Re: [Linux-diag-devel] update-lsvpd-db hangs on cdrom device

[Martin S. <ma...@me...>]

Hi Stephen,

>>>>> "Stephen" == Stephen Hemminger <she...@os...> writes:

    Stephen> update-lsvpd-db hangs on one of my machines. 

    Stephen> Running it with sh -x shows:

    Stephen> + local name=hdc
    Stephen> + local d=/proc/ide/hdc
    Stephen> + '[' -d /proc/ide/hdc ']'
    Stephen> + local if=/proc/ide/hdc/identify
    Stephen> + local tf=/proc/ide/hdc/media
    Stephen> + local sf=/proc/ide/hdc/settings
    Stephen> + '[' -f /proc/ide/hdc/identify -a -f /proc/ide/hdc/media -a -f /proc/ide/hdc/settings ']'
    Stephen> + local adapter device_type
    Stephen> [...]
    Stephen> + read device_type

    Stephen> On this machine hdc is th Cd-rom device (with no CD in
    Stephen> it).

First, thanks for the excellent problem report...

I don't (yet? :-) understand this one.  The line of code where you're
seeing the hang is:

  	    read device_type <"$tf"

so that's doing:

            read device_type </proc/ide/hdc/media

(We just don't see it all because the trace doesn't show redirects.)

Several questions:

* What does that file contain?  A "hexdump -C" might be most useful...
  Does the cat/hexdump command hang too?

* What happens if you try the read by hand?

* Do you get any messages from the kernel?  Obviously I'm wondering if
  something bizarre is going on in the driver...

This is weird.  I've run this against lots of (empty) CD-ROM
devices without a problem.

By the way, I noticed that 2.6.10 is giving me warnings like this:

  kernel: Warning: /proc/ide/hd?/settings interface is obsolete, and will be removed soon!

I'm pretty sure I don't see all of the information in that file
anywhere in /sys yet.  If anyone has idea idea where I might find it,
I appreciate knowing...  :-)

Thanks...

peace & happiness,
martin