RE: [Xen-devel] Crash during boot in Debian lenny default dom0 kernel (2.6.26-2-xen-686)

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

Agree that Xen should not crash on such situation.

Since it is enabling MSI, I try to check the code in __pci_enable_msi(), and 
didn't find any suspicious code. As 0x ffff82c3ffeb614d is at ioremap range, I 
suspect it is about msix fixmap, but still didn't find any hint.
The page table walk is a bit strange to me. The L1 entry is suspicious, seems 
it clobered.
Can you share the code around the fault IP address?

--jyh


(XEN) Pagetable walk from ffff82c3ffeb614d:
(XEN)  L4[0x105] = 00000000bf4e2027 5555555555555555
(XEN)  L3[0x10f] = 00000000bf698063 5555555555555555
(XEN)  L2[0x1ff] = 00000000bf697063 5555555555555555
(XEN)  L1[0x0b6] = f5861e4a00100173 ffffffffffffffff
(XEN)
(XEN) ****************************************
(XEN) Panic on CPU 15:
(XEN) FATAL PAGE FAULT
(XEN) [error_code=000b]
(XEN) Faulting linear address: ffff82c3ffeb614d
(XEN) ****************************************



>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of George Dunlap
>Sent: Thursday, February 25, 2010 7:58 AM
>To: Pasi Kärkkäinen
>Cc: Sander Eikelenboom; xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] Crash during boot in Debian lenny default dom0 kernel
>(2.6.26-2-xen-686)
>
>pci=nomsi in the guest command line?
>
>I realize dom0 is a privileged guest, but it still seems like we
>should try not to crash Xen as a result on guest input. :-)
>
>Thanks for the work-around,
> -George
>
>On Wed, Feb 24, 2010 at 8:20 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>> On Wed, Feb 24, 2010 at 08:08:10PM +0100, Sander Eikelenboom wrote:
>>>
>>> Wasn't pci=nomsi required for those kernels ?
>>>
>>
>> Yeah, pci=nomsi has been the workaround for this bug..
>> Many people have seen (and reported) this bug in the lenny kernel.
>>
>> Would be good to hunt down the actual reason..
>>
>> -- Pasi
>>
>>>
>>> Wednesday, February 24, 2010, 7:47:09 PM, you wrote:
>>>
>>> > I recenty tried to boot my Debian lenny distro on a newer Intel
>>> > Nehalem box using Debian Lenny's default xen kernel
>>> > (2.6.26-2-xen-686), and it crashed during boot.  Full log attached,
>>> > but the key info is here:
>>>
>>> > I tried doing a "binary search" to see where this was introduced, but
>>> > it fails the same way all the way back to c/s 20000.
>>>
>>> > The same kernel/hypervisor combination boots fine on a different box I 
>>> > have.
>>>
>>> >  -George
>>>
>>> > (XEN) ----[ Xen-4.0.0-rc4  x86_64  debug=n  Tainted:    C ]----
>>> > (XEN) CPU:    15
>>> > (XEN) RIP:    e008:[<ffff82c4801535a9>] pci_enable_msi+0x4c9/0x580
>>> > (XEN) RFLAGS: 0000000000010282   CONTEXT: hypervisor
>>> > (XEN) rax: ffff82c3ffeb6141   rbx: 0000000000000000   rcx:
>ffff830828b0e690
>>> > (XEN) rdx: ffff830828b0e718   rsi: ffff8300bf6975b0   rdi: 
>>> > ffff830828b0e6e0
>>> > (XEN) rbp: ffff83082cd7fec8   rsp:
>ffff83082cd7fd88   r8:  0000000000000005
>>> > (XEN) r9:  ffff830828b0e700   r10: 00000000000000a8   r11:
>0000000000000040
>>> > (XEN) r12: ffff830828b0e710   r13: ffff830828b0e670   r14: 
>>> > ffff83082cd7fe38
>>> > (XEN) r15: 0000000000000000   cr0: 000000008005003b   cr4:
>00000000000026f0
>>> > (XEN) cr3: 000000043fdcf000   cr2: ffff82c3ffeb614d
>>> > (XEN) ds: 007b   es: 007b   fs: 00d8   gs: 0000   ss: 0000   cs: e008
>>> > (XEN) Xen stack trace from rsp=ffff83082cd7fd88:
>>> > (XEN)    0000000000000246 ffff830828b0e6e0 0000000080000000
>0000000100000000
>>> > (XEN)    3408000000000000 0000000200000000 000f5861e4a00100
>0000000000000141
>>> > (XEN)    ffff83082cd71ec8 ffff83082cd7fec8 0000000000000136
>ffff83082cd60000
>>> > (XEN)    0000000000000038 00000000ffffffed 0000000000000000
>ffff82c480154832
>>> > (XEN)    00000000000004d8 0000000000000038 00000000000000e0
>ffff83083fd81c80
>>> > (XEN)    ffff830828b0e670 00000000f5861e0c 0000000000000000
>ffff83082cd60000
>>> > (XEN)    ffff83082cd400f0 00000000f5861e0c 0000000000000136
>0000000000000038
>>> > (XEN)    ffff83082cd7fec8 ffff82c4801ede5f 7265646e776f206f
>ffff82c48024c080
>>> > (XEN)    ffff83082cd60180 ffff83082cd7fe98 0000000000007ff0 
>>> > ffffffffffffffff
>>> > (XEN)    0000000800000000 0000000100000000 ffff8308f5861e4a
>ffff82c4802eaa80
>>> > (XEN)    0000000800000000 0000000000000038 f5861e4a00000001
>000000000000000f
>>> > (XEN)    ffffffffffffffff ffff8300bf2e8000 0000000000000035
>0000000000000000
>>> > (XEN)    0000000000000000 0000000000000000 0000000000000000
>ffff82c4801ef863
>>> > (XEN)    0000000000000000 0000000000000000 0000000000000000
>0000000000000000
>>> > (XEN)    0000000000000035 000000000000000d 0000000000000000
>0000000000000000
>>> > (XEN)    0000000000000000 0000000000000000 0000000000000021
>00000000f5861e0c
>>> > (XEN)    00000000c033741f 00000000ffffffff 0000000000000000
>0000010000000000
>>> > (XEN)    00000000c0101427 0000000000000061 0000000000000286
>00000000f5861e08
>>> > (XEN)    0000000000000069 0000000000000000 0000000000000000
>0000000000000000
>>> > (XEN)    0000000000000000 000000000000000f ffff8300bf2e8000
>>> > (XEN) Xen call trace:
>>> > (XEN)    [<ffff82c4801535a9>] pci_enable_msi+0x4c9/0x580
>>> > (XEN)    [<ffff82c480154832>] map_domain_pirq+0x242/0x2f0
>>> > (XEN)    [<ffff82c4801ede5f>] compat_physdev_op+0xc8f/0x1010
>>> > (XEN)    [<ffff82c4801ef863>] compat_hypercall+0x83/0x90
>>> > (XEN)
>>> > (XEN) Pagetable walk from ffff82c3ffeb614d:
>>> > (XEN)  L4[0x105] = 00000000bf4e2027 5555555555555555
>>> > (XEN)  L3[0x10f] = 00000000bf698063 5555555555555555
>>> > (XEN)  L2[0x1ff] = 00000000bf697063 5555555555555555
>>> > (XEN)  L1[0x0b6] = f5861e4a00100173 ffffffffffffffff
>>> > (XEN)
>>> > (XEN) ****************************************
>>> > (XEN) Panic on CPU 15:
>>> > (XEN) FATAL PAGE FAULT
>>> > (XEN) [error_code=000b]
>>> > (XEN) Faulting linear address: ffff82c3ffeb614d
>>> > (XEN) ****************************************
>>>
>>>
>>>
>>> --
>>> Best regards,
>>>  Sander                            mailto:linux@xxxxxxxxxxxxxx
>>>
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-devel
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>>
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-devel

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel