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

[Dave Anderson]

Hi Gui,

This is the patch that is queued for the next release:  

 http://people.redhat.com/anderson/qemu_block_kvmclock_devices.patch

I've tested it against the dumpfile that you made available.

Thank you for your help, and to Paolo for the patch.

Dave

----- "Gui Jianfeng" <guijianfeng at cn.fujitsu.com> wrote:

> Gui Jianfeng wrote:
> > 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.
> 
> Hi Dave,
> 
> Please use the following link to download the vmlinux/vmcore
> 
> http://dl.dropbox.com/u/4918988/core.dump
> http://dl.dropbox.com/u/4918988/f12_vmlinux
>