It turned out to be a bad memory module at U0702.
Thanks to the following people who took time help me out.
From: Brett Lymn <email@example.com>
From: Thomas Anders <firstname.lastname@example.org>
From: Nick Hindley <Nick.Hindley@itsd.lbhf.gov.uk>
-- orignial question --
On Wed, 27 Jan 1999, Tony C. Wu wrote:
> Hi there,
> One of our servers went down over the weekend with the following messages
> popped up on the console. What could be the problem ? Thanks in advance
> for your helps.
> panic[cpu0]/thread=4003be80: Async data error at tl1
> reboot after panic: SBus0 UE Primary Error DMA read: AFSR
> 0x4000fbe.00000000 AFAR 0x00000000.bff40000 MemMod U0702 Id.
> Tony Wu
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