From: chenqiwu <qiwuchen55@gmail.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
chenqiwu <chenqiwu@xiaomi.com>
Subject: Re: [PATCH] mm/rmap: ensure the validity of mapping vma which referenced an anon page
Date: Wed, 11 Mar 2020 18:31:37 +0800 [thread overview]
Message-ID: <20200311103137.GA32509@cqw-OptiPlex-7050> (raw)
In-Reply-To: <20200311091943.szpvgb3tsc6ss74z@box>
On Wed, Mar 11, 2020 at 12:19:43PM +0300, Kirill A. Shutemov wrote:
> On Wed, Mar 11, 2020 at 03:45:13PM +0800, qiwuchen55@gmail.com wrote:
> > From: chenqiwu <chenqiwu@xiaomi.com>
> >
> > When finding all the mapping vmas for an anon page by anon_vma, there
> > is a panic risk that one mapping vma or its vm_mm has been released by
> > someone.
>
> What? Who would be able to release the VMA or the mm_struct? We hold
> anon_vma lock. It doesn't make sense to me. Something else is broken.
>
There is only log (no kdump) in my hand. It's hard to say who released the
VMA's mm_struct before we hold the anon_vma lock.
prev parent reply other threads:[~2020-03-11 10:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 7:45 qiwuchen55
2020-03-11 9:19 ` Kirill A. Shutemov
2020-03-11 10:31 ` chenqiwu [this message]
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