On Thu, 29 Jun 2006 [EMAIL PROTECTED] wrote:

> Hi,
> 
> I am working on an tool which is used for end to end testing of a
> telephone network. As a part of the tool, we have mobiles connected to
> the system (with kernel-2.6.16.13). The mobiles(CDC devices) being used
> are USB 2.0 full speed devices and are connected to the system using USB
> 2.0 high speed hubs. The device driver used to communicate to the
> mobiles is "generic usb-serial driver". A maximum of 32 mobiles are
> connected to one root hub(UHCI port) using hubs.
> 
> One of the basic tests performed using this application is continuous
> power-on/power-off of the mobiles for 200 cycles. From the application,
> AT commands(for power-on and power-off) are passed to the mobile through
> the "generic usb serial driver". When this testing is in progress,
> suddenly system got hanged. We could not see any pointer for the system
> hang, from the logs(/var/log/messages). Till the point of time the
> system got hanged, everything seems to be normal from the logs. And as
> the system got hanged, the logging stopped suddenly.
> 
> What could be the reason for this behavior? Please find attached the
> .config file. Should I have to enable any debug options which may help
> to locate the pointer for system hang?
> Please let me know if any further information is required. Please share
> your experience.

Your .config file doesn't help at all.  But your kernel log would be a big 
help.  Please post that.

BTW, note that kernel debugging messages ususally don't end up in 
/var/log/messages.  Some systems store them in /var/log/kernel, other 
systems don't store them at all.  You may need to change your 
/etc/syslog.conf or else use dmesg to read the kernel's log buffer.

Alan Stern


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