retry sequentially if multiprocessing do_bad_build_check detects fail… (#5578)
retry sequentially if multiprocessing do_bad_build_check detects fail… (#5578)

* retry sequentially if multiprocessing do_bad_build_check detects failures

https://github.com/google/oss-fuzz/issues/5441

The error seen in the build log is:

Whoops, the target binary crashed suddenly, before receiving any input
from the fuzzer!

suggesting that the fuzzer crashed before it got to do anything.
Debugging locally what I tend to see is that

a) in src/afl-forkserver.c afl_fsrv_start the read_s32_timed call
returns 0 and that triggers kill(fsrv->fsrv_pid, fsrv->kill_signal);
(SIGKILL)
b) read_s32_timed returns 0 because *stop_soon_p is non-zero at
restart_read:
c) *stop_soon_p becomes non-zero in handle_stop_sig of
src/afl-fuzz-init.c due to receiving SIGINT
d) that SIGINT is sent by the timeout script used in bad_build_check so
it is that "outer" timeout process which is sending SIGINT which then
triggers afl-forkserver's internal SIGKILL to kill the process

I get improved results if I retry the killed off fuzzers sequentially

* Remove unneeded semicolons to fix presubmit

Co-authored-by: Abhishek Arya <792883c4eebc3b69fa15b94e87456cf2c566c202@chromium.org>
googlefonts/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,robertswiecki/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz,googlefonts/oss-fuzz,googlefonts/oss-fuzz,google/oss-fuzz,google/oss-fuzz,skia-dev/oss-fuzz,robertswiecki/oss-fuzz,skia-dev/oss-fuzz,skia-dev/oss-fuzz,googlefonts/oss-fuzz,robertswiecki/oss-fuzz,google/oss-fuzz