On Wed, 09 May 2007 01:23:22 PDT, Andrew Morton said:
quoted text
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm2/

So I have a canned grub config for booting with netconsole, initcall_debug, and
all that fun stuff.  Tried it on 21-mm2, and it wedged up hard here:

[   66.842587] TCP: Hash tables configured (established 131072 bind 65536)
[   66.842591] TCP reno registered
[   66.845424] initcall 0xffffffff806ff7c6: inet_init+0x0/0x34d() returned 0.
[   66.845437] initcall 0xffffffff806ff7c6 ran for 14 msecs: inet_init+0x0/0x34d()
[   66.845443] Calling initcall 0xffffffff806e28eb: populate_rootfs+0x0/0xea()
[   66.845566] checking if image is initramfs... it is
[   66.978816] Freeing initrd memory: 1824k freed
[   66.979130] initcall 0xffffffff806e28eb: populate_rootfs+0x0/0xea() returned 0.
[   66.979141] initcall 0xffffffff806e28eb ran for 127 msecs: populate_rootfs+0x0/0xea()
[   66.979146] Calling initcall 0xffffffff8020cf78: time_init_device+0x0/0x22()

Total brick, no sysrq.  Had to power cycle.  Oddly enough, it boots OK
with the same grub line, but minus 'earlyprintk=vga initcall_debug':

[   26.768561] TCP: Hash tables configured (established 131072 bind 65536)
[   26.768566] TCP reno registered
[   26.771502] checking if image is initramfs... it is
[   26.904772] Freeing initrd memory: 1824k freed
[   26.910854] audit: initializing netlink socket (disabled)
[   26.910874] audit(1178725351.514:1): initialized
[   26.911253] VFS: Disk quotas dquot_6.5.1

(My guess is that initcall_debug is trashing some timing constraint that
time_init_device is relying on?)