"Unable to execute" after running HHVM some time
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- C++
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Description
I had a weird issue just yet with hhvm. I couldn't execute external commands anymore
Using the `mail()` function I got: `Unable to send mail. Unable to execute sendmail -t -i`
With `exec('ls')` I got the same "unable to execute" error. Restarting hhvm solved the problem. The only resource I could find online was this question: https://stackoverflow.com/questions/23266805/problems-with-hhvm-and-shell-exec
The HHVM process was running close to two weeks.
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