Running MATE x64 18.04LTS, on an HP Stream 11 inch laptop (2GB RAM) with all updates applied, causes a memory leak which consumes all available memory within about 12 hours of idling.
On initial bootup, at the MATE desktop along with a terminal open, "free" reports about 488MB of RAM used. The system is usable at this point - browsing the Web runs at an acceptable speed, music and video playback are fine, etc.
After about 8 hours having done nothing but idle at the desktop, the RAM usage is over 1.6GiB (out of the 1.8GiB available). The system begins to become unusable at this point. If you wait another four hours or so (again only idling at the desktop), all of the physical RAM has been consumed and almost half of the swap. At this point the system is basically unusable. A reboot always "fixes" the issue and returns the system to typical RAM usage levels (until the leak consumes all RAM again).
I suspect that a kernel driver may be causing the leak, since multiple memory usage checks do not show any unusual usage by applications when the leak has occurred. The attached zip file contains the output of multiple utilities after the leak has begun to occur, at around 1.5GiB of RAM consumed with no apps running, but before the system becomes so unusable that even running these CLI tools is not possible. Notably, the ps_mem Python script shows roughly the same amount of RAM usage within a margin of error both at initial boot up and after the leak has consumed most memory.
Please respond if any additional info would be of use to help isolate the problem.
? not sure if I accidentally changed to incomplete. If incomplete, please specify additional materials/data required.