what does this CIA machine check mean? (fwd)

[Tom Holroyd <tomh nibh go jp>]

This is on an AlphaPC164LX running 2.2.0 with the semaphore patch --
it happened while I was doing IO to a vfat mounted floppy.

CIA machine check: processor detected hard error
vector=0x670 la_ptr=0xfffffc00002085a0 pc=0xfffffc0000420db0
+       0 00000000000001b8 00000160000000d8
+      10 0000000000000098 79da33b3d25f85ad
+      20 0000000000000000 fffffc0000310898 entUna
+      30 0000000000208000 0000000000000000
+      40 00000200000291e0 0000000000000004
+      50 fffffc0000310580 1f1e161515020100 entIF
+      60 fffffc0000310ad8 fffffc0000420db0 entSys pc
+      70 fffffc00003103c0 fffffc0000310500 entInt entArith
+      80 0000cb7500000100 0000008740000000
+      90 fffffc000043bf60 0000009806700001
+      a0 0000000000000000 fffffc00003b3f00 rpciod
+      b0 fffffc0002c87e18 0000000000300000
+      c0 fffffc0000310440 fffffc00004862a8 entMM _ctype+0x8100
+      d0 0000000007730360 fffffc0000420db0 pc
+      e0 0000000000000000 0000000000000000
+      f0 0000000000200000 0000000000000000
+     100 0000004164020000 0000000000000000
+     110 0000000000000000 0000000120108000
+     120 0000000000011850 ffffff0000205a8f 
+     130 0000000000000000 ffffff80058d6fff
+     140 ffffffaec336aeff 0000000000006bc4
+     150 fffffff005ffffff ffffff00077956cf
+     160 0000000000206b00 00000000002000ff
+     170 0000000000000000 000000000000001a
+     180 0000000000000f97 00000000000000f3
+     190 0000000040008300 0000000010100000
+     1a0 0000000003010006 0000000040008800
+     1b0 0000000000000021 3030303224343066

According to System.map, the pc is inside do_csum_partial_copy_from_user,
and I've marked things that are obviously inside the kernel.

Is this something strange with my hardware, or did the kernel do something
it shouldn't have?

Dr. Tom Holroyd
I would dance and be merry,
Life would be a ding-a-derry,
If I only had a brain.
	-- The Scarecrow