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    SubjectRe: 2.6.19-rc1 genirq causes either boot hang or "do_IRQ: cannot handle IRQ -1"
    On Fri, Oct 06, 2006 at 06:20:54PM +0200, Muli Ben-Yehuda wrote:
    > On Fri, Oct 06, 2006 at 05:50:21PM +0200, Muli Ben-Yehuda wrote:
    >
    > > > What happens if you boot with max_cpus=1?
    > >
    > > Trying it now... woohoo, it boots all the way and stays up!
    >
    > Ok, after verifying that maxcpus=1 causes the problematic changeset to
    > boot, I also tried maxcpus=1 with the tip of the tree. I hit this NULL
    > pointer dereference in profile_tick, with and without
    > maxcpus=1. Disassembly says that get_irq_regs() is returning NULL,
    > which may or may not be related to the genirq issue.

    I ran into this as well and managed to bisect it to the following commit:

    7d12e780e003f93433d49ce78cfedf4b4c52adc5 is first bad commit
    commit 7d12e780e003f93433d49ce78cfedf4b4c52adc5
    Author: David Howells <dhowells@redhat.com>
    Date: Thu Oct 5 14:55:46 2006 +0100

    IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
    ...

    -ben
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