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    SubjectRe: [PATCH] numa, mem-hotplug: Fix stack overflow in numa when seting kernel nodes to unhotpluggable.
    On 01/28/2014 12:47 PM, Dave Jones wrote:
    > On Tue, Jan 28, 2014 at 12:47:11PM +0800, Tang Chen wrote:
    > > On 01/28/2014 11:55 AM, Dave Jones wrote:
    > > > On Tue, Jan 28, 2014 at 11:24:37AM +0800, Tang Chen wrote:
    > > >
    > > > > > I did a bisect with the patch above applied each step of the way.
    > > > > > This time I got a plausible looking result....
    > > > >
    > > > > I cannot reproduce this. Would you please share how to reproduce it ?
    > > > > Or does it just happen during the booting ?
    > > >
    > > > Just during boot. Very early. So early in fact, I have no logging facilities
    > > > like usb-serial, just what is on vga console.
    > > >
    > > > If you want me to add some printk's, I can add a while (1); before
    > > > the part that oopses so we can diagnose further..
    > >
    > > Sure. Would you please do that for me ? Maybe we can find something in
    > > the early log.
    >
    > I was hoping you'd have suggestions what you'd like me to dump ;-)

    Sorry. I didn't say it clearly. :)

    Seeing from your earlier mail, it crashed at:

    while (zonelist_zone_idx(z) > highest_zoneidx)
    de: 3b 77 08 cmp 0x8(%rdi),%esi


    I stuck this at the top of the function..

    printk(KERN_ERR "z:%p nodes:%p highest:%d\n", z, nodes, highest_zoneidx);

    and got

    z: 1d08 nodes: (null) highest:3


    nodes=null and highest=3, they are correct. When looking into
    next_zones_zonelist(),
    I cannot see why it crashed. So, can you print the zone id in the
    for_each_zone_zonelist() loop in nr_free_zone_pages() ?

    I want to know why it crashed. A NULL pointer ? Which one ?

    Thanks.

    >
    > Dave
    >
    >


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