Date: Mon, 31 Oct 2016 00:49:58 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 213928] Reapers don't receive SIGCHLD when inheriting zombies Message-ID: <bug-213928-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213928 Bug ID: 213928 Summary: Reapers don't receive SIGCHLD when inheriting zombies Product: Base System Version: 11.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: muh.muhten@gmail.com If a process acquires reaper status with procctl (or if it's init), then when one of its children exits, its children, including zombies, get reparented. If a zombie gets reparented, the reaper receives no notification, so unless it's looping around a wait* for unspecified children, the zombie won't get reaped until the reaper exits. This doesn't seem to be a problem for init, which does indeed loop around waitpid(-1,0,0). However, it makes it hard for a correct program which acquires reaper status to do anything interesting, as such a program should not block on anything but a wait* call unless it can guarantee that none of its descendants will exit with zombies, as otherwise the system can accumulate zombies. -- You are receiving this mail because: You are the assignee for the bug.help
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