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    SubjectRe: kvm segfaults and bad page state in 3.4.0
    Hi Fengguang,

    I can reproduce this bug in my test case, and have posted
    a patch to fix it which can found at:
    http://marc.info/?l=linux-mm&m=134129723504527&w=2

    Could you please try it?

    On 06/04/2012 07:46 PM, Fengguang Wu wrote:
    > Hi,
    >
    > I'm running lots of kvm instances for doing kernel boot tests.
    > Unfortunately the test system itself is not stable enough, I got scary
    > errors in both kvm and the host kernel. Like this.
    >
    > [294025.795382] kvm used greatest stack depth: 2896 bytes left
    > [310388.622083] kvm[1864]: segfault at c ip 00007f498e9f6a81 sp 00007f4994b9fca0 error 4 in kvm[7f498e960000+33b000]
    > [310692.050589] kvm[4332]: segfault at 10 ip 00007fca662620b9 sp 00007fca70472af0 error 6 in kvm[7fca661cc000+33b000]
    > [312608.950120] kvm[18931]: segfault at 8 ip 00007f95962a10a5 sp 00007f959d777170 error 4 in kvm[7f959620b000+33b000]
    > [312622.941640] kvm[19123]: segfault at 10 ip 00007f406f5580b9 sp 00007f4077d8b350 error 6 in kvm[7f406f4c2000+33b000]
    > [313917.860951] kvm[28789]: segfault at c ip 00007f718f4dfa81 sp 00007f7198459520 error 4 in kvm[7f718f449000+33b000]
    > [313919.177192] kvm used greatest stack depth: 2864 bytes left
    > [314061.390945] kvm used greatest stack depth: 2208 bytes left
    > [327479.676068] BUG: Bad page state in process kvm pfn:59ac9



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