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    SubjectRe: KASLR causes intermittent boot failures on some systems
    Date
    Baoquan He <bhe@redhat.com> writes:

    > On 04/07/17 at 10:41am, Jeff Moyer wrote:
    >> Hi,
    >>
    >> commit 021182e52fe01 ("x86/mm: Enable KASLR for physical mapping memory
    >> regions") causes some of my systems with persistent memory (whether real
    >> or emulated) to fail to boot with a couple of different crash
    >> signatures. The first signature is a NMI watchdog lockup of all but 1
    >> cpu, which causes much difficulty in extracting useful information from
    >> the console. The second variant is an invalid paging request, listed
    >> below.
    >>
    >> On some systems, I haven't hit this problem at all. Other systems
    >> experience a failed boot maybe 20-30% of the time. To reproduce it,
    >> configure some emulated pmem on your system. You can find directions
    >> for that here: https://nvdimm.wiki.kernel.org/
    >
    > I got below problem when configure ndctl, didn't find a package named
    > libkmod:

    Sorry, you can skip the ndctl step altogether. This is emulated pmem,
    so the setting won't stick anyway.

    -Jeff

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