On Fri, Apr 18, 2014 at 2:11 PM, Ben Hutchings <b...@decadent.org.uk> wrote:

>> Apr 17 09:24:08 teenymac kernel: [1201449.213969] usb 2-5: USB disconnect, 
>> device number 18
>
> Drive removed.

 yes. bit of a melt-down on another USB hub, i had to unplug it (and
the attached nothing-to-do-with-the-USB-DVD-drive USB hub).

>> Apr 17 09:30:02 teenymac kernel: [1201802.581323] Read(10): 28 00 00 00 00 
>> 00 00 00 01 00
>
> I don't understand why there is attempted I/O to a device that was
> physically removed 6 minutes earlier!  Maybe something has kept the
> block device open, but no other processes should be allowed to open it.

 there aren't any.  i'm running fvwm, and commands are run explicity.
 i usually use curses-based tools, explicitly typed from the command
 line in an xterm.

 so there's no gnome or kde or any kind of file managers, file commanders,
 nothing.  nothing that could  be f******g around without my knowledge or
 permission, and that's the way i like it :)

 the only other thing is: there is actually a built-in CD/DVD drive, listed
 as /dev/cdrom1 (not /dev/cdrom), so the USB device came up as
 /dev/cdrom11 - all a bit weird, but hey.

>> Apr 17 09:33:07 teenymac kernel: [1201988.327917] sr1: scsi3-mmc drive: 
>> 62x/24x writer dvd-ram cd/rw xa/form2 cdda tray
>> Apr 17 09:33:07 teenymac kernel: [1201988.328255] sr 9:0:0:0: Attached scsi 
>> CD-ROM sr1
>
> Drive reattached.  Note it's now 'sr1', as 'sr0' seems to still be
> hanging around.

 .... or it might have been the other DVD drive (apologies i might have given
 you too much kmesg with not enough context).

 so sr0 is the internal DVD writer, sr1 is the external (USB) one.

> This looks similar to (though not quite the same as)
> <https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1283604> which is
> supposed to be fixed in 3.15.  The fixes might get into Debian sooner
> than that, although James Bottomley recommended waiting some time to see
> if this causes regressions in 3.15.

 ok

> [snip]

> More attempted I/O to 'sr0' which was supposed to be removed 15 minutes
> ago.

 probably the internal DVD

>> Apr 17 09:42:12 teenymac kernel: [1202533.365582] sr 0:0:0:0: Attached scsi 
>> CD-ROM sr0
> [...]
>
> sr_mod module reinserted, tries to re-register the block queue for sr0.

 unf??   ok so that's definitely happening on the internal drive, not
the external one.

l.


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