Re: [Xen-devel] [BUG] xen-mceinj tool testing cause dom0 crash

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.05.17 at 11:33, <xudong.hao@xxxxxxxxx> wrote:
>>  -----Original Message-----
>> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of Jan
>> Beulich
>> Sent: Tuesday, May 23, 2017 12:06 AM
>> To: Hao, Xudong <xudong.hao@xxxxxxxxx>
>> Cc: Lars Kurth <lars.kurth@xxxxxxxxxx>; Julien Grall <julien.grall@xxxxxxx>;
>> xen-devel@xxxxxxxxxxxxx; George Dunlap <George.Dunlap@xxxxxxxxxx>; Zhang,
>> Haozhong <haozhong.zhang@xxxxxxxxx>
>> Subject: Re: [Xen-devel] [BUG] xen-mceinj tool testing cause dom0 crash
>> 
>> >>> On 22.05.17 at 10:39, <xudong.hao@xxxxxxxxx> wrote:
>> > (XEN) Hardware Dom0 crashed: rebooting machine in 5 seconds.
>> 
>> Not this - Xen is unavoidably going to go down in such a case, yet your log 
>> has
>> no hint at all what kind of problem Dom0 experienced (e.g. whether one of the
>> injected #MC-s caused this).
>> 
> 
> Jan, 
> The first mail attached the complete log from Xen booting, hope there is 
> some hint from the full log.

I know. But did _you_ also look at that log? It goes like this

(XEN) Simulating #MC on cpu 171
(XEN) Hardware Dom0 crashed: rebooting machine in 5 seconds.
(XEN) ----[ Xen-4.9-rc  x86_64  debug=y   Tainted: MCE  ]----
(XEN) CPU:    0
(XEN) RIP:    e008:[<0000000065eb1e13>] 0000000065eb1e13

Hence my reply. I don't know what verbosity your Dom0 kernel
was set to.

Earlier on there is

(XEN) MCE: This error page is ownded by DOM 0
(XEN) mce.c:1681: MCE: Error is successfully recovered
[  237.308119] Disabling lock debugging due to kernel taint

[  237.314006] mce: [Hardware Error]: Machine check events logged

[  237.321118] Memory failure: 0x289240: reserved kernel page still referenced 
by 1 users

[  237.329872] Memory failure: 0x289240: recovery action for reserved kernel 
page: Failed

but MCE injection continue for quite a while after that, so I'd assume
(or rather guess) that original problem isn't the reason for the Dom0
crash.

Jan


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