Hi, this bug is still there in kernel 4.11.6 : $ uname -a Linux irancy.iut2.upmf-grenoble.fr 4.11.0-1-rt-amd64 #1 SMP PREEMPT RT Debian 4.11.6-1 (2017-06-19) x86_64 GNU/Linux $ dmesg [...] [690935.587688] NOHZ: local_softirq_pending 80 When this error occurred the system was accessing a btrfs filesystem on a USB disk. Might the problem be in btrfs? -- Laurent.