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    SubjectRe: 2.6.20-rc4: known unfixed regressions (v2)
    On Tuesday 09 January 2007 18:58, Linus Torvalds wrote:
    > On Tue, 9 Jan 2007, Adrian Bunk wrote:
    > > Subject : BUG: at mm/truncate.c:60 cancel_dirty_page() (reiserfs)
    > > References :
    > > Submitter : Malte Schröder <>
    > > Status : unknown
    > Adrian, this is also available as
    > But, at worst, I don't think this is a show-stopper (oh, well: I actually
    > liked it better when "WARN_ON()" said _warning_, not BUG, since it
    > separates out the two cases visually much better, but others disagreed.
    > Crud).


    > So something interesting is definitely going on, but I don't know exactly
    > what it is. Why does reiserfs do the truncate as part of a close, if the
    > same inode is actually mapped somewhere else? And if it's a race with two
    > different CPU's (one doing a "munmap()" and the other doing a "close()",
    > then the unmap should _still_ have actually unmapped the pages before it
    > actually did _its_ "release()" call.

    This was on a single core. But with CONFIG_PREEMPT_VOLUNTARY=y.
    It didn't happen again since then.

    > In general, a filesystem should never do a truncate at "release()" time
    > _anyway_. It should do it at "drop_inode" time.
    > So I think this does show some confusion in reiserfs, but it's not
    > anything new. The only new thing is that the _message_ happens.
    > So I don't personally consider this a regression. Just a sign of old and
    > preexisting confusion that is now uncovered by new code (and it will print
    > out the scary message at most four times, and then stop complaining about
    > it. So apart from the scary message, nothing new and bad has really
    > happened).

    I also didn't reboot the machine afterwards and did not notice any problems
    beside that one message.

    Malte Schröder
    ICQ# 68121508

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