Date: Sun, 03 Jun 2018 20:13:24 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 228728] sh does not reap killed background processes until terminal activity, creating zombies Message-ID: <bug-228728-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228728 Bug ID: 228728 Summary: sh does not reap killed background processes until terminal activity, creating zombies Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: mqudsi@neosmart.net The default `sh` shell does not reap backgrounded processes if sitting idle, and killed backgrounded processes are not reaped until a new command is executed or enter is pressed at the tty. For example, ``` $ cat <CTRL-Z> [1] + Suspended cat $ ``` Now in another terminal or in an SSH session: ``` $ killall -9 cat ``` The PID associated with cat is turned into a zombie as the shell does not reap the killed instance. The only way to trigger reaping would be to attach to the tty session where the process was initially backgrounded and hit <ENTER>: ``` $ cat # resuming from first segment above $ <ENTER> [1] Killed cat $ ``` Solution: `waitpid(2)` should be used to asynchronously detect the exit of backgrounded child processes. -- You are receiving this mail because: You are the assignee for the bug.
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