[Crash-utility] crash can't handle virsh dump file

[Gui Jianfeng]

Dave Anderson wrote:
> ----- "Gui Jianfeng" <guijianfeng at cn.fujitsu.com> wrote:
> 
>> Dave Anderson wrote:
>>> ----- "Dave Anderson" <anderson at redhat.com> wrote:
>>>
>>>> ----- "Paolo Bonzini" <pbonzini at redhat.com> wrote:
>>>>
>>>>>> According to coredump, seems crash crashed at get_idt_base().
>>>>>> device_find_instance() fails to find "cpu" instance.
>>>>> I think Dave already has a patch for this.
>>>>>
>>>>> Paolo
>>>> The patch for get_idt_base() was put in crash version 5.0.4.
>>>> Looking back at the mail archives, though, I don't see what
>>>> version Gui is/was using?
>>>>
>>>> Dave
>>> Now I see with the crash debug output that Gui is using version
>>> 5.0.3.  Can you please retry Paolo's patch on top of version
>>> 5.0.4?
>>>
>> Hi Dave,
>>
>> I did apply Paolo's patch on top of version 5.0.4, the bug is still there.
>> I checked the 5.0.4 changelog and didn't see the fix for this.
> 
> Sorry, the 5.0.4 fix I was referring to was in get_kernel_base(), which is 
> called with the result from get_idt_base().  So, just to be clear, when it
> crashes in get_idt_base(), it's because device_find_instance() call returns
> a NULL?

That's true.

> 
>   static uint64_t
>   get_idt_base(struct qemu_device_list *dl)
>   {
>           struct qemu_device_x86 *dx86 = (struct qemu_device_x86 *)
>                   device_find_instance (dl, "cpu", 0);
> 
>           return dx86->idt.base;
>   }
> 
> So, it seems that with Paolo's patch, it can find the "block" device, but
> then can no longer find the "cpu" device?

Yes.

> 
> Can you make a vmlinux/vmcore pair available for me to download?

Ok, will do later.

Thanks,
Gui

> 
> Thanks,
>   Dave
> 
>