linux-kernel - Re: [LTP] 56cbb429d9: ltp.fs

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Date:   Thu, 25 Jul 2019 09:32:13 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Cyril Hrubis <chrubis@...e.cz>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>, LKP <lkp@...org>,
        LKML <linux-kernel@...r.kernel.org>, ltp@...ts.linux.it
Subject: Re: [LTP] 56cbb429d9: ltp.fs_fill.fail

On Thu, Jul 25, 2019 at 6:26 AM Cyril Hrubis <chrubis@...e.cz> wrote:
>
> This looks like mkfs.vfat got EBUSY after the loop device was
> succesfully umounted.

Hmm. Smells like the RCU-delaying got triggered again.

We have that "synchronize_rcu_expedited()" in namespace_unlock(),
which is so that everything should be done by the time we return to
user space.

Al, maybe that RCU synchronization should be after the mntput()s?

               Linus