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From: Sverd Johnsen <sverd.johnsen@googlemail.com>
Date: Thu, 1 Dec 2016 01:04:17 +0100
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Subject: 4.9-rc7 known automount/mount namespace interaction issues?
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I just tried 4.9-rc7 (next-20161130) and had some issues.
unfortunately its hard to describe for me. basically umount (the
utility) is getting blocked during stat(2) on a autofs mountpoint in a
mount namespace in scenario that worked fine in previous kernels.