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Subjectscsi medium errors cause system crash (2.1.121)
System config (till my dual 450 PII shows up :) -

486/66
kernel 2.1.121
system Red Hat 5.0 base
Ultrastor 24F EISA SCSI adapter
Iomega Jaz 1GB
<other stuff elided>

I have a faulty Jaz drive/cartridge. In fact, I have had many, and I
am about to return this one, get my money back and buy fixed storage
instead.

However, I am disturbed that for the 5th time now, medium errors on
this device cause my system to crash. Magic-SysRq doesn't work,
virtual console switching is inoperative. The only clue to the state
of things is that the main (system) disk drive LED on the front panel
is permanently lit.

I don't think that SCSI errors should ever cause a system failure. Any
ideas on whether this is a problem with the U24F driver, with the
kernel, with my 24F adapter, or what ? Below is a transcript from
/var/log/messages on the latest. It looks pretty uninteresting to
me. In general, it seems that after a certain number of medium errors
from this device, the SCSI subsystem just locks up the machine.

Nov 29 22:28:44 bd kernel: EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
Nov 29 22:31:00 bd kernel: EXT2-fs warning (device 08:21): ext2_free_blocks: bit already cleared for block 459416
Nov 29 22:31:28 bd kernel: Disc change detected.
Nov 29 22:31:28 bd kernel: VFS: Disk change detected on device 08:20
Nov 29 22:31:28 bd kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2091050 [1021 MB] [1.0 GB]
Nov 29 22:31:28 bd kernel: sdc: Write Protect is off
Nov 29 22:31:28 bd kernel: sdc: sdc4
Nov 29 22:32:09 bd kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2091050 [1021 MB] [1.0 GB]
Nov 29 22:32:09 bd kernel: sdc: Write Protect is off
Nov 29 22:32:09 bd kernel: sdc: sdc3
Nov 29 22:32:12 bd kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2091050 [1021 MB] [1.0 GB]
Nov 29 22:32:12 bd kernel: sdc: Write Protect is off
Nov 29 22:32:12 bd kernel: sdc: sdc3
Nov 29 22:32:44 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0d 00 4f 7a 00
Nov 29 22:32:44 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:44 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:44 bd kernel: scsidisk I/O error: dev 08:23, sector 852056
Nov 29 22:32:45 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0d 01 1f 24 00
Nov 29 22:32:45 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:45 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:45 bd kernel: scsidisk I/O error: dev 08:23, sector 852198
Nov 29 22:32:45 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0d 01 89 50 00
Nov 29 22:32:45 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:45 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:45 bd kernel: scsidisk I/O error: dev 08:23, sector 852340
Nov 29 22:32:45 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0d 02 37 18 00
Nov 29 22:32:45 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:45 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:45 bd kernel: scsidisk I/O error: dev 08:23, sector 852482
Nov 29 22:32:47 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0f 00 4f 58 00
Nov 29 22:32:47 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:47 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:47 bd kernel: scsidisk I/O error: dev 08:23, sector 983136
Nov 29 22:32:47 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 0f 01 b1 68 00
Nov 29 22:32:47 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:47 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:47 bd kernel: scsidisk I/O error: dev 08:23, sector 983438
Nov 29 22:32:49 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 80 4f 6c 00
Nov 29 22:32:49 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:49 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:49 bd kernel: scsidisk I/O error: dev 08:23, sector 1146978
Nov 29 22:32:49 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 81 13 30 00
Nov 29 22:32:49 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:49 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:49 bd kernel: scsidisk I/O error: dev 08:23, sector 1147102
Nov 29 22:32:50 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 81 43 5a 00
Nov 29 22:32:50 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:50 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:50 bd kernel: scsidisk I/O error: dev 08:23, sector 1147226
Nov 29 22:32:50 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 82 11 26 00
Nov 29 22:32:50 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:32:50 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:32:50 bd kernel: scsidisk I/O error: dev 08:23, sector 1147350
Nov 29 22:33:02 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 1e 00 4f 76 00
Nov 29 22:33:02 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:33:02 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:33:02 bd kernel: scsidisk I/O error: dev 08:23, sector 1966206
Nov 29 22:33:02 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 1e 01 43 4e 00
Nov 29 22:33:02 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:33:02 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:33:02 bd kernel: scsidisk I/O error: dev 08:23, sector 1966348
Nov 29 22:33:02 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 1e 01 91 9c 00
Nov 29 22:33:02 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:33:02 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:33:02 bd kernel: scsidisk I/O error: dev 08:23, sector 1966490
Nov 29 22:33:04 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 1f c0 4f 84 00
Nov 29 22:33:04 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:33:04 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:33:04 bd kernel: scsidisk I/O error: dev 08:23, sector 2080858
Nov 29 22:33:04 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 1f c0 d3 70 00
Nov 29 22:33:04 bd kernel: Current error sd08:23: sense key Medium Error
Nov 29 22:33:04 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:33:04 bd kernel: scsidisk I/O error: dev 08:23, sector 2081000
Nov 29 22:34:25 bd kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2091050 [1021 MB] [1.0 GB]
Nov 29 22:34:25 bd kernel: sdc: Write Protect is off
Nov 29 22:34:26 bd kernel: sdc: sdc1
Nov 29 22:34:31 bd kernel: SCSI device sdc: hdwr sector= 512 bytes. Sectors= 2091050 [1021 MB] [1.0 GB]
Nov 29 22:34:31 bd kernel: sdc: Write Protect is off
Nov 29 22:34:31 bd kernel: sdc: sdc1
Nov 29 22:35:08 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 80 b3 70 00
Nov 29 22:35:08 bd kernel: Current error sd08:21: sense key Medium Error
Nov 29 22:35:08 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:35:08 bd kernel: scsidisk I/O error: dev 08:21, sector 1147102
Nov 29 22:35:08 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 81 43 62 00
Nov 29 22:35:08 bd kernel: Current error sd08:21: sense key Medium Error
Nov 29 22:35:08 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:35:08 bd kernel: scsidisk I/O error: dev 08:21, sector 1147226
Nov 29 22:35:08 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 82 0f 28 00
Nov 29 22:35:08 bd kernel: Current error sd08:21: sense key Medium Error
Nov 29 22:35:08 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:35:08 bd kernel: scsidisk I/O error: dev 08:21, sector 1147350
Nov 29 22:36:59 bd kernel: scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Write (6) 11 82 4f 5c 00
Nov 29 22:36:59 bd kernel: Current error sd08:21: sense key Medium Error
Nov 29 22:36:59 bd kernel: Additional sense indicates Unrecovered read error
Nov 29 22:36:59 bd kernel: scsidisk I/O error: dev 08:21, sector 1147474

At this point, I reset the machine since it was now locked. I also
note that the data in /var/log/messages was somewhat corrupt, possibly
from another similar crash: messages from Oct 17th came after this and
before the restart message. My log files are rotated nightly. Just a
random data point.

--p

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