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Re: Multiple potential races on vma->vm_flags

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On Tue, Sep 15, 2015 at 01:36:45PM -0400, Sasha Levin wrote:
> On 09/11/2015 09:27 PM, Hugh Dickins wrote:
> > I'm inclined to echo Vlastimil's comment from earlier in the thread:
> > sounds like an overkill, unless we find something more serious than this.
> 
> I've modified my tests to stress the exit path of processes with many vmas,

Could you share the test?

> and hit the following NULL ptr deref (not sure if it's related to the original issue):
> 
> [1181047.935563] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> [1181047.937223] Modules linked in:
> [1181047.937772] CPU: 4 PID: 21912 Comm: trinity-c341 Not tainted 4.3.0-rc1-next-20150914-sasha-00043-geddd763-dirty #2554
> [1181047.939387] task: ffff8804195c8000 ti: ffff880433f00000 task.ti: ffff880433f00000
> [1181047.940533] RIP: unmap_vmas (mm/memory.c:1337)

Is it "struct mm_struct *mm = vma->vm_mm;"?

-- 
 Kirill A. Shutemov
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Thread

Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-07 13:50 +0200
  Re: Multiple potential races on vma->vm_flags Vlastimil Babka <vbabka@suse.cz> - 2015-09-09 17:30 +0200
    Re: Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-09 18:10 +0200
  Re: Multiple potential races on vma->vm_flags Sasha Levin <sasha.levin@oracle.com> - 2015-09-10 03:00 +0200
    Re: Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-10 10:40 +0200
      Re: Multiple potential races on vma->vm_flags Andrey Konovalov <andreyknvl@google.com> - 2015-09-10 15:30 +0200
        Re: Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-11 12:50 +0200
          Re: Multiple potential races on vma->vm_flags Vlastimil Babka <vbabka@suse.cz> - 2015-09-11 17:30 +0200
            Re: Multiple potential races on vma->vm_flags Vlastimil Babka <vbabka@suse.cz> - 2015-09-11 18:10 +0200
          Re: Multiple potential races on vma->vm_flags Hugh Dickins <hughd@google.com> - 2015-09-12 03:30 +0200
            Re: Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-14 12:20 +0200
            Re: Multiple potential races on vma->vm_flags Sasha Levin <sasha.levin@oracle.com> - 2015-09-15 19:40 +0200
              Re: Multiple potential races on vma->vm_flags "Kirill A. Shutemov" <kirill@shutemov.name> - 2015-09-15 21:10 +0200

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