False lockdep completion splats with loop device

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There are a ton of false lockdep splats that were introduced with
commit 2dcd5adfb740: "locking/lockdep: Remove the BROKEN flag from
CONFIG_LOCKDEP_CROSSRELEASE and CONFIG_LOCKDEP_COMPLETIONS".

I'm seeing this triggered by a number of xfstests tests, including
shared/298.  I see there was some discussion about this here:

  https://www.spinics.net/lists/linux-xfs/msg10832.html

... but I don't see any solution yet.  Is anyone working on this?

Failing that can we please make the completion lockdep something which
is optional since the false positives are incredibly !@#@!?! annoying?
That way I can still use most of lockdep, instead of being forced to
completely disable lockdep?

Thanks,

						- Ted
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