Comment 68 for bug 228624

Quote: "Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks."

Does that mean a) this bug is not yet accepted as being an actual, reproducible bug and b) the ubuntu kernel team are not working on it?

It would be great to see some progress on this; it has bedevilled backup verification since early November 08 (before that a reboot normally cleared "Input/output error" when running cksum on the backup files on DVD). Intermittent but increasingly frequent errors plagued backups until the "all_generic_ide=1" workaround (and maybe some package upgrades because the workaround was not fully effective immediately) made backup verification routine.

I'd pretty much got to the point where any "Input/output error"s could be attributed to defective media but last night's package upgrades have brought it back (there's a new /boot/initrd.img-2.6.24-19-generic file). Solid! Grr! :-( How to back out the upgrade and which package(s) to try backing out?

I've half an idea that media automounting contributes to the problem but cannot remember how to disable it. Suggestions welcome.

Having the DVD drive mounted in a VirtualBox VM seemed to make it worse.

For what it's worth here are the latest errors from /var/log/messages (similar in kern.log and syslog):

Feb 5 20:27:25 CW8 kernel: [22368.027815] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Feb 5 20:27:25 CW8 kernel: [22368.027824] sr 0:0:0:0: [sr0] Sense Key : Medium Error [current]
Feb 5 20:27:25 CW8 kernel: [22368.027829] Info fld=0x144bc0
Feb 5 20:27:25 CW8 kernel: [22368.027830] sr 0:0:0:0: [sr0] Add. Sense: Unrecovered read error
Feb 5 20:27:25 CW8 kernel: [22368.027834] end_request: I/O error, dev sr0, sector 5320448
Feb 5 20:27:25 CW8 kernel: [22368.027838] printk: 3 messages suppressed.
Feb 5 20:27:26 CW8 kernel: [22368.852262] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
Feb 5 20:27:26 CW8 kernel: [22368.852269] sr 0:0:0:0: [sr0] Sense Key : Medium Error [current]
Feb 5 20:27:26 CW8 kernel: [22368.852273] Info fld=0x144bc0
Feb 5 20:27:26 CW8 kernel: [22368.852275] sr 0:0:0:0: [sr0] Add. Sense: Unrecovered read error
Feb 5 20:27:26 CW8 kernel: [22368.852279] end_request: I/O error, dev sr0, sector 5320448
Feb 5 20:29:53 CW8 kernel: [22446.346388] VFS: busy inodes on changed media.
Feb 5 20:31:16 CW8 kernel: [22489.833821] cdrom: This disc doesn't have any tracks I recognize!
Feb 5 20:31:36 CW8 kernel: [22500.030985] cdrom: This disc doesn't have any tracks I recognize!
Feb 5 20:44:48 CW8 -- MARK --
Feb 5 20:52:44 CW8 kernel: [23188.448815] attempt to access beyond end of device
Feb 5 20:52:44 CW8 kernel: [23188.448823] sr0: rw=0, want=68, limit=4
Feb 5 20:52:44 CW8 kernel: [23188.448829] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16
Feb 5 20:53:28 CW8 kernel: [23211.981941] attempt to access beyond end of device
Feb 5 20:53:28 CW8 kernel: [23211.981948] sr0: rw=0, want=68, limit=4
Feb 5 20:53:28 CW8 kernel: [23211.981953] isofs_fill_super: bread failed, dev=sr0, iso_blknum=16, block=16

Best

Charles