Re: Mystery empty file

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On Thu, 06 Jun 2019 10:45:23 -0700
Adam Williamson <adamwill@xxxxxxxxxxxxxxxxx> wrote:

> On Thu, 2019-06-06 at 11:15 -0600, Chris Murphy wrote:
> > On Thu, Jun 6, 2019 at 9:49 AM Richard Ryniker
> > <ryniker@xxxxxxxxxxxx> wrote:
> > > I think you will find the file is not truly empty.  /sys is not
> > > an actual file system, merely an interface to kernel
> > > information.  There is no directory structure that records the
> > > length or other attributes of a file, as is the case for data on
> > > real media such as disks.
> > > 
> > > If you read the /sys/kernel/debug/usb/devices file, you should
> > > find the data you seek.
> > 
> > [root@fmac ~]# ls -l /sys/kernel/debug/usb/devices
> > -r--r--r--. 1 root root 0 Jun  6 10:11 /sys/kernel/debug/usb/devices
> > [root@fmac ~]# cat /sys/kernel/debug/usb/devices
> > cat: /sys/kernel/debug/usb/devices: Operation not permitted
> > [root@fmac ~]#
> > 
> > 5.2.0-0.rc3.git1.1.fc31.x86_64
> 
> Try it with enforcing=0 ?

it's https://bugzilla.redhat.com/show_bug.cgi?id=1658675 I suppose,
need to ping the kernel team ...


		Dan
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