From bbd5a762b4c56609ad4c501298556ab1f00710cc Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 7 Mar 2011 15:03:58 -0500 Subject: xen/hvc: Disable probe_irq_on/off from poking the hvc-console IRQ line. This fixes a particular nasty racing problem found when using Xen hypervisor with the console (hvc) output being routed to the serial port and the serial port receiving data when probe_irq_off(probe_irq_on) is running. Specifically the bug manifests itself with: [ 4.470693] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 [ 4.470693] IP: [] handle_IRQ_event+0xe/0xc9 ..snip.. [ 4.470693] Call Trace: [ 4.470693] [ 4.470693] [] handle_percpu_irq+0x3c/0x69 [ 4.470693] [] __xen_evtchn_do_upcall+0xfd/0x195 [ 4.470693] [] ? xen_restore_fl_direct_end+0x0/0x1 [ 4.470693] [] xen_evtchn_do_upcall+0x32/0x47 [ 4.470693] [] xen_do_hypervisor_callback+0x1e/0x30 [ 4.470693] [ 4.470693] [] ? hypercall_page+0x22a/0x1000 [ 4.470693] [] ? hypercall_page+0x22a/0x1000 [ 4.470693] [] ? xen_force_evtchn_callback+0xd/0xf [ 4.470693] [] ? check_events+0x12/0x20 [ 4.470693] [] ? xen_irq_enable_direct_end+0x0/0x7 [ 4.470693] [] ? probe_irq_on+0x8f/0x1d7 [ 4.470693] [] ? serial8250_config_port+0x7b7/0x9e6 [ 4.470693] [] ? uart_add_one_port+0x11b/0x305 The bug is trigged by three actors working together: A). serial_8250_config_port calling probe_irq_off(probe_irq_on()) wherein all of the IRQ handlers are being started and shut off. The functions utilize the sleep functions so the minimum time they are run is 120 msec. B). Xen hypervisor receiving on the serial line any character and setting the bits in the event channel - during this 120 msec timeframe. C). The hvc API makes a call to 'request_irq' (and hence setting desc->action to a valid value), much much later - when user space opens /dev/console (hvc_open). To make the console usable during bootup, the Xen HVC implementation sets the IRQ chip (and correspondingly the event channel) much earlier. The IRQ chip handler that is used is the handle_percpu_irq (aaca49642b92c8a57d3ca5029a5a94019c7af69f) Back to the issue. When A) is being called it ends up calling the xen_percpu_chip's chip->startup twice and chip->shutdown once. Those are set to the default_startup and mask_irq (events.c) respectivly. If (and this seems to depend on what serial concentrator you use), B) gets data from the serial port it sets in the event channel a pending bit. When A) calls chip->startup(), the masking of the pending bit, and unmasking of the event channel mask, and also setting of the upcall_pending flag is done (since there is data present on the event channel). If before the 120 msec has elapsed, any IRQ handler (Xen IRQ has one IRQ handler, which checks the event channels bitmap to figure which one to call) is called we end up calling the handle_percpu_irq. The handle_percpu_irq calls desc->action (which is NULL) and we blow up. Caveats: I could only reproduce this on 2.6.32 pvops. I am not sure why this is not showing up on 2.6.38 kernel. The probe_irq_on/off has code to disable poking specific IRQ lines. This is done by using the set_irq_noprobe() and then we do not have to worry about the handle_percpu_irq being called before the IRQ action handler has been installed. Signed-off-by: Konrad Rzeszutek Wilk --- drivers/tty/hvc/hvc_xen.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/tty') diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index 3740e327f180..c35f1a73bc8b 100644 --- a/drivers/tty/hvc/hvc_xen.c +++ b/drivers/tty/hvc/hvc_xen.c @@ -177,6 +177,8 @@ static int __init xen_hvc_init(void) } if (xencons_irq < 0) xencons_irq = 0; /* NO_IRQ */ + else + set_irq_noprobe(xencons_irq); hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256); if (IS_ERR(hp)) -- cgit v1.2.1