Messages in this thread | | | Date | Wed, 12 Dec 2012 01:41:09 +0100 | From | Bruno Prémont <> | Subject | Re: "attempt to access beyond end of device" on DVD |
| |
Hello,
On Mon, 10 December 2012 Jacek Poplawski <jacekpoplawski@gmail.com> wrote: > few years ago I noticed annoying bug on Linux, when I was copying > photos from old DVDs I realized that not all files were copied > correctly, there were errors on last files on DVD, you could say "well > that happens, DVD are faulty", but that's not the real issue > > when the problem appears it happens on each DVD I am trying to copy, > last files on each disk have errors.... > > ...until I reboot Linux, then there are no errors at all and full DVD > is copied correctly. > > Now I needed some files from DVDs and I realized the problem still > exists. After at least three years. I verified that reboot helps and I > also noticed the problem doesn't exist on Windows 7. > > And looks like I wasn't only one who found this: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/404472 > > Problem was reported in 2009 on 2.6.28 and closed in 2012. But I > noticed it in last days. > > my system is: > > Linux version 3.6.8-1-ARCH (tobias@T-POWA-LX) (gcc version 4.7.2 (GCC) > ) #1 SMP PREEMPT Mon Nov 26 22:10:40 CET 2012 > > dmesg: > > [ 4017.384169] attempt to access beyond end of device > [ 4017.384171] sr0: rw=0, want=8511124, limit=8433216 > [ 4017.384174] attempt to access beyond end of device > [ 4017.384175] sr0: rw=0, want=8510876, limit=8433216 > > I suspect that people just stopped using CDs and DVDs and that's why > nobody was looking on this problem, or maybe the first though was > always "that DVD is broken, trash it". > > Is there more information I could give you about this issue? Or could > you point me to any ways I could debug it? It's fully reproducible on > my system.
Hm, could it be related to some kind of read-ahead? I vaguely remember seeing mails about read-ahead and/or end-of-device. Could this be somehow related?
See: - https://lkml.org/lkml/2012/12/3/497 - https://lkml.org/lkml/2012/12/3/510
This applies to 3.7-rc but according to the thread it might still have some interesting things that could be related to what you are seeing.
When it happens, does ejecting and re-inserting the CDs/DVDs also fix the problem or is a full reboot mandatory?
Bruno
| |