Messages in this thread | | | Date | Mon, 12 Nov 2012 03:55:16 -0800 | Subject | Re: [PATCH 03/16] mm: check rb_subtree_gap correctness | From | Michel Lespinasse <> |
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On Fri, Nov 9, 2012 at 6:13 AM, Sasha Levin <levinsasha928@gmail.com> wrote: > While fuzzing with trinity inside a KVM tools (lkvm) guest, using today's -next > kernel, I'm getting these: > > [ 117.007714] free gap 7fba0dd1c000, correct 7fba0dcfb000 > [ 117.019773] map_count 750 rb -1 > [ 117.028362] ------------[ cut here ]------------ > [ 117.029813] kernel BUG at mm/mmap.c:439! > > Note that they are very easy to reproduce.
Thanks for the report. I had trouble reproducing this on Friday, but after Hugh came up with an easy test case I think I have it figured out. I sent out a proposed fix as "[PATCH 0/3] fix missing rb_subtree_gap updates on vma insert/erase". Let's follow up the discussion there if necessary.
Cheers,
-- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies.
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