Re: [regression] KVM: hangs and "irq timeout" booting HURD unless -no-kvm-irqchip passed

[Avi Kivity <avi@redhat.com>]

On 02/07/2011 08:00 AM, Jonathan Nieder wrote:
> Hi kvm-ers,
>
> When I boot the HURD with
>
> 	kvm -m 768 -net nic,model=ne2k_pci -net user hurd-installed.qemu
>
> it hangs and eventually produces two messages:
>
> 	hd0: unexpected_intr: status=0x58 { DriveReady SeekComplete DataRequest }
> 	hd0: irq timeout: status=0x58 { DriveReady Seek Complete DataRequest }
>
> More details below[1].
>
> Adding -no-kvm-irqchip to the kvm command line fixes it --- no
> more hangs or confusing messages (thanks, Guillem!).
>
> Bisects (thanks to Michael for the idea) to
>
> 	v2.6.37-rc1~142^2~39 (KVM: Check for pending events before
> 	attempting injection, 2010-07-27).
>
> Bisection log and kernel configuration available upon request (but
> probably not too relevant --- the 2.6.37 distro kernel from Debian
> exhibits the same problem).  Reproducible with kvm/master (2d4b4d26,
> 2011-02-01).
>
> CPU is a dual-core AMD Athlon II P360, family 16, model 6.
>
> Any hints for tracking this down?  For those wanting to follow along
> at home, you can find a HURD cd to try at [2].
>

Reproduced on AMD, not on Intel.  Given that I see a few PIC and PIT 
PIOs before the hang, the problem is likely at the PIT.  Will look further.

-- 
error compiling committee.c: too many arguments to function