SCSI errors and device hang

[Paul English]

All of a sudden some SCSI errors have started cropping up on a system that
has been stable 24/7 under light and heavy usage for more than a year. It
probably hadn't been rebooted in 90 days at least.

I'm mainly concerned about whether these errors are FreeBSD driver/os
related, or there is something wrong with the device (and Arena EX3 6 Bay IDE
Desktop unit from raidweb.com). If it can definitely be pointed at the
unit, then I can talk to raidweb tech support to resolve it hopefully. I
suspect that it is the device, because during the ensuing (purposeful)
reboots, occasionally it hangs in the SCSI controller bios partway through
detecting the drive.

Following are the SCSI errors I'm seeing. These result in the filesystem
(mounted as /raid) hanging, but otherwise the system keeps ticking:

(da0:ahc0:0:11:0): SCB 0xc - timed out
ahc0: Dumping Card State while idle, at SEQADDR 0x7
ACCUM = 0x95, SINDEX = 0xd, DINDEX = 0x8c, ARG_2 = 0x0
HCNT = 0x0
SCSISEQ = 0x12, SBLKCTL = 0x2
 DFCNTRL = 0x0, DFSTATUS = 0x29
LASTPHASE = 0x1, SCSISIGI = 0x0, SXFRCTL0 = 0x80
SSTAT0 = 0x5, SSTAT1 = 0xa
STACK == 0x3, 0xec, 0x147, 0x0
SCB count = 20
Kernel NEXTQSCB = 18
Card NEXTQSCB = 18
QINFIFO entries:
Waiting Queue entries:
Disconnected Queue entries: 2:12
QOUTFIFO entries:
Sequencer Free SCB List: 0 1 3 4 5 6 7 8 9 10 11 12 13 14 15
Pending list: 12
Kernel Free SCB list: 13 1 16 8 2 17 3 4 14 9 6 5 7 19 0 15 11 10
sg[0] - Addr 0xa85b000 : Length 4096
sg[1] - Addr 0x7f3c000 : Length 4096
sg[2] - Addr 0x69fd000 : Length 4096
sg[3] - Addr 0x5a1e000 : Length 4096
sg[4] - Addr 0xadff000 : Length 4096
sg[5] - Addr 0xa700000 : Length 4096
sg[6] - Addr 0x168a1000 : Length 4096
sg[7] - Addr 0xaf42000 : Length 4096
sg[8] - Addr 0xaca3000 : Length 4096
sg[9] - Addr 0x9e04000 : Length 4096
sg[10] - Addr 0x8985000 : Length 4096
sg[11] - Addr 0x97c6000 : Length 4096
sg[12] - Addr 0x8447000 : Length 4096
sg[13] - Addr 0xaa48000 : Length 4096
sg[14] - Addr 0xa349000 : Length 4096
sg[15] - Addr 0xa4aa000 : Length 4096
(da0:ahc0:0:11:0): Queuing a BDR SCB
(da0:ahc0:0:11:0): Bus Device Reset Message Sent
(da0:ahc0:0:11:0): no longer in timeout, status = 34b
ahc0: Bus Device Reset on A:11. 1 SCBs aborted
(da0:ahc0:0:11:0): SCB 0x12 - timed out
ahc0: Dumping Card State while idle, at SEQADDR 0x7
ACCUM = 0x97, SINDEX = 0x64, DINDEX = 0x65, ARG_2 = 0x4
HCNT = 0x0
SCSISEQ = 0x12, SBLKCTL = 0x2
 DFCNTRL = 0x0, DFSTATUS = 0x2d
LASTPHASE = 0x1, SCSISIGI = 0x0, SXFRCTL0 = 0x80
SSTAT0 = 0x5, SSTAT1 = 0xa
STACK == 0x3, 0x188, 0x0, 0xcb
SCB count = 20
Kernel NEXTQSCB = 12
Card NEXTQSCB = 12
QINFIFO entries:
Waiting Queue entries:
Disconnected Queue entries: 2:18
QOUTFIFO entries:
Sequencer Free SCB List: 0 1 3 4 5 6 7 8 9 10 11 12 13 14 15
Pending list: 18
Kernel Free SCB list: 13 1 16 8 2 17 3 4 14 9 6 5 7 19 0 15 11 10
sg[0] - Addr 0xa85b000 : Length 4096
sg[1] - Addr 0x7f3c000 : Length 4096
sg[2] - Addr 0x69fd000 : Length 4096
sg[3] - Addr 0x5a1e000 : Length 4096
sg[4] - Addr 0xadff000 : Length 4096
sg[5] - Addr 0xa700000 : Length 4096
sg[6] - Addr 0x168a1000 : Length 4096
sg[7] - Addr 0xaf42000 : Length 4096
sg[8] - Addr 0xaca3000 : Length 4096
sg[9] - Addr 0x9e04000 : Length 4096
sg[10] - Addr 0x8985000 : Length 4096
sg[11] - Addr 0x97c6000 : Length 4096
sg[12] - Addr 0x8447000 : Length 4096
sg[13] - Addr 0xaa48000 : Length 4096
sg[14] - Addr 0xa349000 : Length 4096
sg[15] - Addr 0xa4aa000 : Length 4096
(da0:ahc0:0:11:0): Queuing a BDR SCB
(da0:ahc0:0:11:0): Bus Device Reset Message Sent
(da0:ahc0:0:11:0): no longer in timeout, status = 34b
ahc0: Bus Device Reset on A:11. 1 SCBs aborted