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Subject: [Bug 212048] waitpid returns uninitialized status when WNOHANG
 option is used
Date: Mon, 22 Aug 2016 13:55:45 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.3-RELEASE
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: caseylucas@gmail.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212048

            Bug ID: 212048
           Summary: waitpid returns uninitialized status when WNOHANG
                    option is used
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: caseylucas@gmail.com

When the WNOHANG option is used with waitpid, uninitialized memory is retur=
ned
in the 'status' result if no child process is available.  This was first
noticed when the return value from Python os.waitpid was trashed / unreliab=
le.

See 'status' variable in kern_exit.c::sys_wait4

Demonstration of problem:
https://gist.github.com/caseylucas/df2eea85741ea892328c3f8c558cfa75

Stackoverflow reference:
http://stackoverflow.com/questions/38984449/is-status-value-from-os-waitpid=
-unreliable-when-os-wnohang-is-used-under-freebsd

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