RE: [Xen-devel] Domain0 crash on Bad L1 flags 800000

[Kaushik Barde <kbarde@xxxxxxxxxx>]

True, I was referring to NX bit disablement causing boot issues 32-bit
kernel without PAE support. Has anyone tested 64 bit kernels without NX bit?

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jeremy
Fitzhardinge
Sent: Tuesday, December 14, 2010 1:57 PM
To: Kaushik Barde
Cc: 'Qiangmin Lin'; olaf@xxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx;
'fanliang'
Subject: Re: [Xen-devel] Domain0 crash on Bad L1 flags 800000

On 12/14/2010 01:20 PM, Kaushik Barde wrote:
> Maybe kernel compiled with PAE (and HIGHMEM64) options, Try recompiling
> kernel without and see. 

32-bit kernels must be compiled with PAE - non-PAE 32-bit PV kernels are
not supported.

Neither option is relevant on 64-bit.

    J

> -Kaushik
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jeremy
> Fitzhardinge
> Sent: Tuesday, December 14, 2010 12:37 PM
> To: Qiangmin Lin
> Cc: olaf@xxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx; fanliang
> Subject: Re: [Xen-devel] Domain0 crash on Bad L1 flags 800000
>
> On 12/08/2010 06:53 PM, Qiangmin Lin wrote:
>> Hi all, My dom0 kernel is 2.6.32.12-xen and Xen 3.4.2.
>> I had closed "No Execute" in BIOS, but I see flags 800000 which mean
> _PAGE_NX in crash information.
>
> This looks like the same bug your colleague fanliang reported to me. Was
> this after a long period of uptime? What was running at the time?
>
> I'm curious why you're using that particular kernel, and why you're
> running with NX disabled.
>
> Thanks,
> J
>
>>  
>> (XEN) mm.c:720:d0 Bad L1 flags 800000
>> (XEN) mm.c:4203:d0 ptwr_emulate: could not get_page_from_l1e()
>> (XEN) domain_crash_sync called from entry.S
>> (XEN) Domain 0 (vcpu#2) crashed on cpu#2:
>> (XEN) ----[ Xen-3.4.2  x86_64  debug=n  Not tainted ]----
>> (XEN) CPU:    2
>> (XEN) RIP:    e033:[<ffffffffa0375fcc>]
>> (XEN) RFLAGS: 0000000000010292   EM: 0   CONTEXT: pv guest
>> (XEN) rax: ffffffffa0376120   rbx: ffff880075222000   rcx:
> 0000000000000001
>> (XEN) rdx: ffff88000402b000   rsi: 0000000000000000   rdi:
> ffff880075222048
>> (XEN) rbp: ffff880075222000   rsp: ffff8800a5db5ff8   r8:
> ffffe8ffffeb0588
>> (XEN) r9:  0000000000000001   r10: 0000000000000000   r11:
> ffffffffa0376120
>> (XEN) r12: ffff880075222048   r13: ffff8800c8a69000   r14:
> ffff880075222058
>> (XEN) r15: 00007f44fd7802d0   cr0: 0000000080050033   cr4:
> 00000000000026f0
>> (XEN) cr3: 00000008dbaf8000   cr2: ffff8800a5db5ff0
>> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
>> (XEN) Guest stack trace from rsp=ffff8800a5db5ff8:
>> (XEN)    ffff8800c8a69000 ffff880075222000 ffff88002bcc6500
> ffffffffa0376144
>> (XEN)    ffff8800c8a69000 ffff8800888f7380 ffff8800c8a690f8
> ffffffffa0377e3c
>> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
>> (XEN)    ffff8800c8a69000 ffff880075222000 ffff88002bcc6500
> ffff8800c8a69000
>> (XEN)    ffff880075222058 ffffffffa0376161 ffff8800c8a69000
> ffff8800888f7380
>> (XEN)    ffff8800c8a690f8 ffffffffa0377e3c 0000000000000000
> 0000000000000000
>> (XEN)    0000000000000000 0000000000000000 ffff8800c8a69000
> ffff880075222000
>> (XEN)    ffff88002bcc6500 ffff8800c8a69000 ffff880075222058
> ffffffffa0376161
>> (XEN)    ffff8800c8a69000 ffff8800888f7380 ffff8800c8a690f8
> ffffffffa0377e3c
>> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
>> (XEN)    ffff8800c8a69000 ffff880075222000 ffff88002bcc6500
> ffff8800c8a69000
>> (XEN)    ffff880075222058 ffffffffa0376161 ffff8800c8a69000
> ffff8800888f7380
>> (XEN)    ffff8800c8a690f8 ffffffffa0377e3c 0000000000000000
> 0000000000000000
>> (XEN)    0000000000000000 0000000000000000 ffff8800c8a69000
> ffff880075222000
>> (XEN)    ffff88002bcc6500 ffff8800c8a69000 ffff880075222058
> ffffffffa0376161
>> (XEN)    ffff8800c8a69000 ffff8800888f7380 ffff8800c8a690f8
> ffffffffa0377e3c
>> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
>> (XEN)    ffff8800c8a69000 ffff880075222000 ffff88002bcc6500
> ffff8800c8a69000
>> (XEN)    ffff880075222058 ffffffffa0376161 ffff8800c8a69000
> ffff8800888f7380
>> (XEN)    ffff8800c8a690f8 ffffffffa0377e3c 0000000000000000
> 0000000000000000
>> (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
>> [1182692.327659] BUG: unable to handle kernel
>> please help me
>> L
>>
>>
>> _______________________________________________
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>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>
> _______________________________________________
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>


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