FM / parameters

/sys/module/rcupdate/parameters

Name	Size	Mode	Actions
rcu_cpu_stall_ftrace_dump	4096	0644	edit dl rm
rcu_cpu_stall_suppress	4096	0644	edit dl rm
rcu_cpu_stall_timeout	4096	0644	edit dl rm
rcu_task_stall_timeout	4096	0644	edit dl rm

Edit: /sys/module/rcupdate/parameters/rcu_cpu_stall_timeout (4096B)