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    From
    SubjectRe: [2.6.33-rc5] Weird deadlock when shutting down
    Date
    Américo Wang <xiyou.wangcong@gmail.com> wrote:

    > > =======================================================
    > > [ INFO: possible circular locking dependency detected ]
    > > 2.6.34-rc2-cachefs #115
    > > -------------------------------------------------------
    > > halt/2291 is trying to acquire lock:
    > >  (s_active#31){++++.+}, at: [<ffffffff81104950>] sysfs_addrm_finish+0x31/0x5a
    > >
    > > but task is already holding lock:
    > >  (&per_cpu(cpu_policy_rwsem, cpu)){+++++.}, at: [<ffffffff812a3a92>] lock_policy_rwsem_write+0x4a/0x7b
    > >
    > > which lock already depends on the new lock.
    > >
    >
    >
    > I already send a patch for this:
    >
    > https://patchwork.kernel.org/patch/83558/
    >
    > It is still in -mm tree, I think.

    Tested-by: David Howells <dhowells@redhat.com>
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