Re: crash on boot with 4.6.1 on fedora 24

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

On 05/09/2016 12:40 PM, Kevin Moraga wrote:
>
> On 05/09/2016 09:53 AM, Jan Beulich wrote:
>>>>> On 09.05.16 at 16:52, <kmoragas@riseup.net> wrote:
>>> On 05/09/2016 04:08 AM, Jan Beulich wrote:
>>>>>>> On 09.05.16 at 00:51, <kmoragas@riseup.net> wrote:
>>>>> I'm try to compile kernel 4.4.8 (using fedora 23) to run with Xen 4.6.0
>>>>> and Intel Skylake processor (Intel Core i7-6600U)
>>>>>
>>>>> This kernel is crashing almost in the same way as explained in this
>>>>> thread... But my problem is mainly with Skylake. Because the same
>>>>> configuration works within another machine but with another processor
>>>>> (Intel Core i5-3340M). Attached are the boot logs.
>>>> The address the fault occurs on (ffff8000006bdee0) is bogus, so
>>>> from the register and stack dump alone I don't think we can derive
>>>> much. What we'd need is access to the kernel binary used (or
>>>> really the vmlinux accompanying the vmlinuz that was used), in
>>>> order to see where exactly the kernel died, and hence where this
>>>> bogus address originates from. As I understand it this is a kernel
>>>> you built yourself - can you make said binary from exactly that
>>>> build available somewhere? 
>>> Yes I have it. But I get the same crash on various 4.4.X and also with
>>> 4.5.3.
>>>
>>> **https://drive.google.com/open?id=0B6Ol0ob95UxXQV9HM1BWMmhCZ0E 
>> Well, this doesn't contain the file I'm after (vmlinux), and taking
>> apart vmlinuz would be quite cumbersome.
>>
>> Jan
>>
> Oh sorry, here is the link to vmlinux
>
> https://drive.google.com/file/d/0B6Ol0ob95UxXN0dDMWM1a29vMEk/view?usp=sharing


This is still vmlinuz but the failure is at

ffffffff81007ef3:       48 3b 1d 4e 2e ec 00    cmp   
0xec2e4e(%rip),%rbx        # 0xffffffff81ecad48
ffffffff81007efa:       73 51                   jae    0xffffffff81007f4d
ffffffff81007efc:       31 c0                   xor    %eax,%eax
ffffffff81007efe:       48 8b 15 03 d2 c0 00    mov   
0xc0d203(%rip),%rdx        # 0xffffffff81c15108
ffffffff81007f05:       90                      nop
ffffffff81007f06:       90                      nop
ffffffff81007f07:       90                      nop
ffffffff81007f08:       4c 8b 2c da             mov   
(%rdx,%rbx,8),%r13    <======
ffffffff81007f0c:       90                      nop
ffffffff81007f0d:       90                      nop
ffffffff81007f0e:       90                      nop
ffffffff81007f0f:       85 c0                   test   %eax,%eax
ffffffff81007f11:       78 3a                   js     0xffffffff81007f4d
ffffffff81007f13:       48 8b 05 ee 11 d2 00    mov   
0xd211ee(%rip),%rax        # 0xffffffff81d29108
ffffffff81007f1a:       49 39 c5                cmp    %rax,%r13
ffffffff81007f1d:       73 6f                   jae    0xffffffff81007f8e
ffffffff81007f1f:       48 8b 05 ea 11 d2 00    mov   
0xd211ea(%rip),%rax        # 0xffffffff81d29110
ffffffff81007f26:       4a 8b 04 e8             mov    (%rax,%r13,8),%rax

Any chance you could provide an un-stripped binary or System.map?

-boris


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