Re: xen: 82599 passthrough problem

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 16/05/16 04:41, liuenliang wrote:
> Hi,all:
>
> I also met this problem when passthrough 82599 to domU by SRIOV, and the call stack as follows:
> (XEN) Xen call trace:
> (XEN)    [<ffff82c480140143>] panic+0xc3/0x1a0
> (XEN)    [<ffff82c480126f62>] symbols_lookup+0x22/0x2a0
> (XEN)    [<ffff82c480221468>] syscall_enter+0x88/0x8d
> (XEN)    [<ffff82c480221468>] syscall_enter+0x88/0x8d
> (XEN)    [<ffff82c48012750a>] __print_symbol+0x8a/0xc0
> (XEN)    [<ffff82c480221468>] syscall_enter+0x88/0x8d
> (XEN)    [<ffff82c48018d430>] show_stack+0x110/0x180
> (XEN)    [<ffff82c48016ed78>] __pirq_guest_unbind+0x2d8/0x340
> (XEN)    [<ffff82c48016ed78>] __pirq_guest_unbind+0x2d8/0x340
> (XEN)    [<ffff82c48018e274>] do_invalid_op+0x394/0x420
> (XEN)    [<ffff82c4802218f8>] handle_exception_saved+0x30/0x6e
> (XEN)    [<ffff82c48016ed76>] __pirq_guest_unbind+0x2d6/0x340
> (XEN)    [<ffff82c48016ce04>] domain_spin_lock_irq_desc+0x64/0xa0
> (XEN)    [<ffff82c48016f1dd>] pirq_guest_unbind+0x5d/0x160
> (XEN)    [<ffff82c480146b89>] pci_release_devices+0x129/0x220
> (XEN)    [<ffff82c480164028>] domain_relinquish_resources+0xa8/0x2a0
> (XEN)    [<ffff82c4801054e4>] domain_kill+0x84/0x100
> (XEN)    [<ffff82c480103364>] do_domctl+0x9c4/0x1620
> (XEN)    [<ffff82c480221468>] syscall_enter+0x88/0x8d
>
>
> 1) The version of xen-syms is xen-syms-4.1.2_115 and the passthrough is done via 'pci='. 
> 2) I using qemu-xen, and the version is 1.2.2.
> 3) This happens when I reboot the guest(HVM), but not happens all the time.
>
> BTW, the bug "corruption  caused by race conditions between device allocation and deallocation to a domain." is fixed.(the link is:
> http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=15a9f34d1b1a6c50f2da046a6e4c6726a230d089)
>
> So, anyone who knows what is the problem and any advices? Thanks.

There are several things going on there.

First of all, you look to have hit a BUG or a WARN:

(XEN)    [<ffff82c48016ed76>] __pirq_guest_unbind+0x2d6/0x340

and while trying to dump the stack to the console, you hit a further
panic in:

(XEN)    [<ffff82c480126f62>] symbols_lookup+0x22/0x2a0

For the first one, use addr2line on your debug symbols to find which
BUG() you hit, which might help you diagnose the issue.

For the second one, is there any further information from the panic on
the console?

~Andrew

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