Public bug reported:
I have a broken CDROM (one that has read errors, a toaster). Using this
CD-ROM renders my system unresponsive - it will have a high CPU load or
will sometimes even freeze from 10 to 60 seconds.
Kernel log says things like:
Nov 15 17:05:51 stout kernel: [17182964.856000] Info fld=0xe
Nov 15 17:05:51 stout kernel: [17182964.856000] end_request: I/O error, dev
sr0, sector 56
Nov 15 17:05:51 stout kernel: [17182964.856000] Buffer I/O error on device sr0,
logical block 7
Nov 15 17:06:09 stout kernel: [17182982.868000] sr 0:0:1:0: SCSI error: return
code = 0x8000002
Nov 15 17:06:09 stout kernel: [17182982.868000] sr0: Current: sense key: Medium
Error
Nov 15 17:06:09 stout kernel: [17182982.868000] Additional sense: No seek
complete
Nov 15 17:06:09 stout kernel: [17182982.868000] Info fld=0x0
Nov 15 17:06:09 stout kernel: [17182982.868000] end_request: I/O error, dev
sr0, sector 0
Nov 15 17:06:09 stout kernel: [17182982.868000] Buffer I/O error on device sr0,
logical block 0
Nov 15 17:06:27 stout kernel: [17183000.892000] sr 0:0:1:0: SCSI error: return
code = 0x8000002
Nov 15 17:06:27 stout kernel: [17183000.892000] sr0: Current: sense key: Medium
Error
Nov 15 17:06:27 stout kernel: [17183000.892000] Additional sense: No seek
complete
... which is correct, as the CD I'm using is broken. But this should not
freeze the system to the extent where you even think it's unusable
(namely: 60 seconds or more).
My feeling says that this is some sort of non-reentrancy in the SATA
layer, where a CD-ROM reading problem will block requests to the HDD,
but this is just speculation.
Core2 duo, 82801GB/GR/GH (ICH7 Family) Serial ATA Storage Controller,
driver=ata_piix
ST3320620AS hdd and Optiarc DVD RW AD-7170S 1.00 Oct27,2006
2.6.15-28-686 #1 SMP PREEMPT Wed Jul 18 22:57:30 UTC 2007
Ubuntu 6.06.1 LTS
This bug seems to relate to #75295 but seems different.
** Affects: linux-source-2.6.15 (Ubuntu)
Importance: Undecided
Status: New
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SATA CD/DVD I/O error render system unresponsive, 100% cpu load
https://bugs.launchpad.net/bugs/162908
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