Juergen Heberling wrote:
Hi all

Please suggest some way of diagnosing this problem:

System freezes after being up in production and apparently stable for several weeks, no dump, no error message, nothing on the console - so I suspect hardware.
> ...
Here is my dmesg, long lines were wrapped:
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  6
 cpu3 (AP): APIC ID:  7
ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x2400-0x24ff,0x2000-0x20ff
        mem 0xdd200000-0xdd201fff irq 32 at device 2.0 on pci3
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x2c00-0x2cff,0x2800-0x28ff
        mem 0xdd202000-0xdd203fff irq 33 at device 2.1 on pci3
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs

I've had freezes as you describe on two different servers with ahd and SMP. The solution was to turn SMP off, unfortunately :(

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