Re: usb_id segfaulting on 2.6.23

[Oliver Neukum <oneukum@suse.de>]

Am Dienstag 06 November 2007 schrieb Kay Sievers:
> On Tue, 2007-11-06 at 00:42 +0000, Daniel Drake wrote:
> > Kay Sievers wrote:
> > > Strange, seems some attributes are not catched by udev. What does
> > > "udevinfo" print for the working setup? Do you see the missing
> > > attributes there?
> > 
> > You're referring to idVendor, idProduct, etc. Actually, those attributes 
> > don't even exist in sysfs(!!) which must be the root of the problem.
> > 
> > So, I bisected the kernel. Ready for a strange result?
> > First bad commit is 296699de: Introduce CONFIG_SUSPEND for 
> > suspend-to-Ram and standby
> > 
> > On this system, I always disable suspend/hibernate/etc support, and 
> > continued to do so throughout the bisection. This lead me to the above 
> > result.
> > 
> > On a kernel tree with HEAD as 296699de, I see the bug (no idVendor, etc) 
> > when CONFIG_SUSPEND=n (my normal setup). However, if I set 
> > CONFIG_SUSPEND=y, the missing USB sysfs attributes show up!
> > 
> > On 2.6.24-rc1-git14, the same is true. CONFIG_SUSPEND=n, no idVendor 
> > nodes, udev usb_id crashes on boot. CONFIG_SUSPEND=y, idVendor and 
> > friends are back, udev behaves as normal.
> 
> I fixes usb_id in the meantime not to crash, but that's a different
> story.
> 
> > I know you have experience working with sysfs/kobject internals, do you 
> > have any suggestions or thoughts before I take this to LKML?
> 
> Oh, great, it was a complete mystery what was going wrong, maybe this is
> pointing in the right direction. We got more than one report for this
> bug.
> 
> Maybe Oliver or Alan have an idea, what could go wrong with the USB
> attributes depending on CONFIG_SUSPEND, I don't expect a driver core
> issue here.

Is bcdDevice present without CONFIG_SUSPEND? Which attributes are
present?

	Regards
		Oliver



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