apache 2.4 - apache2 mod-php cpu 100% on process

I have a VPS Debian server with Apache 2.4.10 mod-php.
Server starts normally, but after some time I get 100% cpu on one of www-data processes
and a web-server becomes unavailable.

I tried
strace on that procces and I got an infinite loop of these
lines:

poll([{fd=93,
            events=POLLIN}], 1, 3000) = 1 ([{fd=93, revents=POLLHUP}])
read(93, "",
            13160)

Then I tried
lsof ant got this:

COMMAND PID
            USER FD TYPE DEVICE SIZE/OFF NODE NAME
apache2 1134 www-data 93r FIFO 0,8 0t0
            3176528027
            pipe

What
can cause the problem? When I restart apache, after some time I have the same
behavior.

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