Re: debugging spinlocks

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 30/01/12 16:27, Ben Guthro wrote:
> Konrad, et al.
>
> I'm having an issue with my guests that, when I am running wireless
> drivers in dom0, and the PV-on-HVM guest tries to access the network -
> I get a hung dom0.
>
> When I turn on
> Kernel Hacking->
> Spinlock and rw-lock debugging: basic checks
>
> The hang goes away, but does not print out anything terribly useful in
> the serial log.
>
>
> The config file  changes made by this menuconfig setting can be found below:
>
>
> While I know from other conversations, that Konrad is aware of my
> setup, for other's benefit - this is a 64bit dom0 3.2.2 kernel, with a
> few of his branches pulled in.
>
> Any thoughts, or suggestions on how best to debug these deadlocks
> would be greatly appreciated.

It looks like
http://lists.xen.org/archives/html/xen-devel/2012-01/msg01917.html might
apply to you.

Does that patch help?

~Andrew

>
> -Ben Guthro
>
>
> diff --git a/configs/config.ubuntu.amd64 b/configs/config.ubuntu.amd64
> index 205b5c6..f7a233f 100644
> --- a/configs/config.ubuntu.amd64
> +++ b/configs/config.ubuntu.amd64
> @@ -257,27 +257,27 @@ CONFIG_PADATA=y
>  # CONFIG_INLINE_SPIN_LOCK_BH is not set
>  # CONFIG_INLINE_SPIN_LOCK_IRQ is not set
>  # CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
> -CONFIG_INLINE_SPIN_UNLOCK=y
> +# CONFIG_INLINE_SPIN_UNLOCK is not set
>  # CONFIG_INLINE_SPIN_UNLOCK_BH is not set
> -CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
> +# CONFIG_INLINE_SPIN_UNLOCK_IRQ is not set
>  # CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set
>  # CONFIG_INLINE_READ_TRYLOCK is not set
>  # CONFIG_INLINE_READ_LOCK is not set
>  # CONFIG_INLINE_READ_LOCK_BH is not set
>  # CONFIG_INLINE_READ_LOCK_IRQ is not set
>  # CONFIG_INLINE_READ_LOCK_IRQSAVE is not set
> -CONFIG_INLINE_READ_UNLOCK=y
> +# CONFIG_INLINE_READ_UNLOCK is not set
>  # CONFIG_INLINE_READ_UNLOCK_BH is not set
> -CONFIG_INLINE_READ_UNLOCK_IRQ=y
> +# CONFIG_INLINE_READ_UNLOCK_IRQ is not set
>  # CONFIG_INLINE_READ_UNLOCK_IRQRESTORE is not set
>  # CONFIG_INLINE_WRITE_TRYLOCK is not set
>  # CONFIG_INLINE_WRITE_LOCK is not set
>  # CONFIG_INLINE_WRITE_LOCK_BH is not set
>  # CONFIG_INLINE_WRITE_LOCK_IRQ is not set
>  # CONFIG_INLINE_WRITE_LOCK_IRQSAVE is not set
> -CONFIG_INLINE_WRITE_UNLOCK=y
> +# CONFIG_INLINE_WRITE_UNLOCK is not set
>  # CONFIG_INLINE_WRITE_UNLOCK_BH is not set
> -CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
> +# CONFIG_INLINE_WRITE_UNLOCK_IRQ is not set
>  # CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE is not set
>  CONFIG_MUTEX_SPIN_ON_OWNER=y
>  CONFIG_FREEZER=y
> @@ -398,7 +398,7 @@ CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
>  CONFIG_ARCH_DISCARD_MEMBLOCK=y
>  # CONFIG_MEMORY_HOTPLUG is not set
>  CONFIG_PAGEFLAGS_EXTENDED=y
> -CONFIG_SPLIT_PTLOCK_CPUS=4
> +CONFIG_SPLIT_PTLOCK_CPUS=999999
>  # CONFIG_COMPACTION is not set
>  CONFIG_MIGRATION=y
>  CONFIG_PHYS_ADDR_T_64BIT=y
> @@ -4255,7 +4255,7 @@ CONFIG_TIMER_STATS=y
>  # CONFIG_DEBUG_KMEMLEAK is not set
>  # CONFIG_DEBUG_RT_MUTEXES is not set
>  # CONFIG_RT_MUTEX_TESTER is not set
> -# CONFIG_DEBUG_SPINLOCK is not set
> +CONFIG_DEBUG_SPINLOCK=y
>  # CONFIG_DEBUG_MUTEXES is not set
>  # CONFIG_DEBUG_LOCK_ALLOC is not set
>  # CONFIG_PROVE_LOCKING is not set
>
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-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com