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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen scheduling bug?
On 15 Jul 2006, at 16:38, Stephen C. Tweedie wrote: Note the marked lines --- Xen is turning irqs _off_ at this point, when non-Xen is turning them on. I just noticed it when merging the irqtracing code. Bug? Definitely -- we shouldn't enter schedule() with interrupts disabled. I think entry-xen.S needs an audit for this kind of thing. Just a few lines above this bug we XEN_UNBLOCK_EVENTS() where we shouldn't (race to userspace against schedule/signals), and that's probably unnecessary since we will return to userspace via the IRET hypercall which will safely atomically reenable interrupts anyway. I haven't currently time to patch and test these problems -- if you can do it quicker and post a patch that would be very handy. Thanks, Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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