On Tue, 2014-03-11 at 16:45 -0400, Sasha Levin wrote:
> On 03/11/2014 04:30 PM, Andrew Morton wrote:
> > All I can think is that find_vma() went and returned a vma from a
> > different mm, which would be odd. How about I toss this in there?
> >
> > --- a/mm/vmacache.c~a
> > +++ a/mm/vmacache.c
> > @@ -72,8 +72,10 @@ struct vm_area_struct *vmacache_find(str
> > for (i = 0; i < VMACACHE_SIZE; i++) {
> > struct vm_area_struct *vma = current->vmacache[i];
> >
> > - if (vma && vma->vm_start <= addr && vma->vm_end > addr)
> > + if (vma && vma->vm_start <= addr && vma->vm_end > addr) {
> > + BUG_ON(vma->vm_mm != mm);
> > return vma;
> > + }
> > }
> >
> > return NULL;
>
> Bingo! With the above patch:
>
> [ 243.565794] kernel BUG at mm/vmacache.c:76!
> [ 243.566720] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
> [ 243.568048] Dumping ftrace buffer:
> [ 243.568740] (ftrace buffer empty)
> [ 243.569481] Modules linked in:
> [ 243.570203] CPU: 10 PID: 10073 Comm: trinity-c332 Tainted: G W 3.14.0-rc5-next-20140307-sasha-00010-g1f812cb-dirty #143
and this is also part of the DEBUG_PAGEALLOC + trinity combo! I suspect
the root cause it the same as Fengguang's report.
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