Bug 15146

Created attachment 24720 [details]
/proc/cpuinfo output

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kernel log

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lspci -vvv output

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lsusb -v output on the device

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/proc/ioports output

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/proc/modules output

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/proc/scsi/scsi output

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ver_linux script output

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kernel log with sysrq-t

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proc_tty_devices output

I was asked if i was using the serial or the cdc-acm driver

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Tue, 26 Jan 2010 14:02:31 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=15146
> 
>            Summary: freeze on ppp connection (using an usb "key" modem)
>            Product: Other
>            Version: 2.5
>     Kernel Version: 2.6.32.5 x86_64 SMP
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: other_other@kernel-bugs.osdl.org
>         ReportedBy: fabio.bas@officineinformatiche.net
>         Regression: No
> 
> 
> I'm using a "Vodafone Mobile Connect" (the real producer is "Option" and
> the model is "K3760 HSPA USB STICK", FCC ID: NCMOGI0411) usb modem to
> create a ppp connection to the Internet.
> I connect the usb stick, call "usb_modeswitch" (this is needed to flip
> the device from "memory storage" mode to "modem" mode), and then run
> "pppd call vodafone".
> The connection will tipically work for 10secs to 1 minute, then the
> system will look up hard:
> - video show a still image
> - keyboard leds doesn't switch their state (caps lock, num lock, ...
> doesn't work)
> - the cpu fan start rotating at full speed.
> - No disk/network/other activity at all
> I need to "pull the plug" to force a shutdown.
> 
> The last working kernel i'm aware of is kernel 2.6.30, the first showing
> the problem 2.6.32.2
> 
> This problem was first reported here: http://lkml.org/lkml/2010/1/26/121
> 

post-2.6.30 regression, seems to be in the usb-serial area.

On Wed, Jan 27, 2010 at 04:46:33PM -0800, Andrew Morton wrote:
> > The last working kernel i'm aware of is kernel 2.6.30, the first showing
> > the problem 2.6.32.2

So 2.6.32.1 works properly?

Can you try 2.6.32.6?  I think this should now be resolved.

thanks,

greg k-h

The issue is still present in both 2.6.32.7 and 2.6.33. In the meanwhile, i've tried several different usb key modems (of a different brand, huawei) and they all works just fine.
So, i suspect that the issue could be caused by a semi-failed hardware: it's probably just a matter of this usb key bitching on the usb port. Therefore, i'm closing this ticket myself as invalid