[Xen-devel] debugging spinlocks

[Ben Guthro <ben@xxxxxxxxxx>]

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.


-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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