Hi,
I wanted to build a minimal kernel as Xen DomU, but stumbled across

[    0.029457] VFS: Disk quotas dquot_6.5.2
[    0.029559] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.029973] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[    0.030662] msgmni has been set to 243
[    0.099708] request_module: runaway loop modprobe char-major-5-1
[    0.100482] request_module: runaway loop modprobe char-major-5-1
[    0.101851] request_module: runaway loop modprobe char-major-5-1
[    0.102534] request_module: runaway loop modprobe char-major-5-1
[    0.106311] request_module: runaway loop modprobe char-major-5-1
(hangs)

after reading http://lwn.net/Articles/310472/ and comparing the output after 
msgmni of a working kernel on a other machine i found the config option change 
which breaks it:

1456c1456
< CONFIG_CRYPTO_MANAGER_TESTS=y
---
quoted text
> # CONFIG_CRYPTO_MANAGER_TESTS is not set

(without crypto test the kernel is broken)

kernel version is 2.6.35.2 (current stable git)
cmdline: root=/dev/ram0 console=hvc0

non-working config attached

Christian