Varnish memory pool overflow causes fault handling

The online varnish has been running steadily before, and this time the website suddenly responds particularly slowly. View the log as follows

The system information is as follows:

The memory usage is very low but the load is particularly high, because the memory mapping limit is the reason why you are looking for related documents.

You can pass statistics

Cat/proc/pid/maps | Wc-l

View the number of mappings now

The default system mapping is

Cat/proc/sys/vm/max_map_count

Can be processed by height/etc/sysctl.conf vm.max_map_count

Reference Links:

Http://varnish-misc.varnish-cache.narkive.com/yimPbWHd/varnish-crash-error-in-munmap-cannot-allocate-memory

Varnish memory pool overflow causes fault handling