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    SubjectRe: Mysterious CFQ crash and RCU
    On Sun, May 22, 2011 at 09:30:57PM +0200, Paul Bolle wrote:
    > On Sat, 2011-05-21 at 16:54 -0700, Paul E. McKenney wrote:
    > > On Sun, May 22, 2011 at 12:23:50AM +0200, Paul Bolle wrote:
    > > > Is anyone able to spot one or more commits in v2.6.39-rc7..v2.6.39 that
    > > > might have fixed this Oops? Or did my chance of hitting this Oops,
    > > > somehow, just got a lot smaller in v.2.6.39?
    > As I just discovered, Fedora Rawhide ships release candidates configured
    > with a lot more debugging options set than it ships final releases. So,
    > sadly, this didn't get fixed in v2.6.39. It just didn't show up because
    > one or more configuration options weren't set while they used to be set
    > in the preceding release candidates kernels.
    > > 5f45c69589b7d ("read_lock() does not always imply rcu_read_lock()") might
    > > well be a fix.
    > It doesn't really matter anymore, but that one was actually already
    > included in v2.6.39-rc5.

    OK, so maybe time to try out the debug approaches I called out earlier?

    Thanx, Paul

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