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 Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs