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    SubjectRe: ext3 lockdep warning in 2.6.25-rc6
    In message <1206207527.6437.83.camel@lappy>, Peter Zijlstra writes:
    > On Sat, 2008-03-22 at 10:37 -0400, Erez Zadok wrote:
    > > I was building a kernel using "make -j 4" inside a unionfs, mounted on top
    > > of ext3. The kernel is vanilla 2.6.25-rc6 plus unionfs patches. At some
    > > point I forced a cache flush using "echo 3 > /proc/sys/vm/drop_caches" and I
    > > got the lockdep warning below. Note that unionfs doesn't appear to be
    > > involved in this lockdep warning at all, so I suspect this is probably an
    > > issue between jbd and ext3 directly.
    > Known issue, drop_caches isn't production quality.

    Is this a general problem with drop_caches, or its interaction with
    ext3/jbd? If I get a similar lockdep warning with other file systems,
    should I bother to report this to the respective f/s maintainers?


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