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SubjectSCSI Tape hangs when no tape loaded (2.5.6x)


On both 2.5.60 and 2.5.61 when there is no tape loaded in my SCSI DAT
tape drive, access to the drive blocks for exactly 2 minutes
before timing out and giving an I/O error.

# mt stat
....... < 2 minutes later > ...
/dev/tape: Input/output error

< me putting a tape in the unit>

# mt stat
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 0 bytes. Density code 0x25 (DDS-3).
Soft error count since last status=0
General status bits on (45010000):
BOT WR_PROT ONLINE IM_REP_EN

I don't remember seeing this on earlier 2.5.5[0-3] or so kernels,
looks like a bug in the SCSI layer.

Output from dmesg (2.5.61):

SCSI subsystem driver Revision: 1.00
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.8
<Adaptec 2940A Ultra SCSI adapter>
aic7860: Ultra Single Channel A, SCSI Id=7, 3/253 SCBs

Vendor: HP Model: C1537A Rev: L105
Type: Sequential-Access ANSI SCSI revision: 02
Vendor: PLEXTOR Model: CD-ROM PX-20TS Rev: 1.02
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TOSHIBA Model: DVD-ROM SD-M1201 Rev: 1R08
Type: CD-ROM ANSI SCSI revision: 02
Vendor: YAMAHA Model: CRW8424S Rev: 1.0j
Type: CD-ROM ANSI SCSI revision: 02
st: Version 20020805, bufsize 32768, wrt 30720, max init. bufs 4, s/g
segs 16
Attached scsi tape st0 at scsi0, channel 0, id 2, lun 0
Attached scsi CD-ROM sr0 at scsi0, channel 0, id 3, lun 0
Attached scsi CD-ROM sr1 at scsi0, channel 0, id 5, lun 0
Attached scsi CD-ROM sr2 at scsi0, channel 0, id 6, lun 0
(scsi0:A:3): 10.000MB/s transfers (10.000MHz, offset 15)
sr0: scsi-1 drive
Uniform CD-ROM driver Revision: 3.12
(scsi0:A:5): 20.000MB/s transfers (20.000MHz, offset 15)
sr1: scsi3-mmc drive: 32x/32x cd/rw xa/form2 cdda tray
(scsi0:A:6): 20.000MB/s transfers (20.000MHz, offset 15)
sr2: scsi3-mmc drive: 24x/16x writer cd/rw xa/form2 cdda tray

--
Ruud Linders

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