booting up: blocking indefinitely on kgdb?

[Peter Teoh]

Today, both my system (2.6.32.-rc4 from linus git tree and linux-next)
bootup blocked indefinitely on:

kgdb: Registered I/O driver kgdbts.

while booting up.   The expected line:

kgdb: Unregistered I/O driver kgdbts, debugger disabled.

never comes up.

My bootup menu.lst:

title Fedora (2.6.26-rc4-next-20080530)
	root (hd1,7)
	kernel /boot/vmlinuz-2.6.26-rc4-next-20080530 ro
root=UUID=d10fe8db-e7d4-4b42-b265-0109a3f3eedf
	initrd /boot/initrd-2.6.26-rc4-next-20080530.img
title Fedora (2.6.32-rc4)
	root (hd1,7)
	kernel /boot/vmlinuz-2.6.32-rc4 ro
root=UUID=d10fe8db-e7d4-4b42-b265-0109a3f3eedf
	initrd /boot/initrd-2.6.32-rc4.img

and kgdb-related option:

CONFIG_HAVE_ARCH_KGDB=y
CONFIG_KGDB=y
CONFIG_KGDB_SERIAL_CONSOLE=y
CONFIG_KGDB_TESTS=y
CONFIG_KGDB_TESTS_ON_BOOT=y
CONFIG_KGDB_TESTS_BOOT_STRING="y"

The same 2.6.32-rc4 image have bootup previously before without any
problem.   So what could be the potential cause of this permanent
wait?

-- 
Regards,
Peter Teoh
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