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SubjectRe: [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@linux.intel.com>
> Reported-by: syzbot+03ee87124ee05af991bd@syzkaller.appspotmail.com
> Cc: Hillf Danton <hdanton@sina.com>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Hugh Dickins <hughd@google.com>

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

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