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Date: Fri, 23 May 1997 09:04:50 -0700 (PDT)
From: Mark Diekhans <markd@Grizzly.COM>
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Subject: kern/3671: SCSI tape drive with AHA 2940 locks up system.
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>Number:         3671
>Category:       kern
>Synopsis:       SCSI tape drive with AHA 2940 locks up system.
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 23 09:10:01 PDT 1997
>Last-Modified:
>Originator:     Mark Diekhans
>Organization:
>Release:        FreeBSD 2.2.2-RELEASE i386
>Environment:

   ASUS P55T2P4
   Pentium 166
   
    ahc0 <Adaptec 2940 SCSI host adapter> rev 0 int a irq 11
    ahc0: aic7870 Single Channel, SCSI Id=7, 16 SCBs
    ahc0 waiting for scsi devices to settle
    (ahc0:0:0): "HP C3725S 6039" type 0 fixed SCSI 2
    sd0(ahc0:0:0): Direct-Access 2047MB (4194058 512 byte sec
    (ahc0:1:0): "SEAGATE ST32550N 0015" type 0 fixed SCSI 2
    sd1(ahc0:1:0): Direct-Access 2047MB (4194058 512 byte sec
    (ahc0:2:0): "WANGTEK 6130-FS 3.04" type 1 removable SCSI
    st0(ahc0:2:0): Sequential-Access density code 0x13,  driv
    ahc0:A:5: refuses synchronous negotiation. Using asynchro
    (ahc0:5:0): "IOMEGA ZIP 100 D.09" type 0 removable SCSI 2
    sd2(ahc0:5:0): Direct-Access
    sd2(ahc0:5:0): ILLEGAL REQUEST asc:24,0 Invalid field in
    sd2 could not mode sense (4). Using ficticious geometry
    96MB (196608 512 byte sectors)


>Description:

   Writting DAT tape with 16K block size often often locks up the system.

>How-To-Repeat:

	yes | dd of=/dev/rst0 bs=16384

>Fix:

	
>Audit-Trail:
>Unformatted: