Re: [gentoo-user] USB Problems

[john]

On Sun, 12 Jun 2011 16:45:38 +0200
meino.cramer@×××.de wrote:

> john <jdm@×××××××××××××××××××.uk> [11-06-12 16:36]:
> > Gents
> >
> > Whenever I insert external USB device my machine locks and I have
> > to do a hard reset (sys req does not even work). I have tried this
> > in a graphical environment and without. Machine boots up fine with
> > USB keyboard and mouse but will not boot up with usb storage
> > (memory stick
> > - tried several)
> >
> > I have recently upgrade kernel to 2.6.38-r6 when this error started
> > (approx). Hav also tried 2.6.38-r7 (which according to bugzilla
> > should fix an issue similar to this) the error still happens.
> >
> > Any suggestions on kernel config options, debugging would be
> > appreciated. And how to trap full error message.
> >
> > Error message alongs these lines
> >
> > Kernel panic not syncing - fatal exception in iterrupt
> > ksoftirqd/1 Not tainted
> >
> >
> >
> >
> > --
> > --------------
> > --------------
> > John D Maunder
> > jdm@×××××××××××××××××××.uk
> >
>
> Hi John,
>
> may be this could help to track th eerror more closely:
> Recompile the kernel with CONFIG_USB_DEBUG set.
> If not already done, enable CONFIG_MAGIC_SYSRQ and
> read about the available commands in the according
> docs under /usr/src/linux/Documentation/.
> This is a overall life saver in many other cases too.
> But it may be a security hole also -- you can disable
> it in /proc/ later.
> If possible change /etc/fstab to mount the partition
> to which logging will go with the "sync" option so
> every log entry will go directly onto the bare metal
> instead of a RAM buffer.
>
> Reboot into console mode (no X).
> cd to the logging directory and
> do a tail -f onto the logfile in question
>
> Insert the "USB stick of death" ;) and
> see, whether you can see anything in the
> tailed log.
>
> If not do the magic sysrq dance to sync hds,
> remount readonly and finally reboot.
>
> Take a closer look into the resulting logs.
>
> Good luck!
>
> Nevertheless have a nice weekend!
> Best regards,
> mcc
>
>
>

Thanks mmc,
CONFIG_MAGIC_SYSRQ and CONFIG_USB_DEBUG set to y

When I plug in USB device SYSREQ does not work. I have tested when
system is normal and all ok with SYSREQ so USB device is locking up
system completely.

I have put sync in mount table but when device is inserted error log
is not being produced (in /var/log/messages, etc). I may end up having
to take a photo of error log(lol). Or there maybe some other way of
catching error which Gentoo gurus may advise.

I have tried 3 memory sticks and they all lock system up. These work
on another PC using Arch and work on this PC dual booting with Windows.
I have a usb hard drive which works ok so it is a memory stick only
issue!!!!????

Hmmm. 

-- 
--------------
--------------
John D Maunder
jdm@×××××××××××××××××××.uk