Bug#744994: linux-image-3.13-1-amd64: segfault on use of external (usb) dvdrw
On Fri, Apr 18, 2014 at 2:11 PM, Ben Hutchings <ben@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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