Re: 3.8.0-rc0 on xen-unstable: RCU Stall during boot as dom0 kernel after IOAPIC

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Dec 14, 2012 at 04:55:57PM +0100, Sander Eikelenboom wrote:
> Hi Konrad,
> 
> I just tried to boot a 3.8.0-rc0 kernel (last commit: 7313264b899bbf3988841296265a6e0e8a7b6521) as dom0 on my machine with current xen-unstable.

Yeah, saw it over the Dec 11->Dec 12 merges and was out on
vacation during that time (just got back).

Did you by any chance try to do a git bisect to narrow down
which merge it was?

Thanks!
> The boot stalls:
> 
> [    0.000000] ACPI: PM-Timer IO Port: 0x808
> [    0.000000] ACPI: Local APIC address 0xfee00000
> [    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x05] lapic_id[0x04] enabled)
> [    0.000000] ACPI: LAPIC (acpi_id[0x06] lapic_id[0x05] enabled)
> [    0.000000] ACPI: IOAPIC (id[0x06] address[0xfec00000] gsi_base[0])
> [    0.000000] IOAPIC[0]: apic_id 6, version 33, address 0xfec00000, GSI 0-23
> [    0.000000] ACPI: IOAPIC (id[0x07] address[0xfec20000] gsi_base[24])
> [    0.000000] IOAPIC[1]: apic_id 7, version 33, address 0xfec20000, GSI 24-
> [   64.598628] INFO: rcu_preempt detected stalls on CPUs/tasks:
> [   64.598676]  0: (1 GPs behind) idle=aed/140000000000000/0 drain=5 . timer not pending
> [   64.598683]  (detected by 1, t=18004 jiffies, g=18446744073709551414, c=18446744073709551413, q=162)
> [   64.598692] sending NMI to all CPUs:
> [   64.598716] xen: vector 0x2 is not implemented
> 
> 
> Perhaps an interesting line is the incomplete (no end of range, and it stalls there some time before the kernel reports the stall itself:
> [    0.000000] IOAPIC[1]: apic_id 7, version 33, address 0xfec20000, GSI 24-
> 
> 
> The exact seem config with 3.7.0 as kernel works fine.
> Complete serial log is attached.
> 
> --
> 
> Sander
> 
>