Even swap freezes: #> dmesg | tail [424953] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already in queue awaiting acceptance (68 occurrences) [425014] sonewconn: pcb 0xfffff80055cc8ae0: Listen queue overflow: 193 already in queue awaiting acceptance (63 occurrences) [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 503557, size: 4096 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 288650, size: 4096 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 288651, size: 4096 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 288664, size: 12288 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 288652, size: 49152 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 366160, size: 8192 [425020] swap_pager: indefinite wait buffer: bufobj: 0, blkno: 288668, size: 8192 The clock stops entirely until ntpd is killed: date Mon Jul 30 12:33:31 CEST 2018 ntpq -pn remote refid st t when poll reach delay offset jitter ============================================================================== +XXX.XXX.X.X XXX.XXX.X.XXX 2 u 29 64 377 0.319 7.184 0.058 *XXX.XX.XX.XXX .GPS. 1 u 31 64 377 2.666 7.546 0.061 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 date Mon Jul 30 12:33:31 CEST 2018 service ntpd stop Stopping ntpd. Waiting for PIDS: 13879, 13879. ntpdate XXXX.XX.XX.XXX 30 Jul 12:36:16 ntpdate[48763]: step time server XXX.XX.XX.XXX offset 136.779808 sec date Mon Jul 30 12:36:20 CEST 2018 service ntpd start Starting ntpd. ntpq -pn remote refid st t when poll reach delay offset jitter ============================================================================== +XXX.XXX.X.X XXX.XXX.X.XXX 2 u 64 64 377 0.336 1.685 1.614 *XXX.XX.XX.XXX .GPS. 1 u 3 64 377 2.708 3.240 0.928