Re: BUG under kernel 2.6.23

Hi,

it could be a modulation specific problem, please try with each of the 
following init strings, hopefully one of them will solve the problem:

---
AT &F W1 +ER=1; +DR=1; +MS=V92,0
AT &F W1 +ER=1; +DR=1; +MS=V92,1
AT &F W1 +ER=1; +DR=1; +MS=V90,0
AT &F W1 +ER=1; +DR=1; +MS=V90,1
AT &F W1 +ER=1; +DR=1; +MS=V34,0
AT &F W1 +ER=1; +DR=1; +MS=V34,1
AT &F W1 +ER=1; +DR=1; +MS=V32B,0
AT &F W1 +ER=1; +DR=1; +MS=V32B,1
AT &F W1 +ER=1; +DR=1; +MS=V32,0
AT &F W1 +ER=1; +DR=1; +MS=V32,1
---

Most of these init. strings assume that you have a valid license 
installed in order to be used. If you do not have a license installed, 
it is possible that simply installing one could cure the problem, if it 
is actually a modulation specific problem.

Regards,


Jonathan
Technical specialist / Linuxant
www.linuxant.com
[email protected]



Rob Carruthers wrote:
> Hello,
> 
> Firstly let me wish you a happy and successful 2008!
> 
> I have a problem with the current driver and 2.6.23 kernels. I run
> Gentoo and have tried both the Gentoo-patched kernel sources and the
> "vanilla" sources. Both give me the same problem: when the connection is
> terminated by the other end of the line (for example, when the time
> limit of 2 hours on my connection has passed) or when the line is
> physically disconnected from the modem during a connection (which is how
> I reproduced this bug), I encounter a crash that I cannot recover from,
> which yields this message in dmesg:
> 
> -- 
> 
> BUG: unable to handle kernel NULL pointer dereference at virtual address
> 0000003c
> printing eip:
> b0425521
> *pde = 00000000
> Oops: 0002 [#1]
> PREEMPT SMP
> Modules linked in: ppp_deflate ppp_async ppp_generic slhc snd_hda_codec
> hsfusbcd2 hsfmc97sis hsfmc97ati hsfmc97ali hsfmc97via hsfmc97ich
> hsfpcibasic3                    hsfpcibasic2 hsfserial hsfengine(P)
> hsfosspec hsfsoar snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss
> wm8775 cx25840 tuner ivtv snd_hda_intel i2c_alg                   o_bit
> cx2341x snd_pcm tveeprom snd_timer videodev intel_agp v4l2_common snd
> i2c_i801 agpgart v4l1_compat i2c_core snd_page_alloc
> CPU:    1
> EIP:    0060:[<b0425521>]    Tainted: P        VLI
> EFLAGS: 00010046   (2.6.23-gentoo-r5 #1)
> EIP is at _spin_lock_irqsave+0x15/0x5d
> eax: 00000000   ebx: 0000003c   ecx: 00000001   edx: 00000202
> esi: e2152000   edi: 00000001   ebp: e2153eb4   esp: e2153e8c
> ds: 007b   es: 007b   fs: 00d8  gs: 0000  ss: 0068
> Process khsfd/modem (pid: 4933, ti=e2152000 task=e39c7540 task.ti=e2152000)
> Stack: 0000003c 00000000 b0119dfb e2153eac b0423f5d 00000001 00000126
> 00000000
>       00000126 00000000 00000020 f1347af0 00000000 000b0001 e647980c
> f134bc00
>       00000000 e647980c e2153f04 e4cd7708 ee1f4d84 e647981c e2153f04
> f1e11e07
> Call Trace:
> [<b0119dfb>] __wake_up+0x18/0x43
> [<b0423f5d>] preempt_schedule+0x40/0x56
> [<f1347af0>] cnxt_event_handler+0x1bb/0x2db [hsfserial]
> [<f1e11e07>] cnxthsf_ComCtrl_Write+0x367/0x620 [hsfengine]
> [<f1e3b283>] hsfengine1972_+0x7b3/0x800 [hsfengine]
> [<f1e39630>] hsfengine1787_+0x470/0xdc0 [hsfengine]
> [<f13e1150>] cnxthsf_OsLockUnlock+0x31/0x41 [hsfosspec]
> [<f1e39414>] hsfengine1787_+0x254/0xdc0 [hsfengine]
> [<f13e1edf>] TimerThreadFunction+0x27/0x5b [hsfosspec]
> [<f13e1be4>] cnxt_thread+0x16c/0x1c3 [hsfosspec]
> [<b011b388>] default_wake_function+0x0/0xc
> [<f13e1a78>] cnxt_thread+0x0/0x1c3 [hsfosspec]
> [<b01034fb>] kernel_thread_helper+0x7/0x1c
> =======================
> Code: 8b 0b 85 c9 7e f1 eb b5 66 90 e8 18 ea ff ff eb d6 e9 9b ff ff ff
> 56 53 89 c3 89 e6 81 e6 00 e0 ff ff 83 46 14 01 9c 5a fa 31 c0 <86> 03
> 84 c0 7                   e 0c c7 43 04 00 00 00 00 89 d0 5b 5e c3 52 9d 83
> EIP: [<b0425521>] _spin_lock_irqsave+0x15/0x5d SS:ESP 0068:e2153e8c
> note: khsfd/modem[4933] exited with preempt_count 1
> 
> -- 
> 
> I am not a kernel hacker so I can't make much sense of this trace, and
> several searches later I still can't see what the problem is. Do you
> have any ideas?
> 
> Hope this helps, thanks in advance.
> 
> Rob
> 
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