[Bug 162908] SATA CD/DVD I/O error render system unresponsive, 100% cpu load

[Valentijn Sessink]

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

-- 
SATA CD/DVD I/O error render system unresponsive, 100% cpu load
https://bugs.launchpad.net/bugs/162908
You received this bug notification because you are a member of Kernel
Bugs, which is a bug contact for linux-source-2.6.15 in ubuntu.