From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad@darnok.org>
Subject: Re: Got kernel BUG message while PCI pass-through to
	domU
Date: Sun, 22 Jan 2012 16:23:37 -0400
Message-ID: <20120122202337.GA30288@andromeda.dapyr.net>
References: <CACeEFf4MzcMvU+uiMjG8AyT6B-yw6DQh2Y1Luo9nbVGaO_gw4A@mail.gmail.com>
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To: Eric Camachat <eric.camachat@gmail.com>
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On Sat, Jan 21, 2012 at 10:32:37PM -0800, Eric Camachat wrote:
> Hi all,
> 
> I got kernel BUG message when PCI pass through to domU (xen-pv).
> Is there any one seen this?

Yes. The fix is in the upstream kernel. Please use 3.1.

> 
> Eric
> 
> dom0 kernel config:
> $ grep XEN_PCI linux-2.6.32.24/.config
> CONFIG_XEN_PCI_PASSTHROUGH=y
> CONFIG_XEN_PCIDEV_FRONTEND=y
> CONFIG_XEN_PCIDEV_BACKEND=y
> # CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
> CONFIG_XEN_PCIDEV_BACKEND_PASS=y
> # CONFIG_XEN_PCIDEV_BACKEND_SLOT is not set
> # CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
> # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
> 
> 
> When start domU, got this error message in dom0:
> BUG: sleeping function called from invalid context at mm/slab.c:3016
> in_atomic(): 1, irqs_disabled(): 0, pid: 21, name: xenwatch
> Pid: 21, comm: xenwatch Tainted: P           2.6.32.24-ws-symbol #1
> Call Trace:
>  [<ffffffff810365e4>] __might_sleep+0xf4/0x110
>  [<ffffffff810ac478>] __kmalloc+0x118/0x140
>  [<ffffffff811c1837>] kvasprintf+0x57/0x90
>  [<ffffffff813fcd8a>] ? error_exit+0x2a/0x60
>  [<ffffffff811c18d0>] kasprintf+0x60/0x70
>  [<ffffffff810101c2>] ? check_events+0x12/0x20
>  [<ffffffff810101af>] ? xen_restore_fl_direct_end+0x0/0x1
>  [<ffffffff810ab6a7>] ? kfree+0x87/0xd0
>  [<ffffffff8123328a>] ? read_reply+0x13a/0x150
>  [<ffffffff812337ae>] join+0x4e/0x60
>  [<ffffffff8123396c>] xenbus_read+0x2c/0x70
>  [<ffffffff8123402f>] xenbus_scanf+0x2f/0xa0
>  [<ffffffff8100f82d>] ? xen_force_evtchn_callback+0xd/0x10
>  [<ffffffff810101c2>] ? check_events+0x12/0x20
>  [<ffffffff810101af>] ? xen_restore_fl_direct_end+0x0/0x1
>  [<ffffffff810ab6a7>] ? kfree+0x87/0xd0
>  [<ffffffff8123391c>] ? xenbus_printf+0xbc/0xe0
>  [<ffffffff8100f82d>] ? xen_force_evtchn_callback+0xd/0x10
>  [<ffffffff8123a600>] pciback_publish_pci_root+0x40/0x1a0
>  [<ffffffff810101af>] ? xen_restore_fl_direct_end+0x0/0x1
> nx4524-7AC4F0# [<ffffffff810ac53e>] ? kmem_cache_alloc+0x9e/0xf0
>  [<ffffffff81010e26>] ? xen_register_device_domain_owner+0x86/0xc0
>  [<ffffffff8123cc78>] pciback_publish_pci_roots+0x88/0xc0
>  [<ffffffff8123a5c0>] ? pciback_publish_pci_root+0x0/0x1a0
>  [<ffffffff8123aadd>] pciback_be_watch+0x1dd/0x290
>  [<ffffffff81232d64>] ? xs_error+0x14/0x20
>  [<ffffffff81233571>] ? xs_watch+0x51/0x60
>  [<ffffffff81233b0d>] ? register_xenbus_watch+0xdd/0xf0
>  [<ffffffff8123a900>] ? pciback_be_watch+0x0/0x290
>  [<ffffffff8123b0a9>] pciback_xenbus_probe+0x139/0x140
>  [<ffffffff81234f3a>] xenbus_dev_probe+0xaa/0x130
>  [<ffffffff8127950b>] driver_probe_device+0x7b/0x160
>  [<ffffffff812797e0>] ? __device_attach+0x0/0x50
>  [<ffffffff8127981d>] __device_attach+0x3d/0x50
>  [<ffffffff812785e8>] bus_for_each_drv+0x68/0x90
>  [<ffffffff8127973b>] device_attach+0x7b/0x80
>  [<ffffffff81278565>] bus_probe_device+0x25/0x40
>  [<ffffffff81276ac3>] device_add+0x293/0x570
>  [<ffffffff811b8da6>] ? kobject_init+0x36/0x80
>  [<ffffffff81276db9>] device_register+0x19/0x20
>  [<ffffffff81234780>] xenbus_probe_node+0x130/0x1b0
>  [<ffffffff81234996>] xenbus_dev_changed+0x196/0x1a0
>  [<ffffffff810101af>] ? xen_restore_fl_direct_end+0x0/0x1
>  [<ffffffff8103652b>] ? __might_sleep+0x3b/0x110
>  [<ffffffff812350b6>] backend_changed+0x16/0x20
>  [<ffffffff81233e4b>] xenwatch_thread+0x10b/0x150
>  [<ffffffff81057d90>] ? autoremove_wake_function+0x0/0x40
>  [<ffffffff81233d40>] ? xenwatch_thread+0x0/0x150
>  [<ffffffff81057c1e>] kthread+0x8e/0xa0
>  [<ffffffff81014dfa>] child_rip+0xa/0x20
>  [<ffffffff81013fa6>] ? int_ret_from_sys_call+0x7/0x1b
> 
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