linux-kernel - [PATCH 0/2] (Was: BUG_ON in rcu_sync

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Message-ID: <20160926160724.GA6739@redhat.com>
Date:   Mon, 26 Sep 2016 18:07:24 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Nikolay Borisov <kernel@...p.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] (Was: BUG_ON in rcu_sync_func triggered)

Hello,

The patches do not depend on each other.

1/2 is the trivial fix, imo -stable material. The bug is very old it seems,
but today this race (leading to unbalanced unlock)  manifests itself via
mysterious BUG_ON's in rcu/sync.c.

2/2 is old, I forgot to send it before. It was already reviewed by Dave and Jan,
but the generic/068 test from xfstests triggered the warning. This was fixed by
dbad7c993053 "xfs: stop holding ILOCK over filldir callbacks" so we can hopefully
kill the early-lockdep-release kludge.

Oleg.

 fs/super.c | 43 ++++++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 15 deletions(-)