readahead - access beyond end of device; then hang (2.6.17-git14)

[Duncan Sands <duncan.sands@math.u-psud.fr>]

First, X-windows became sluggish, but without any
obvious reason.  Then I noticed that the main
network interface wasn't configured, and ran dhclient
to set it up.  At that point (hda2 mounted on /),
I got the following messages and the machine hung.
Ideas anyone?

Duncan.

[28029.821328] attempt to access beyond end of device
[28029.835721] hda2: rw=0, want=723745656, limit=28772415
[28029.851370] attempt to access beyond end of device
[28029.865765] hda2: rw=0, want=3415755704, limit=28772415
[28029.881697] attempt to access beyond end of device
[28029.896078] hda2: rw=0, want=1402680224, limit=28772415
[28029.912001] attempt to access beyond end of device
[28029.926393] hda2: rw=0, want=723745656, limit=28772415
[28029.942202] attempt to access beyond end of device
[28029.956597] hda2: rw=0, want=2073054136, limit=28772415
[28029.972741] attempt to access beyond end of device
[28029.987115] hda2: rw=0, want=2603852672, limit=28772415
[28030.003021] attempt to access beyond end of device
[28030.017399] hda2: rw=0, want=595292248, limit=28772415
[28030.033045] attempt to access beyond end of device
[28030.047425] hda2: rw=0, want=273396528, limit=28772415
[28030.063058] attempt to access beyond end of device
[28030.077450] hda2: rw=0, want=1404250920, limit=28772415
[28030.093346] attempt to access beyond end of device
[28030.107735] hda2: rw=0, want=723745656, limit=28772415
[28030.123368] attempt to access beyond end of device
[28030.137762] hda2: rw=0, want=2474658744, limit=28772415
[28030.153668] attempt to access beyond end of device
[28030.168046] hda2: rw=0, want=1884494720, limit=28772415
[28030.183953] attempt to access beyond end of device
[28030.198333] hda2: rw=0, want=3005948800, limit=28772415
[28030.214241] attempt to access beyond end of device
[28030.228617] hda2: rw=0, want=461084752, limit=28772415
[28030.244264] attempt to access beyond end of device
[28030.258644] hda2: rw=0, want=1402680160, limit=28772415
[28030.274537] attempt to access beyond end of device
[28030.288931] hda2: rw=0, want=723745656, limit=28772415
[28030.304578] attempt to access beyond end of device
[28030.318956] hda2: rw=0, want=1266699192, limit=28772415
[28030.334642] attempt to access beyond end of device
[28030.349031] hda2: rw=0, want=2603821960, limit=28772415
[28030.364720] attempt to access beyond end of device
[28030.379108] hda2: rw=0, want=595292248, limit=28772415
[28030.394539] attempt to access beyond end of device
[28030.408926] hda2: rw=0, want=810267440, limit=28772415
[28030.424357] attempt to access beyond end of device
[28030.438744] hda2: rw=0, want=723745656, limit=28772415
[28030.455005] attempt to access beyond end of device
[28030.469393] hda2: rw=0, want=723745656, limit=28772415
[28030.484822] Reducing readahead size to 32K
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