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@xxxxxxxxx wrote: > > From: chenqiwu <chenqiwu@xxxxxxxxxx> > > > > 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.
