linux-kernel - Re: [PATCH] uprobes: __replace_page() avoid BUG in munlock_vma

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Message-ID: <20200817140744.GC29865@redhat.com>
Date:   Mon, 17 Aug 2020 16:07:45 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Song Liu <songliubraving@...com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] uprobes: __replace_page() avoid BUG in munlock_vma_page()

On 08/16, Hugh Dickins wrote:
>
> --- v5.9-rc/kernel/events/uprobes.c	2020-08-12 19:46:50.851196584 -0700
> +++ linux/kernel/events/uprobes.c	2020-08-16 13:18:35.292821674 -0700
> @@ -205,7 +205,7 @@ static int __replace_page(struct vm_area
>  		try_to_free_swap(old_page);
>  	page_vma_mapped_walk_done(&pvmw);
>  
> -	if (vma->vm_flags & VM_LOCKED)
> +	if ((vma->vm_flags & VM_LOCKED) && !PageCompound(old_page))
>  		munlock_vma_page(old_page);
>  	put_page(old_page);

Thanks!

Acked-by: Oleg Nesterov <oleg@...hat.com>