Hammer errors.

[Dan Cross]

I woke up to IO errors on my Dragonfly machine. dmesg shows this
representative sample:

xop_strategy_read: error 00000001 loff=0000000000000000
xop_strategy_read: error 00000001 loff=0000000000000000
xop_strategy_read: error 00000001 loff=0000000000000000
chain 00000002d557e00d.03 (data) meth=30 CHECK FAIL (flags=00140002,
bref/data 9cbebec7cf70e05e/82bd4a4d5e615881)
   Resides in root index - CRITICAL!!!
   In pfs ROOT on device serno/S59ANMFNB34055E-1.s1d
xop_strategy_read: error 00000001 loff=0000000000000000
chain 00000002d55f800e.03 (data) meth=30 CHECK FAIL (flags=00140002,
bref/data 1ad0e6d4985a5a26/49c183c5c504b3fd)
   Resides in root index - CRITICAL!!!
   In pfs ROOT on device serno/S59ANMFNB34055E-1.s1d
xop_strategy_read: error 00000001 loff=0000000000000000
chain 00000002d567400e.03 (data) meth=30 CHECK FAIL (flags=00140002,
bref/data c487220646639bc2/125e4d1e903b1cd6)
   Resides in root index - CRITICAL!!!
   In pfs ROOT on device serno/S59ANMFNB34055E-1.s1d
xop_strategy_read: error 00000001 loff=0000000000000000
chain 00000002d5730010.03 (data) meth=30 CHECK FAIL (flags=00140002,
bref/data d50e1a1014a3c3be/04022d5bee660bb4)
   Resides in root index - CRITICAL!!!
   In pfs ROOT on device serno/S59ANMFNB34055E-1.s1d
xop_strategy_read: error 00000001 loff=0000000000010000
chain 00000002d5730010.03 (data) meth=30 CHECK FAIL (flags=00140002,
bref/data d50e1a1014a3c3be/04022d5bee660bb4)
   Resides in root index - CRITICAL!!!
   In pfs ROOT on device serno/S59ANMFNB34055E-1.s1d
xop_strategy_read: error 00000001 loff=0000000000010000

Which looks really pretty bad. There don't appear to be any errors from the
underlying device, however, and rebooting seems to have cleared it up
(which also seems kind of bad, in the sense that nondeterminism is never
fun).

I suppose the question is: how concerned should I be?

        - Dan C.
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