From: Dick Streefland <dick@streefland.net>
To: linux-kernel@vger.kernel.org
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Subject: autofs multi-map regression
Date: Fri, 16 Jun 2017 12:14:41 +0200 [thread overview]
Message-ID: <20170616101440.GA1480@neos> (raw)
After a recent upgrade of a Ubuntu xenial machine, a particular
autofs multi-map mount setup stopped working. A simplified example is:
::::::::::::::
auto.master
::::::::::::::
/net /etc/auto.net
::::::::::::::
auto.net
::::::::::::::
localhost / :/ /loc :/loc
Accessing /net/localhost/loc should trigger two nested bind mounts on
/net/localhost and /net/localhost/loc, but with the new kernel, it fails
with ELOOP:
$ ls /net/localhost/loc
ls: cannot open directory '/net/localhost/loc': Too many levels of symbolic links
The problem is related to the upgrade of the Ubuntu xenial kernel from
4.4.0-38.57 to 4.4.0-78.99. I bisected the regression to commit
731ac92843877f3633325203abc942193c1e9001, which is a Ubuntu backport
of this upstream kernel commit:
commit 1064f874abc0d05eeed8993815f584d847b72486
Author: Eric W. Biederman <ebiederm@xmission.com>
Date: Fri Jan 20 18:28:35 2017 +1300
mnt: Tuck mounts under others instead of creating shadow/side mounts.
--
Dick
next reply other threads:[~2017-06-16 10:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-16 10:14 Dick Streefland [this message]
2017-06-16 17:03 ` autofs multi-map regression Eric W. Biederman
2017-06-16 20:39 ` Dick Streefland
2017-06-16 21:08 ` Eric W. Biederman
2017-06-16 20:57 ` Eric W. Biederman
2017-06-16 21:41 ` Dick Streefland
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