linux-kernel - Re: [PATCH] mm: drop mmap_sem before calling balance_dirty

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Message-ID: <20190926185019.GA2147@bombadil.infradead.org>
Date:   Thu, 26 Sep 2019 11:50:19 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josef Bacik <josef@...icpanda.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: drop mmap_sem before calling balance_dirty_pages()
 in write fault

On Thu, Sep 26, 2019 at 04:49:23PM +0300, Kirill A. Shutemov wrote:
> It happens if the VMA got unmapped under us while we dropped mmap_sem
> and inode got freed.
> 
> Pinning the file if we drop mmap_sem fixes the issue.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reported-by: syzbot+03ee87124ee05af991bd@...kaller.appspotmail.com
> Cc: Hillf Danton <hdanton@...a.com>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Hugh Dickins <hughd@...gle.com>

Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>