Date:	Fri, 20 Apr 2007 12:25:13 +0200
From:	"Markus Rechberger" <markus.rechberger@....com>
To:	"Chris Murton" <chris.murton@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Oops on 2.6.21 with dvb-usb-dib0700?

Hi,

this will be fixed in upcoming kernel releases, there's already a patch 
for that in the video4linux/dvb repository on linuxtv.org.
So if you update your v4l-dvb drivers that problem shouldn't occure anymore.

http://linuxtv.org/repo/

-Markus

On 4/19/07, Chris Murton <chris.murton@...il.com> wrote:
 > Hi,
 >
 > Get an occasional Oops which can occur either when the device is in use,
 > or idle.. and it only usually happens after several hours of uptime with
 > the module and device loaded. The 'oops' seems to directly correlate
 > with the device appearing to disconnect and reconnect via USB (but
 > nothing physical has changed).
 >
 > In this example, the box was booted at 21:50 and the Oops occurred at
 > 03:13 when the device was idle:
 >
 > Apr 19 03:13:01 basil kernel: usb 2-1: USB disconnect, address 2
 > Apr 19 03:13:01 basil kernel: ehci_hcd 0000:04:08.2: qh ffff81003dbc61e0
 > (#82) state 4(has tds)
 > Apr 19 03:13:01 basil kernel: mt2060 I2C write failed
 > Apr 19 03:13:01 basil kernel: mt2060 I2C write failed
 > Apr 19 03:13:01 basil kernel: dvb-usb: Hauppauge Nova-T 500 Dual DVB-T
 > successfully deinitialized and disconnected.
 > Apr 19 03:13:02 basil kernel: usb 2-1: new high speed USB device using
 > ehci_hcd and address 3
 > Apr 19 03:13:02 basil kernel: usb 2-1: configuration #1 chosen from 1 
choice
 > Apr 19 03:13:02 basil kernel: dvb-usb: found a 'Hauppauge Nova-T 500
 > Dual DVB-T' in warm state.
 > Apr 19 03:13:02 basil kernel: **WARNING** I2C adapter driver [Hauppauge
 > Nova-T 500 Dual DVB-T] forgot to specify physical device; fi
 > x it!
 > Apr 19 03:13:02 basil kernel: dvb-usb: will pass the complete MPEG2
 > transport stream to the software demuxer.
 > Apr 19 03:13:02 basil kernel: DVB: registering new adapter (Hauppauge
 > Nova-T 500 Dual DVB-T).
 > Apr 19 03:13:02 basil kernel: **WARNING** I2C adapter driver [DiBX000
 > tuner I2C bus] forgot to specify physical device; fix it!
 > Apr 19 03:13:02 basil kernel: DVB: registering frontend 0 (DiBcom
 > 3000MC/P)...
 > Apr 19 03:13:02 basil kernel: MT2060: successfully identified (IF1 = 
1220)
 > Apr 19 03:13:02 basil kernel: dvb-usb: will pass the complete MPEG2
 > transport stream to the software demuxer.
 > Apr 19 03:13:02 basil kernel: DVB: registering new adapter (Hauppauge
 > Nova-T 500 Dual DVB-T).
 > Apr 19 03:13:02 basil kernel: **WARNING** I2C adapter driver [DiBX000
 > tuner I2C bus] forgot to specify physical device; fix it!
 > Apr 19 03:13:02 basil kernel: DVB: registering frontend 1 (DiBcom
 > 3000MC/P)...
 > Apr 19 03:13:02 basil kernel: MT2060: successfully identified (IF1 = 
1220)
 > Apr 19 03:13:03 basil kernel: dvb-usb: Hauppauge Nova-T 500 Dual DVB-T
 > successfully initialized and connected.
 > Apr 19 03:17:30 basil kernel: Unable to handle kernel NULL pointer
 > dereference at 0000000000000000 RIP:
 > Apr 19 03:17:30 basil kernel:  [<ffffffff804a4af2>]
 > __mutex_lock_interruptible_slowpath+0x22/0x99
 > Apr 19 03:17:30 basil kernel: PGD 13042067 PUD 13043067 PMD 0
 > Apr 19 03:17:30 basil kernel: Oops: 0002 [1]
 > Apr 19 03:17:30 basil kernel: CPU 0
 > Apr 19 03:17:30 basil kernel: Modules linked in: nvidia(P) snd_mpu401
 > snd_mpu401_uart snd_seq_midi snd_seq_midi_event snd_hda_intel
 > snd_hda_codec snd_seq snd_pcm_oss snd_mixer_oss dvb_usb_dib0700 dib7000m
 > dib7000p dvb_usb snd_rawmidi dvb_core snd_pcm snd_timer snd
 > _seq_device lirc_imon lirc_mceusb2 lirc_dev dvb_pll dib3000mc
 > dibx000_common mt2060 snd_page_alloc
 > Apr 19 03:17:30 basil kernel: Pid: 7860, comm: mythbackend Tainted:
 > P      2.6.20 #1
 > Apr 19 03:17:30 basil kernel: RIP: 0010:[<ffffffff804a4af2>] 
 > [<ffffffff804a4af2>] __mutex_lock_interruptible_slowpath+0x22/0x99
 > Apr 19 03:17:30 basil kernel: RSP: 0018:ffff81002e929ea8  EFLAGS: 
00010292
 > Apr 19 03:17:30 basil kernel: RAX: ffffc200101ad0a0 RBX:
 > ffffc200101ad098 RCX: 0000000000000000
 > Apr 19 03:17:30 basil kernel: RDX: ffff81002e929fd8 RSI:
 > ffff8100331ee980 RDI: ffffc200101ad098
 > Apr 19 03:17:30 basil kernel: RBP: ffff810034403200 R08:
 > 0000000000000000 R09: 0000000000001eb4
 > Apr 19 03:17:30 basil kernel: R10: 0000000000000000 R11:
 > 0000000000000206 R12: ffffc200101ad098
 > Apr 19 03:17:30 basil kernel: R13: ffff81003cff7418 R14:
 > ffff81003da1a8c0 R15: ffff81003c997b70
 > Apr 19 03:17:30 basil kernel: FS:  000000004a816960(0063)
 > GS:ffffffff80615000(0000) knlGS:00000000f7db58c0
 > Apr 19 03:17:30 basil kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
 > 000000008005003b
 > Apr 19 03:17:30 basil kernel: CR2: 0000000000000000 CR3:
 > 0000000013041000 CR4: 00000000000006e0
 > Apr 19 03:17:30 basil kernel: Process mythbackend (pid: 7860, threadinfo
 > ffff81002e928000, task ffff810034403200)
 > Apr 19 03:17:30 basil kernel: Stack:  ffffc200101ad0a0 0000000000000000
 > 0000000000000000 0000000800000000
 > Apr 19 03:17:30 basil kernel:  ffff81003c542fa0 ffffc200101ad000
 > ffff81003c542fa0 ffffffff88043d22
 > Apr 19 03:17:30 basil kernel:  0000000000000008 ffff8100331ee980
 > ffff81003cff7418 ffffffff802618ec
 > Apr 19 03:17:30 basil kernel: Call Trace:
 > Apr 19 03:17:30 basil kernel:  [<ffffffff88043d22>]
 > :dvb_core:dvb_demux_release+0x37/0xba
 > Apr 19 03:17:30 basil kernel:  [<ffffffff802618ec>] __fput+0xb1/0x164
 > Apr 19 03:17:30 basil kernel:  [<ffffffff8023671d>] 
hrtimer_wakeup+0x0/0x21
 > Apr 19 03:17:30 basil kernel:  [<ffffffff8025f3ec>] filp_close+0x5d/0x65
 > Apr 19 03:17:30 basil kernel:  [<ffffffff8026046d>] sys_close+0x76/0xaf
 > Apr 19 03:17:30 basil kernel:  [<ffffffff802092be>] system_call+0x7e/0x83
 > Apr 19 03:17:30 basil kernel:
 > Apr 19 03:17:30 basil kernel:
 > Apr 19 03:17:30 basil kernel: Code: 48 89 21 48 89 4c 24 08 48 89 6c 24
 > 10 48 83 c8 ff 87 03 ff
 > Apr 19 03:17:30 basil kernel: RIP  [<ffffffff804a4af2>]
 > __mutex_lock_interruptible_slowpath+0x22/0x99
 > Apr 19 03:17:30 basil kernel:  RSP <ffff81002e929ea8>
 > Apr 19 03:17:30 basil kernel: CR2: 0000000000000000
 >
 > If you need any more diagnostics or information from me, just let me 
know.
 >
 > Thanks
 > Chris
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