Unable to communicate with fork server

[Marsman1996]

Hi

I'm trying to fuzz tic in ncurse-6.0 with your 7 strategies, but after about 1 hour or 2 they all stopped with error message:

[-] PROGRAM ABORT : Unable to communicate with fork server
         Location : run_target(), afl-fuzz.c:2168

My test enviroment is Ubuntu 16.04-64bit, 40 cores Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz, 64GB ram.

I compile the ncurse with command:

$ CPPFLAGS+=-P ../code/configure --prefix=/opt/disk/fuzz/test/tic/bin_normal
$ make && make install

And I compile the afl-bc/ct/ma... with command:

cd qemu_mode
./build_qemu_support.sh
cd ..
make

The fuzz command is like

$ /opt/disk/fuzz/afl-ct/afl-fuzz -Q -i in/ -o out_ct -l out_ct -m none -- ./bin_normal/bin/tic @@ -o /dev/null

Thanks for any reply.