mpt errors and lockup

[Andrew D. Clark]

Hi,

I'm running FreeBSD 4.11 on x86 (a Dell PE1750) and having some fun 
with my mpt device.  Under read load, the bus will spit out many error 
messages, sometimes recover, sometimes lock up the system, requiring a 
power cycle.  Kernel log messages look like so:

May  9 00:54:35 ftp /kernel: mpt1: time out on request index = 0xb9 
sequence = 0x00d11d59
May  9 00:54:39 ftp /kernel: mpt1: Status 00000001; Mask 00000001; 
Doorbell 24000000
May  9 00:54:39 ftp /kernel: request state On Chip
May  9 00:54:39 ftp /kernel: SCSI IO Request @ 0xc0455010
May  9 00:54:39 ftp /kernel: Chain Offset  0x00
May  9 00:54:39 ftp /kernel: MsgFlags      0x00
May  9 00:54:39 ftp /kernel: MsgContext    0x000000b9
May  9 00:54:39 ftp /kernel: Bus:                0
May  9 00:54:39 ftp /kernel: TargetID            0
May  9 00:54:39 ftp /kernel: SenseBufferLength   32
May  9 00:54:39 ftp /kernel: LUN:              0x0
May  9 00:54:39 ftp /kernel: Control           0x02000000  READ 
SIMPLEQ
May  9 00:54:39 ftp /kernel: DataLength 0x00000200
May  9 00:54:39 ftp /kernel: SenseBufAddr       0x000683e0
May  9 00:54:39 ftp /kernel: CDB[0:10]  5f 00 01 00 00 00 00 02 00 00
May  9 00:54:39 ftp /kernel: SE32 0xe2e53230: Addr=0xeb10c00 
FlagsLength=0xd1000200
May  9 00:54:39 ftp /kernel: LAST_ELEMENT END_OF_BUFFER END_OF_LIST

repeat ad rebootum...

--
Andrew Clark
Campus Network Programmer
Office of Information Technology
University of California, Santa Barbara
andrew.clark at ucsb.edu (805) 893-5311