I am having stange freezes which are hard to pin down. A 1.5L/i386 kernel of
Wed Nov 29 16:52:19 GMT 2000 seems fine though I may just have not used the
box enough to exhibit the freeze. With a kernel of yesterday and this
morning, the box locks up solid with no error messages.

The computer has:

ahc0: interrupting at irq 14
ex0: interrupting at irq 14

ahc0: aic7860 ahc0: dmamem for shared data at busaddr 8000 virt ca6f7000 nseg 1 size 768
ahc0: dmamem for hardware SCB structures at busaddr 9000 virt ca6f8000 nseg 1 size 16320
ahc0: dmamem for sense buffers at busaddr d000 virt ca6fc000 nseg 1 size 8160
ahc0: dmamem for SG space at busaddr f000 virt ca6fe000 nseg 1 size 4096
Single Channel A, SCSI Id=7, 3/255 SCBs
ahc0: hardware scb 64 bytes; kernel scb 40 bytes; ahc_dma 8 bytes
DISCENABLE == 0xffff00ff
ULTRAENB == 0x85
scsibus0 at ahc0 channel 0: 8 targets, 8 luns per target
ahc0: target 0 synchronous at 20.0MHz, offset = 0xf
ahc0: target 0 using tagged queuing
sd0 at scsibus0 target 0 lun 0: <IBM, DNES-318350, SA30> SCSI3 0/direct fixed
ahc0: target 2 synchronous at 20.0MHz, offset = 0xf
ahc0: target 2 using tagged queuing
sd1 at scsibus0 target 2 lun 0: <QUANTUM, XP34550S, LYK8> SCSI2 0/direct fixed

Once, just before it happened many sd1(ahc0:2:0): queue full messages appeared.
Building a kernel with AHC_DEBUG greatly increased the time between freezes
possibly because of having to write all the

sd0(ahc0:0:0): Handled Residual of 0 bytes
sd1(ahc0:2:0): Handled Residual of 0 bytes

messages to /var/log/messages on sd0. But finally a hang when the following
happened:

sd0(ahc0:0:0): SCB 1d - timed out in Data-in phase, SEQADDR == 0x110
SCSIRATE == 0xf
scb:0xc074a488 tag 1d control:0x6a tcl:0x0 cmdlen:10 cmdpointer:0x9760
        datlen:4096 data:0x19b5000 segs:0x2 segp:0xff70
        sg_addr:19b5000 sg_len:4096
        cdb:28 0 2 9 9b d0 0 0 10 0 0 0
sd0(ahc0:0:0): BDR message in message buffer
): queue full
sd1(ahc0:2:0): Handled Residual of 8192 bytes
sd1(ahc0:2:0): queue full
sd1(ahc0:2:0): Handled Residual of 5120 bytes
sd1(ahc0:2:0): queue full
sd1(ahc0:2:0): Handled Residual of 2048 bytes
sd1(ahc0:2:0): queue full
sd1(ahc0:2:0): Handled Residual of 2048 bytes
sd1(ahc0:2:0): queue full
sd1(ahc0:2:0): Handled Residual of 8192 bytes
sd1(ahc0:2:0): queue full

etc. - no recovery.

Any ideas?

Cheers,

Patrick