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Date:	Fri,  7 Mar 2014 17:08:05 -0800
From:	Greg Kroah-Hartman <>
Cc:	Greg Kroah-Hartman <>,,
	Konrad Rzeszutek Wilk <>,
	Ben Hutchings <>,
	Yijing Wang <>
Subject: [PATCH 3.4 69/99] xen/smp: Fix leakage of timer interrupt line for every CPU online/offline.

3.4-stable review patch.  If anyone has any objections, please let me know.


From: Konrad Rzeszutek Wilk <>

commit 888b65b4bc5e7fcbbb967023300cd5d44dba1950 upstream.

In the PVHVM path when we do CPU online/offline path we would
leak the timer%d IRQ line everytime we do a offline event. The
online path (xen_hvm_setup_cpu_clockevents via
x86_cpuinit.setup_percpu_clockev) would allocate a new interrupt
line for the timer%d.

But we would still use the old interrupt line leading to:

kernel BUG at /home/konrad/ssd/konrad/linux/kernel/hrtimer.c:1261!
invalid opcode: 0000 [#1] SMP
RIP: 0010:[<ffffffff810b9e21>]  [<ffffffff810b9e21>] hrtimer_interrupt+0x261/0x270
.. snip..
 [<ffffffff810445ef>] xen_timer_interrupt+0x2f/0x1b0
 [<ffffffff81104825>] ? stop_machine_cpu_stop+0xb5/0xf0
 [<ffffffff8111434c>] handle_irq_event_percpu+0x7c/0x240
 [<ffffffff811175b9>] handle_percpu_irq+0x49/0x70
 [<ffffffff813a74a3>] __xen_evtchn_do_upcall+0x1c3/0x2f0
 [<ffffffff813a760a>] xen_evtchn_do_upcall+0x2a/0x40
 [<ffffffff8167c26d>] xen_hvm_callback_vector+0x6d/0x80
 [<ffffffff81666d01>] ? start_secondary+0x193/0x1a8
 [<ffffffff81666cfd>] ? start_secondary+0x18f/0x1a8

There is also the oddity (timer1) in the /proc/interrupts after
offlining CPU1:

  64:       1121          0  xen-percpu-virq      timer0
  78:          0          0  xen-percpu-virq      timer1
  84:          0       2483  xen-percpu-virq      timer2

This patch fixes it.

Signed-off-by: Konrad Rzeszutek Wilk <>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <>
Cc: Yijing Wang <>
Signed-off-by: Greg Kroah-Hartman <>

 arch/x86/xen/smp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -576,6 +576,7 @@ static void xen_hvm_cpu_die(unsigned int
 	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
 	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
 	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
+	xen_teardown_timer(cpu);

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