Apparent MPT ata pass-through bug SAS1068 and SAS1068E - WAS SMART causes disks to go offline on an LSI SAS1068 controller - Dell SAS 5/iR

[Tim Small <tim@seoss.co.uk>]

Hello,

On a Dell PowerEdge 1950 Debian 5.0 amd64 system (2.6.26-2-amd64), which 
includes one of these:

01:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E 
PCI-Express Fusion-MPT SAS (rev 08)
        Subsystem: Dell SAS 6/iR Integrated RAID Controller
        Flags: bus master, fast devsel, latency 0, IRQ 1270
        I/O ports at ec00 [size=256]
        Memory at fc5fc000 (64-bit, non-prefetchable) [size=16K]
        Memory at fc5e0000 (64-bit, non-prefetchable) [size=64K]
        Expansion ROM at fc600000 [disabled] [size=1M]
        Capabilities: [50] Power Management version 2
        Capabilities: [68] Express Endpoint, MSI 00
        Capabilities: [98] Message Signalled Interrupts: Mask- 64bit+ 
Queue=0/0 Enable+
        Capabilities: [b0] MSI-X: Enable- Mask- TabSize=1
        Capabilities: [100] Advanced Error Reporting <?>
        Kernel driver in use: mptsas
        Kernel modules: mptsas

filename:       
/lib/modules/2.6.26-2-amd64/kernel/drivers/message/fusion/mptsas.ko
version:        3.04.06
license:        GPL
description:    Fusion MPT SAS Host driver
author:         LSI Corporation

.. and a couple of WesternDigitial SATA drives,  I ran the following 
command:

while true ; do smartctl -a /dev/sg0 > /dev/null ; done

After approx 45 minutes this happened:

kernel: [5060492.926757] 
mptctldrivers/message/fusion/mptctl.c::mptctl_ioctl() @602 - Controller 
disabled.

... and all the attached block devices were no-longer available.  The 
machine also runs mpt-status.

Regards,

Tim.

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