I have tried the 4.3 kernel. It definitely has the same bug. See this
output from top:
top - 07:57:36 up 1 day, 18:26, 3 users, load average: 1.00, 1.01, 1.05
Tasks: 457 total, 2 running, 455 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2.1 us, 0.0 sy, 0.0 ni, 97.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 65937648 total, 36575292 used, 29362356 free, 24208 buffers
KiB Swap: 67071996 total, 16111052 used, 50960944 free. 553420 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5515 theosib 20 0 40.620g 0.025t 27352 R 100.0 41.2 583:03.59
common_shell_ex
There is only one process using much memory, but the OS started using
swap after only about half the physical RAM was occupied.
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https://bugs.launchpad.net/bugs/1513673
Title:
15.10 swapping heavily after process exceeds 50% physical RAM
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