It happens sometimes after suspend of my laptop. System time is wrong, currently in my test VM in the future. strace -p <pid> -f shows repeately only: select(8, [5 6 7], NULL, NULL, {tv_sec=0, tv_usec=0}) = 0 (Timeout) ltrace loops over: [pid 782] clock_gettime(0, 0x7ffe465a68d0, 0, 0x7fca3ee4e3a3) = 0 [pid 782] clock_gettime(0, 0x7ffe465a68d0, 0x5ee9edf6, 0x5ee9edf6) = 0 [pid 782] __fdelt_chk(5, 0, 0x55715675bed0, 0) = 0 [pid 782] __fdelt_chk(6, 32, 0x55715675bed0, 5) = 0 [pid 782] __fdelt_chk(7, 64, 0x55715675bed0, 6) = 0 [pid 782] select(8, 0x7ffe465a69f0, 0, 0) = 0 [pid 782] __errno_location() = 0x7fca3ed4c6c0 systemctl start chronyd results in this process list: root 11326 0.0 4.7 19412 7844 pts/0 S+ 11:50 0:00 systemctl start chronyd root 11328 0.0 0.7 3908 1152 ? Ss 11:50 0:00 /usr/sbin/chronyd root 11329 0.0 0.0 0 0 ? Zs 11:50 0:00 [chronyd] <defunct> root 11330 99.8 1.1 4120 1956 ? R 11:50 0:08 /usr/sbin/chronyd root 11332 0.0 0.3 6088 612 pts/2 S+ 11:50 0:00 grep --color=auto chrony