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[Bug 709440] [vp702x] BUG: unable to handle kernel NULL pointer dereference at (null)

https://bugzilla.novell.com/show_bug.cgi?id=709440

https://bugzilla.novell.com/show_bug.cgi?id=709440#c11


Markus Stephan <markus_stephan@xxxxxxxxxx> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |ASSIGNED
InfoProvider|markus_stephan@xxxxxxxxxx |

--- Comment #11 from Markus Stephan <markus_stephan@xxxxxxxxxx> 2011-08-20
15:56:40 UTC ---

It will appear at:
http://download.opensuse.org/repositories/home:/jirislaby:/vp702x/standard/

I downloaded and installed the test kernel but unfortunately the patch did not
fix the problem. The BUG seams to be now after the initialization phase of the
driver:

..
[ 21.042793] BIOS EDD facility v0.16 2004-Jun-25, 1 devices found
[ 21.458347] r8169 0000:03:00.0: eth0: link up
[ 21.459145] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 32.314029] eth0: no IPv6 routers present
[ 39.501763] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 39.501775] IP: [<ffffffff8158b9ed>] __mutex_lock_slowpath+0xad/0x1b0
[ 39.501786] PGD 37b63067 PUD 6a09f067 PMD 0
[ 39.501792] Oops: 0002 [#1] PREEMPT SMP
[ 39.501797] CPU 0
[ 39.501799] Modules linked in: snd_pcm_oss snd_mixer_oss snd_seq
snd_seq_device edd cpufreq_conservative cpufreq_userspace cpufreq_powersave
powernow_k8 mperf fuse dm_mod snd_hda_codec_hdmi snd_hda_codec_realtek
dvb_usb_vp702x dvb_usb dvb_core arc4 ir_lirc_codec lirc_dev joydev
snd_hda_intel ir_sony_decoder ir_jvc_decoder sr_mod ir_rc6_decoder r8169
snd_hda_codec rc_rc6_mce ir_rc5_decoder firewire_ohci snd_hwdep snd_pcm ath5k
firewire_core sg edac_core cdrom edac_mce_amd sp5100_tco i2c_piix4 ite_cir
ir_nec_decoder rc_core k8temp pcspkr ath snd_timer shpchp snd pci_hotplug
serio_raw mac80211 cfg80211 soundcore rfkill snd_page_alloc button crc_itu_t
radeon ttm drm_kms_helper i2c_algo_bit drm fan thermal processor thermal_sys
ata_generic pata_atiixp
[ 39.501868]
[ 39.501871] Pid: 2373, comm: mythbackend Not tainted 3.0.3-1-desktop #1 Acer
Aspire L5100/FRS690L
[ 39.501879] RIP: 0010:[<ffffffff8158b9ed>] [<ffffffff8158b9ed>]
__mutex_lock_slowpath+0xad/0x1b0
[ 39.501887] RSP: 0018:ffff880037b87bf0 EFLAGS: 00010246
[ 39.501890] RAX: 0000000000000000 RBX: ffff880068fd9800 RCX:
ffff88006b8f8007
[ 39.501895] RDX: ffff880037b87c00 RSI: 0000000000000001 RDI:
ffff880068fd9804
[ 39.501899] RBP: ffff880068fd9804 R08: 00000000007cacd0 R09:
0000000000000002
[ 39.501903] R10: 00007ffff5928a60 R11: 0000000000000246 R12:
00000000ffffffff
[ 39.501908] R13: 0000000000000001 R14: ffff880069fd2800 R15:
ffff880068fd9808
[ 39.501913] FS: 00007f81de79f760(0000) GS:ffff88006fc00000(0000)
knlGS:0000000000000000
[ 39.501918] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 39.501921] CR2: 0000000000000000 CR3: 0000000037b32000 CR4:
00000000000006f0
[ 39.501926] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 39.501931] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 39.501935] Process mythbackend (pid: 2373, threadinfo ffff880037b86000,
task ffff880069fd2800)
[ 39.501940] Stack:
[ 39.501942] 0000000100000001 0000000000000001 ffff880068fd9808
0000000000000000
[ 39.501949] 0000000000000286 0000000000000001 00000000000000c3
ffff880068fd9800
[ 39.501955] ffff88006b8f8000 0000000000000001 ffff8800378b1c00
00000000ffffffa1
[ 39.501961] Call Trace:
[ 39.501973] [<ffffffff8158b61a>] mutex_lock+0x1a/0x40
[ 39.501982] [<ffffffffa03ff9d7>] vp702x_fe_set_voltage+0x57/0xa0
[dvb_usb_vp702x]
[ 39.502006] [<ffffffffa03ec8c6>] dvb_frontend_ioctl_legacy+0x516/0xa10
[dvb_core]
[ 39.502008] [<ffffffffa03ed64a>] dvb_frontend_ioctl+0x11a/0x140 [dvb_core]
[ 39.502008] [<ffffffffa03e2ab7>] dvb_usercopy+0xb7/0x1b0 [dvb_core]
[ 39.502008] [<ffffffffa03e2be0>] dvb_generic_ioctl+0x30/0x40 [dvb_core]
[ 39.502008] [<ffffffff8116efc4>] do_vfs_ioctl+0x84/0x2d0
[ 39.502008] [<ffffffff8116f2a8>] sys_ioctl+0x98/0xa0
[ 39.502008] [<ffffffff81594452>] system_call_fastpath+0x16/0x1b
[ 39.502008] [<00007f81da5dbce7>] 0x7f81da5dbce6
[ 39.502008] Code: 6b 04 4c 8d 7b 08 41 bc ff ff ff ff 48 89 ef e8 aa 18 00
00 48 8b 43 10 48 8d 54 24 10 4c 89 7c 24 10 48 89 53 10 48 89 44 24 18
[ 39.502008] 89 10 44 89 e0 4c 89 74 24 20 87 03 83 f8 01 74 58 44 89 e0
[ 39.502008] RIP [<ffffffff8158b9ed>] __mutex_lock_slowpath+0xad/0x1b0
[ 39.502008] RSP <ffff880037b87bf0>
[ 39.502008] CR2: 0000000000000000
[ 39.502154] ---[ end trace 684f0ea49186916b ]---
[ 39.502162] note: mythbackend[2373] exited with preempt_count 2

I will send a report to the author of the patch.

Thank you.

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