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    SubjectRe: 2.2.9-ac2 locks solid

    On Mon, 7 Jun 1999, Alan Cox wrote:

    > > >>EIP: c0196b87 <stext_lock+f67/3e60>
    > > Trace: c0127e37 <try_to_free_pages+33/44>
    > > Trace: c0128683 <__get_free_pages+6b/1d0>
    > > Trace: c010b183 <handle_IRQ_event+5f/94>
    > > Trace: c0126818 <kmem_cache_grow+114/3b8>
    > > Trace: c0113c63 <do_edge_ioapic_IRQ+7f/b0>
    > > Trace: c0126c1a <kmem_cache_alloc+fa/170>
    > > Trace: c01156a0 <send_sig_info+1c0/2f8>
    > > Trace: c0115a8e <kill_something_info+10a/11c>

    > Unfortunately I can't see how handle_IRQ_event ever directly called
    > __get_free_pages. So I don't think the IRQ part of the trace is valid.

    it's just 'dirt on the stack' probably.

    > The rest however is rather obvious 8) _iff_ you are using rt signals.
    >
    > kernel/signal.c: send_sig_info uses GFP_KERNEL from a bh.
    >
    > Change
    >
    > struct signal_queue *q = 0;
    >
    > if (nr_queued_signals < max_queued_signals) {
    > q = (struct signal_queue *)
    > kmem_cache_alloc(signal_queue_cachep, GFP_KERNEL);
    > }
    >
    > to use GFP_ATOMIC instead and let me know

    this might as well explain the 'stuck on TLB IPI wait' bugs?

    -- mingo


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