Bug 738023

CONTEXT: Recently, my dvd unit broke, the tray cannot be opened, a clip must be used but after that, the system must be power-cycled. 

Description of problem: 
I booted whit that problem (and no power cycle) and then the dvd unit worsened, flooding the log with i/o error (ok, it is empty and broken).

The problem is that:
* nothing depends on it, so the boot process must continue and the error/retry/whatever should continue in the "background".

I was forced to open the case and hot-remove the dvd unit's sata data cable, then systemd (or dracut) let the boot process continue.

If it is not systemd's issue please reassign (dracut/udisks/kernel?).

The dvd unit is broken, but the boot process must continue.
Thanks in advance.

Version-Release number of selected component (if applicable):

kernel   2.6.40.4-5.fc15.x86_64
systemd  26-9.fc15
dracut   009-12.fc15

How reproducible:
-

Steps to Reproduce:
1. bad luck, dvd unit goes wild.
2. cannot boot unless the dvd unit is either powered off or disconected

  
Actual results:
cannot boot if the dvd unit breaks and is keept attached to the system.

Expected results:
to be able to boot, sice it is not a hard disk and no filesystem is expected to be able to be accesed by default on it (that may block the boot process)

Additional info:
I know that a hw problem may iclude weirdness, but i think it still must boot in that specific case. (unless the sata controller itself gets confused). What could happen if such weirness happens to a hard disk witch is part of a mirror and it could not boot even if the other disk is ok? (very-very unlikely but...).

Sep 13 12:01:26 xxxx kernel: [   14.077650] end_request: I/O error, dev sr0, sector 0
Sep 13 12:01:26 xxxx kernel: [   14.077685] Buffer I/O error on device sr0, logical block 0
Sep 13 12:01:26 xxxx kernel: [   24.149657] sr 3:0:0:0: [sr0] Unhandled sense code
Sep 13 12:01:26 xxxx kernel: [   24.149693] sr 3:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Sep 13 12:01:26 xxxx kernel: [   24.149743] sr 3:0:0:0: [sr0]  Sense Key : Medium Error [current] 
Sep 13 12:01:26 xxxx kernel: [   24.149790] sr 3:0:0:0: [sr0]  Add. Sense: L-EC uncorrectable error
Sep 13 12:01:26 xxxx kernel: [   24.149839] sr 3:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Sep 13 12:01:26 xxxx kernel: [   24.149912] end_request: I/O error, dev sr0, sector 0
Sep 13 12:01:26 xxxx kernel: [   24.149947] Buffer I/O error on device sr0, logical block 0
Sep 13 12:01:26 xxxx kernel: [   34.120153] sr 3:0:0:0: [sr0] Unhandled sense code
Sep 13 12:01:26 xxxx kernel: [   34.122556] sr 3:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Sep 13 12:01:26 xxxx kernel: [   34.124981] sr 3:0:0:0: [sr0]  Sense Key : Medium Error [current] 
Sep 13 12:01:26 xxxx kernel: [   34.127418] sr 3:0:0:0: [sr0]  Add. Sense: L-EC uncorrectable error
Sep 13 12:01:26 xxxx kernel: [   34.129863] sr 3:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Sep 13 12:01:26 xxxx kernel: [   34.132325] end_request: I/O error, dev sr0, sector 0
Sep 13 12:01:26 xxxx kernel: [   34.134744] Buffer I/O error on device sr0, logical block 0
Sep 13 12:01:26 xxxx kernel: [   44.192274] sr 3:0:0:0: [sr0] Unhandled sense code
Sep 13 12:01:26 xxxx kernel: [   44.194668] sr 3:0:0:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Sep 13 12:01:26 xxxx kernel: [   44.197083] sr 3:0:0:0: [sr0]  Sense Key : Medium Error [current] 
Sep 13 12:01:26 xxxx kernel: [   44.199493] sr 3:0:0:0: [sr0]  Add. Sense: L-EC uncorrectable error
Sep 13 12:01:26 xxxx kernel: [   44.201912] sr 3:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00
Sep 13 12:01:26 xxxx kernel: [   44.204349] end_request: I/O error, dev sr0, sector 0
Sep 13 12:01:26 xxxx kernel: [   44.206769] Buffer I/O error on device sr0, logical block 0