Andrew

please add zram-swap and keep it longer than usual. Once something lands in compressed RAM chech whether RAM is spent by slab (kernel) or anon(userland) If you could log all...

Normal swap is ok but slow for casual usage.

Seems some back-pressure kicked in, cache was freed and system ready for future hard work. Since it is not crashing - keep monitoring forever "just in case"

Please add "memtotal" as it shrinks when kernel allocates more slabs (yeah it changes)

Add new line, not accumulated with others. On a normal info it would be easier to see one of slab types in kernel growing in /proc/slabinfo, now the only way...

You may graph the memtotal in addition to 4 you graphed, like in next graph or so, theyd be good next to eachother.

every slab type - which one is anomalously growing, then try to map that back to source files.

Thge most important part would be a minute leading to error in logread....

There is firewall offload between pppoe components. Could you try disabling that for few crach cycles?

Luci/Network/Firewall/ somewhere mid-screen uncheck offload checkbox, then tap apply below.