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    SubjectRe: [regression] CD-ROM polling blocks suspend on some machines (Re: [PATCH 1/2] cdrom: always check_disk_change() on open)
    Hello,

    On Sat, Sep 03, 2011 at 05:14:56PM -0500, Jonathan Nieder wrote:
    > Various people[1] have been noticing a race (or races?) in which the
    > cdrom_id and scsi_id programs from udev can get stuck in the D state
    > if udev doesn't sleep a little while before running them. This
    > prevents the machine from suspending. The problem was discovered with
    > Debian kernels
    >
    > 2.6.39-1
    > 2.6.39-2
    > 3.0.0-1
    >
    > and was not experienced with kernel
    >
    > 2.6.38-5
    >
    > (These kernels are closely based on v2.6.39, v2.6.39.1, v3.0, and
    > v2.6.38.5, respectively.) Reverting commit bf2253a6f00e (cdrom:
    > always check_disk_change() on open, 2011-04-29) seems to avoid
    > trouble.
    >
    > One common theme seems to be DVD drives. Details at [1].
    >
    > Known problem? Any ideas for tracking it down?

    Can you please build vanilla kernel with CONFIG_FRAME_POINTER turned
    on, reproduce the problem and attach full dmesg output?

    Thanks.

    --
    tejun


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