So I'm thinking this problem is caused by php-fpm.
This is not exactly php list and not really related to nginx, but you should start by at least telling your php version, there have been a bunch of bugs fixed regarding fpm and cpu hogging (also in php core itself) in past.
It can always be a poor php code (<? while(true) { } ?>) though but without the fpm backtrace it's hard to tell.
rr
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