc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp nf_conntrack snd_hda_codec_realtek iptable_filter nvidia(P) ip_tables x_tables snd_hda_intel snd_hda_codec snd_hwdep ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder snd_pcm ir_rc5_sz_decoder ir_rc5_decoder snd_seq_midi rc_streamzap ir_nec_decoder snd_rawmidi snd_seq_midi_event streamzap rc_core snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc sp5100_tco i2c_piix4 wmi edac_core k10temp edac_mce_amd asus_atk0110 lp parport raid10 raid456 async_raid6_recov async_pq firewire_ohci usbhid firewire_core raid6_pq async_xor hid crc_itu_t sata_sil r8169 ahci xhci_hcd pata_jmicron libahci xor async_memcpy async_tx raid1 raid0 multipath linear
[ 695.156075]
[ 695.156082] Pid: 29539, comm: cat Tainted: P 3.0.0-0300-generic #201107220917 System manufacturer System Product Name/M4A89GTD-PRO/USB3
[ 695.156095] RIP: 0010:[<ffffffffa01988cf>] [<ffffffffa01988cf>] show_protocols+0x11f/0x130 [rc_core]
[ 695.156111] RSP: 0018:ffff8803fdfdde48 EFLAGS: 00010202
[ 695.156117] RAX: 0000000000000000 RBX: ffff880425109800 RCX: 0000000000000001
[ 695.156123] RDX: ffff8803fdfddfd8 RSI: ffffffffa019c160 RDI: ffff880425109ac0
[ 695.156129] RBP: ffff8803fdfdde78 R08: 0000000000015d4f R09: ffffea000dfe1f68
[ 695.156135] R10: 0000000000000000 R11: 0000000000000246 R12: fffffffffffffffb
[ 695.156140] R13: ffff880425109810 R14: ffffffff8164cb00 R15: ffff8803ff76b000
[ 695.156148] FS: 00007ffed02ee720(0000) GS:ffff88043fcc0000(0000) knlGS:0000000000000000
[ 695.156154] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 695.156159] CR2: 0000000000000050 CR3: 00000003fe35a000 CR4: 00000000000006e0
[ 695.156165] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 695.156171] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 695.156178] Process cat (pid: 29539, threadinfo ffff8803fdfdc000, task ffff8803fe0fc4d0)
[ 695.156183] Stack:
[ 695.156186] ffff880425109ac0 ffffffffa019c160 fffffffffffffffb ffff880425109810
[ 695.156196] ffffffff8164cb00 0000000000008000 ffff8803fdfdde98 ffffffff813c8e1f
[ 695.156206] ffff88041f884720 ffff88041e8496e0 ffff8803fdfddec8 ffffffff811dae57
[ 695.156216] Call Trace:
[ 695.156230] [<ffffffff813c8e1f>] dev_attr_show+0x2f/0x60
[ 695.156241] [<ffffffff811dae57>] fill_read_buffer+0x67/0xe0
[ 695.156250] [<ffffffff811daf65>] sysfs_read_file+0x95/0xa0
[ 695.156260] [<ffffffff8116b669>] vfs_read+0xc9/0x180
[ 695.156269] [<ffffffff8116bbd5>] sys_read+0x55/0x90
[ 695.156278] [<ffffffff815e8382>] system_call_fastpath+0x16/0x1b
[ 695.156283] Code: 01 4c 29 f8 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f c9 c3 49 8b 94 24 c8 b2 19 a0 48 c7 c6 19 b4 19 a0 eb a6 48 8b 83 e8 02 00 00 <4c> 8b 60 50 e8 38 12 00 00 49 89 c5 e9 2b ff ff ff 55 48 89 e5
[ 695.156361] RIP [<ffffffffa01988cf>] show_protocols+0x11f/0x130 [rc_core]
[ 695.156374] RSP <ffff8803fdfdde48>
[ 695.156377] CR2: 0000000000000050
[ 695.156383] ---[ end trace e4ccb47ce256ac3e ]---

[Alvaro Leal (Effenberg0x0) (effenberg0x0)]

Additional information: As it turns out, it becomes impossible to use ANY USB device after this. Plugging /; unplugging USB sticks, receivers, external HDD, headphone, keyboard, mouse doesn't work. Dmesg shows nothing when these devices are connected and disconnected from any USB port.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 873110

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Alvaro Leal (Effenberg0x0) (effenberg0x0)]

CHanges to confirmed as this is not perceived by apport, yet is fully reproducible.

[penalvch (penalvch)]

Alvaro Leal, thank you for reporting this bug and helping make Ubuntu better. This bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]