On Sat, 20 May 2017, Xishi Qiu wrote: > > Here is a bug report form redhat: > https://bugzilla.redhat.com/show_bug.cgi?id=1305620 > And I meet the bug too. However it is hard to reproduce, and > 624483f3ea82598("mm: rmap: fix use-after-free in __put_anon_vma") is not help. > > From the vmcore, it seems that the page is still mapped(_mapcount=0 and > _count=2), > and the value of mapping is a valid address(mapping = 0xffff8801b3e2a101), > but anon_vma has been corrupted. > > Any ideas?
Sorry, no. I assume that _mapcount has been misaccounted, for example a pte mapped in on top of another pte; but cannot begin tell you where in Red Hat's kernel-3.10.0-229.4.2.el7 that might happen. Hugh
