[RFC][PATCH] Disable CLONE_PARENT for init
roland at redhat.com
Wed Jul 1 00:46:54 PDT 2009
> When global or container-init processes use CLONE_PARENT, they create a
> multi-rooted process tree.
I take this to be the real motivation for your change.
But you don't mention it in the code comment.
> + * Swapper process sets the handler for SIGCHLD to SIG_DFL. If init
> + * creates a sibling and the sibling exits, the SIGCHLD is sent to
> + * the swapper (since the swapper's handler for SIGCHLD is SIG_DFL).
> + * But since the swapper does not reap its children, the zombie will
> + * remain forever. So prevent init from using CLONE_PARENT.
This would be fixed by having swapper set its SIGCHLD to SIG_IGN instead,
so such children self-reap. That seems like the better fix for that.
If you want to make this change because of container-init issues, I think
you should just say so independent of this global-init case.
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