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    SubjectRe: [next-20170609] WARNING: CPU: 3 PID: 71167 at lib/idr.c:157 idr_replace
    On Thu, Jun 22, 2017 at 12:31:35AM +0100, Chris Wilson wrote:
    > Quoting Tejun Heo (2017-06-13 14:58:49)
    > > Cc'ing David Airlie.
    > >
    > > This is from drm driver calling in idr_replace() w/ a negative id.
    > > Probably a silly bug in error handling path?
    >
    > No, this is the validation of an invalid userspace handle. The drm ABI
    > for handles is supposed to be a full u32 range with 0 reserved for an
    > invalid handle (constrained by the idr_alloc ofc). The WARN was
    > introduced by 0a835c4f090a.

    Matthew, did idr lost some of its range while being reimplemented
    using radix tree?

    Thanks.

    --
    tejun

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