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    SubjectRe: [BUG] kvm: dereference srcu-protected pointer without srcu_read_lock() held
    On Mon, Apr 19, 2010 at 01:08:29PM +0300, Avi Kivity wrote:
    > On 04/19/2010 12:58 PM, Lai Jiangshan wrote:
    > >Applied the patch I just sent and let CONFIG_PROVE_RCU=y,
    > >we can got the following dmesg. And we found that it is
    > >because some codes in KVM dereferences srcu-protected pointer without
    > >srcu_read_lock() held or update-side lock held.
    > >
    > >It is not hard to fix, the problem is that:
    > >Where is the most proper place to put a srcu_read_lock()?
    > >
    > >I can not determine the answer, so I report this bug
    > >instead of fixing it.
    > >
    > I think the else branch in complete_pio() should work. Marcelo?
    > Longer term I'd like to see the lock taken at the high levels
    > (ioctls, in virt/kvm) and dropped only for guest entry and when we
    > explicitly sleep (hlt emulation).
    > Note: complete_pio() is gone in the current code.

    Yes, this was fixed by 7fb2ea1e6.

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      Last update: 2010-04-20 03:49    [W:2.417 / U:0.004 seconds]
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