shell_exec of timelimit command hangs forever.
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php5 incompatibility
webserver
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Description
shell_exec, exec, proc_open etc all hang when running through hhvm, nginx->fastcgi->hhvm latest tip.
The smallest reproducible case for me is below, remove tlmelimit -q and it'll work -- php5-fpm handles this fine. Running strace -f shows the subcommand does appear to be running properly.
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