Just tried 2.6.25-rc3 and got the error below. Boot continued normally.
Error was not present in rc2.

System is x86_64, dual core Pentium D, Debian unstable.

Cheers,
FJP

P.S. Yes, I do have VirtualBox working under 2.6.25 now ;-)


[...]
checking if image is initramfs...<7>Switched to high resolution mode on CPU 1
Switched to high resolution mode on CPU 0
 it is
Freeing initrd memory: 3765k freed
sysctl table check failed: /kernel/vsyscall64  No proc_handler
Pid: 1, comm: swapper Not tainted 2.6.25-rc3 #60

Call Trace:
 [<ffffffff8024a61f>] set_fail+0x48/0x53
 [<ffffffff8024ab15>] sysctl_check_table+0x4eb/0x53e
 [<ffffffff8024ab2f>] sysctl_check_table+0x505/0x53e
 [<ffffffff8023a96e>] __register_sysctl_paths+0xf1/0x146
 [<ffffffff8023a9ec>] register_sysctl_paths+0x29/0x2b
 [<ffffffff8023aa01>] register_sysctl_table+0x13/0x15
 [<ffffffff8059bb18>] vsyscall_init+0x49/0x6e
 [<ffffffff8059571e>] kernel_init+0x162/0x2d2
 [<ffffffff8020ce18>] child_rip+0xa/0x12
 [<ffffffff803357dc>] ? acpi_ds_init_one_object+0x0/0x88
 [<ffffffff805955bc>] ? kernel_init+0x0/0x2d2
 [<ffffffff8020ce0e>] ? child_rip+0x0/0x12

audit: initializing netlink socket (disabled)
[...]