Hi, this bug is still there in kernel 4.9.30 : $ uname -a Linux irancy.iut2.upmf-grenoble.fr 4.9.0-3-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.30-1 (2017-06-04) x86_64 GNU/Linux $ dmesg [...] [187203.776023] NOHZ: local_softirq_pending 80 -- Laurent.