kernel: pid … (kwin_x11), … was killed: out of swap space

…
Feb  3 05:51:55 momh167-gjp4-8570p kernel: swap_pager_getswapspace(32): failed
Feb  3 05:51:56 momh167-gjp4-8570p syslogd: last message repeated 2 times
Feb  3 05:51:56 momh167-gjp4-8570p kernel: swap_pager_getswapspace(20): failed
Feb  3 05:51:56 momh167-gjp4-8570p kernel: swap_pager_getswapspace(32): failed
Feb  3 05:51:56 momh167-gjp4-8570p kernel: swap_pager_getswapspace(28): failed
Feb  3 05:51:57 momh167-gjp4-8570p kernel: swap_pager_getswapspace(32): failed
Feb  3 05:51:57 momh167-gjp4-8570p syslogd: last message repeated 3 times
Feb  3 05:52:03 momh167-gjp4-8570p kernel: pid 65230 (waterfox), jid 0, uid 1002, was killed: out of swap space
Feb  3 05:52:04 momh167-gjp4-8570p kernel: pid 2194 (kwin_x11), jid 0, uid 1002, was killed: out of swap space
Feb  3 05:52:05 momh167-gjp4-8570p kernel: pid 2200 (plasmashell), jid 0, uid 1002, was killed: out of swap space
Feb  3 05:52:06 momh167-gjp4-8570p kernel: pid 69545 (spectacle), jid 0, uid 1002, was killed: out of swap space
Feb  3 05:54:05 momh167-gjp4-8570p kernel: pid 69857 (ck-remove-directory), jid 0, uid 1002: exited on signal 5
Feb  3 05:54:08 momh167-gjp4-8570p devd[1575]: notify_clients: send() failed; dropping unresponsive client
Feb  3 05:54:12 momh167-gjp4-8570p kernel: pid 2233 (python3.6), jid 0, uid 1002: exited on signal 5 (core dumped)
Feb  3 05:54:25 momh167-gjp4-8570p pulseaudio[2266]: [(null)] pid.c: Failed to open PID file '/var/run/user/1002/pulse/pid': No such file or directory
Feb  3 05:54:25 momh167-gjp4-8570p syslogd: last message repeated 1 times
Feb  3 05:58:54 momh167-gjp4-8570p shutdown[69907]: reboot by root: