strange hangs with kernel 2.4.12 (and 13)

[Michael Reinelt <reinelt@eunet.at>]

Hi there,

I've got some strange problems here, since 2.4.12 (2.4.10 was ok, I
never tried .11)

The System boots fine, I can login on a text console, but when I log out
again, the system partly gets unusable. The load rises, and the text
console where I logout hangs. 

I've got seveal processes hanging in "D" state, especially devfsd. I
think something with devfs and/or devfsd is broken here. If I kill
devfsd before, the problem does not arise (but I need devfsd :-)

Now, It gets even more strange: The problem does only exist if I
deactivate ACPI! I tried with a ACPI enabled kernel with the command
line "acpi=off", I tried on a machine which is too old for ACPI, and I
even compiled a kernel without ACPI at all. Everywhere the same problem.
When I boot with activated ACPI, there's no problem.

I don't understand what's happening here. I tried to debug a bit, but
couldn't find something sense- or useful. 


Any hints? If someone could tell me what I should try or which debug
info could be useful, please let me know!

TIA, Michael

-- 
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Michael Reinelt                                   Fax: +43 316  692343
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A-8045 Graz, Austria                          e-mail: reinelt@eunet.at