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    SubjectRe: ext3 lockdep warning in 2.6.25-rc6
    On Sat, 2008-03-22 at 18:34 -0400, Erez Zadok wrote:
    > 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?

    Its a generic problem with drop_caches. If you look in the lkml archives
    you'll find similar reports against XFS and others.

    Some time ago Andrew outlined a fix for it, but so far that hasn't

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      Last update: 2008-03-23 12:11    [W:0.020 / U:25.892 seconds]
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