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    SubjectRe: [linus:master] BUILD REGRESSION 2a26d99b251b8625d27aed14e97fc10707a3a81f
    On Mon, Oct 31, 2016 at 12:58:14PM +0800, Fengguang Wu wrote:
    >Hi Linus,
    >
    >On Sun, Oct 30, 2016 at 01:25:50PM -0700, Linus Torvalds wrote:
    >>On Sun, Oct 30, 2016 at 11:03 AM, kbuild test robot
    >><fengguang.wu@intel.com> wrote:
    >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    >>> 2a26d99b251b8625d27aed14e97fc10707a3a81f Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
    >>
    >>Hmm. The build errors seem to be pretty independent of that merge,
    >>including internal compiler errors etc.
    >
    >This "BUILD REGRESSION" report lists errors in all commits of a branch
    >-- ie. not only the showed HEAD commit. Sure "all commits" will be too
    >huge for the mainline kernel, so there will be limits applied.
    >
    >>Did perhaps something change in the kbuild test robot?
    >
    >Recently we lowered the threshold to 2 before sending unsolicited
    >reports like this. That threshold means when we find >= 3 errors in a
    >tree, only the first 2 will be reported in the regular way (reporting
    >to the first bad commit). The more errors will be send in a summary
    >"BUILD REGRESSION" email listing all the triggered errors.
    >
    >That's a trick to avoid flooding possibly large number of duplicate
    >error reports to LKML while avoiding hiding possibly non-duplicate
    >errors. It works well for normal branches, however looks less
    >effective for linus/master because here we have less clue about the
    >origin of errors.
    >
    >So sorry -- this report is a noise. The fix could be to raise the
    >reporting threshold significantly for linus/master. It's also possible
    >some bug in the 0day-bot triggered this report unexpectedly.

    Ah the root cause is these reminding reports for old errors

    https://lists.01.org/pipermail/kbuild-all/2016-October/026922.html
    https://lists.01.org/pipermail/kbuild-all/2016-October/025857.html
    https://lists.01.org/pipermail/kbuild-all/2016-October/026677.html
    ...

    There are some few of them, which triggered the threshold logic.

    Regards,
    Fengguang

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