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Date:      Wed, 22 Feb 1995 16:53:00 GMT
From:      Charlie Root <root@mother.cdrom.com>
To:        bugs@FreeBSD.org
Cc:        julian@FreeBSD.org
Subject:   panic while accessing tape drive..
Message-ID:  <199502221653.QAA00158@mother.cdrom.com>

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I'm getting this with my Archive Python 4mm drive these days.  Kernel dump
available on request (haven't got DODUMP in the kernel yet, but will
remedy that).

Kernel boot messages, just to show what I've got here:

bt0 at 0x330 irq 10 on isa
bt0 targ 0 lun 0: type 0(direct) fixed SCSI2
bt0 targ 0 lun 0: <SEAGATE ST15150N        0014>
sd0: 4095MB (8388315 total sec), 3712 cyl, 21 head, 107 sec, bytes/sec 512
bt0 targ 2 lun 0: type 1(sequential) removable SCSI2
bt0 targ 2 lun 0: <EXABYTE EXB-85058SQANXR106M0>
st0: density code 0x0,  drive empty
bt0 targ 4 lun 0: type 5(readonly) removable SCSI2
bt0 targ 4 lun 0: <TOSHIBA CD-ROM XM-3501TA3054>
cd0(bt0:4:0): NOT READY asc:3a
cd0: could not get size
cd0: drive empty
bt0 targ 6 lun 0: type 1(sequential) removable SCSI2
bt0 targ 6 lun 0: <ARCHIVE Python 28388-XXX4.98>
st1: density code 0x13, 512-byte blocks, write-enabled

Do a tar tvf /dev/rst1 and you get:

st1: bad request, must be between 0 and 0
st1(bt0:6:0): 

Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0xc00
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xf011263f
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= Idle
interrupt mask		= bio 
panic: page fault

syncing disks... 

I know that without a backtrace it's less than trivial to know
exactly what's going on, but on the off-chance that this sparks
a "oh, right!" kinda response I figured I'd post it.

					Jordan



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