[Xen-bugs] [Bug 372] New: Dom0 reboots instantly when accessing SCSI DLT tape drive

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=372

           Summary: Dom0 reboots instantly when accessing SCSI DLT tape
                    drive
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: nospam@xxxxxxxxxxxxxx


I'm having a problem where whenever the bacula software attempts to communicate
with my DLT drive through an Adaptec AHA-2944UW SCSI controller under a Linux
2.6.12.6-xen0 system, the entire system instantly reboots.  If any errors are
displayed, it reboots too fast for me to see them.  If I boot to a non-xen
2.6.12.6 kernel with mostly the same configuration options, it works fine.  This
happens regardless of whether or not I have xend or any domU's running.

System information:

Tyan Thunder dual Pentium III server motherboard
Two Pentium III 1Ghz processors
1GB RAM
Debian GNU/Linux testing/unstable

simba@dino:~$ lspci
0000:00:00.0 Host bridge: Broadcom CNB20LE Host Bridge (rev 06)
0000:00:00.1 Host bridge: Broadcom CNB20LE Host Bridge (rev 06)
0000:00:01.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
0000:00:04.0 Ethernet controller: Intel Corporation 82557/8/9 [Ethernet Pro 100]
(rev 08)
0000:00:05.0 Ethernet controller: Intel Corporation 82557/8/9 [Ethernet Pro 100]
(rev 08)
0000:00:0f.0 ISA bridge: Broadcom OSB4 South Bridge (rev 50)
0000:00:0f.1 IDE interface: Broadcom OSB4 IDE Controller
0000:00:0f.2 USB Controller: Broadcom OSB4/CSB5 OHCI USB Controller (rev 04)
0000:01:02.0 SCSI storage controller: Adaptec AHA-2944UW / AIC-7884U (rev 01)
0000:01:05.0 RAID bus controller: American Megatrends Inc. MegaRAID (rev 02)

The changeset that I was using was from a few days earlier than this:

simba@dino:~/xen-unstable$ hg tip    
changeset:   7517:d25ac5cbd8d3
tag:         tip
user:        kaf24@xxxxxxxxxxxxxxxxxxxx
date:        Fri Oct 28 12:51:37 2005 +0100
summary:     Remove next_io_page field from domain structure.

I'm trying to access an ADIC FastStor DLT Medium Changer with a Quantum DLT4000
tape drive, using the Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
and the SCSI Generic driver.  Here is the dmesg output that I get for the SCSI
devices:

scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
        <Adaptec 2944 Ultra SCSI adapter>
        aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs

  Vendor: ADIC      Model: FastStor DLT      Rev: 0115
  Type:   Medium Changer                     ANSI SCSI revision: 02
 target0:0:1: Beginning Domain Validation
 target0:0:1: Ending Domain Validation
  Vendor: Quantum   Model: DLT4000           Rev: D98C
  Type:   Sequential-Access                  ANSI SCSI revision: 02
 target0:0:3: Beginning Domain Validation
 target0:0:3: Domain Validation skipping write tests
(scsi0:A:3): 10.000MB/s transfers (10.000MHz, offset 15)
 target0:0:3: Ending Domain Validation
megaraid cmm: 2.20.2.5 (Release Date: Fri Jan 21 00:01:03 EST 2005)
megaraid: 2.20.4.5 (Release Date: Thu Feb 03 12:27:22 EST 2005)
megaraid: probe new device 0x101e:0x1960:0x101e:0x0475: bus 1:slot 5:func 0
megaraid: fw version:[111U] bios version:[F320]
scsi1 : LSI Logic MegaRAID driver
scsi[1]: scanning scsi channel 0 [Phy 0] for non-raid devices
scsi[1]: scanning scsi channel 1 [virtual] for logical drives
  Vendor: MegaRAID  Model: LD 0 RAID5   52G  Rev: 111U
  Type:   Direct-Access                      ANSI SCSI revision: 02
st: Version 20050312, fixed bufsize 32768, s/g segs 256
Attached scsi tape st0 at scsi0, channel 0, id 3, lun 0
st0: try direct i/o: yes (alignment 512 B), max page reachable by HBA 1048575
SCSI device sda: 107520000 512-byte hdwr sectors (55050 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
SCSI device sda: 107520000 512-byte hdwr sectors (55050 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
 sda: sda1 sda2 sda3
Attached scsi disk sda at scsi1, channel 1, id 0, lun 0
Attached scsi generic sg0 at scsi0, channel 0, id 1, lun 0,  type 8
Attached scsi generic sg1 at scsi0, channel 0, id 3, lun 0,  type 1
Attached scsi generic sg2 at scsi1, channel 1, id 0, lun 0,  type 0
Fusion MPT base driver 3.01.20
Copyright (c) 1999-2004 LSI Logic Corporation
Fusion MPT SCSI Host driver 3.01.20
st0: Block limits 1 - 16777215 bytes.
program stinit is using a deprecated SCSI ioctl, please convert it to SG_IO

-----

In summary, if I'm running under xen0, and you run /etc/init.d/bacula-sd start,
the machine instantly reboots.

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