Got this on today's git (2.6.24-rc4) while compiling  stuff - Looks
like it is related to CpuIdle stuff.
I chose CONFIG_CPU_IDLE for the first time so I don't know when this
was introduced.

This is on x86_32, SMP.

BUG: soft lockup - CPU#1 stuck for 15s! [swapper:0]

Pid: 0, comm: swapper Not tainted (2.6.24-rc4 #3)
EIP: 0060:[<c0603e22>] EFLAGS: 00000202 CPU: 1
EIP is at _spin_lock_irqsave+0x16/0x27
EAX: c06b4110 EBX: 00000001 ECX: f7873808 EDX: 00000293
ESI: 00000005 EDI: f7873808 EBP: 00000000 ESP: f7829f10
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
CR0: 8005003b CR2: 004f5960 CR3: 372c5000 CR4: 000006d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
 [<c0438233>] tick_broadcast_oneshot_control+0x10/0xda
 [<c0437c82>] tick_notify+0x1d4/0x2eb
 [<c04281b4>] get_next_timer_interrupt+0x143/0x1b4
 [<c0605819>] notifier_call_chain+0x2a/0x47
 [<c04345a0>] raw_notifier_call_chain+0x17/0x1a
 [<c04378b7>] clockevents_notify+0x19/0x4f
 [<c0533cc3>] acpi_idle_enter_simple+0x183/0x1d0
 [<c058cea3>] cpuidle_idle_call+0x53/0x78
 [<c058ce50>] cpuidle_idle_call+0x0/0x78
 [<c0402575>] cpu_idle+0x97/0xb8
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