Latest working kernel version: 2.6.22
Earliest failing kernel version: 2.6.24
Distribution: Gentoo
Hardware Environment: Compaq Alphaserver ES40
Software Environment: kernel/iptables
Problem Description:

Iptables conntrack modules can't be loaded. Error message:

Jun 16 15:37:31 monolith module nf_conntrack: Relocation (type 17) overflow vs per_cpu__nf_conntrack_stat
Jun 16 15:37:31 monolith modprobe: WARNING: Error inserting nf_conntrack (/lib/modules/2.6.24.7/kernel/net/netfilter/nf_conntrack.ko): Invalid module format
Jun 16 15:37:31 monolith xt_state: Unknown symbol nf_conntrack_untracked
Jun 16 15:37:31 monolith xt_state: Unknown symbol nf_ct_l3proto_module_put
Jun 16 15:37:31 monolith xt_state: Unknown symbol nf_ct_l3proto_try_module_get
Jun 16 15:37:31 monolith modprobe: FATAL: Error inserting xt_state (/lib/modules/2.6.24.7/kernel/net/netfilter/xt_state.ko): Unknown symbol in module, or unknown parameter (see dmesg)

Dmesg output doesn't have any additional info.

Since Conntracking doesn't work, iptables is pretty much unusable.

I also tried (re)starting configuration from scratch, to no avail.