Kernel 2.6.22.6 hangs in synchronize_rcu

I'm porting kernel 2.6.22.6 on custom embedded system (ARM1136). During network subsystem initialization, kernel hangs in function synchronize_rcu invoked by synchronize_net. In particular wait_for_completion(); never returns and wakeme_after_rcu is never hit. Anybody can give me any advice

Kernel 2.6.22.6 hangs in synchronize_rcu

I'm porting kernel 2.6.22.6 on custom embedded system (ARM1136). During network subsystem initialization, kernel hangs in function synchronize_rcu invoked by synchronize_net. In particular wait_for_completion(rcu.completion); never returns and wakeme_after_rcu is never hit. Anybody can give me