Ingo Molnar wrote:
> randconfig testing found the following build failure on latest -git:
>
>  net/built-in.o: In function `ip_queue_init':
>  ip_queue.c:(.init.text+0x322c): undefined reference to `net_ipv4_ctl_path'
>
> config attached.

Thanks, the reason is CONFIG_SYSCTL=n. I've queued this patch
(might not apply to Linus' tree due to local changes) to fix
the build error and a runtime error with CONFIG_PROC_FS=n.