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(a)cn.fujitsu.com&gt; wrote: > Gui Jianfeng wrote: >> Dave Anderson wrote: >>> ----- "Gui Jianfeng" <guijianfeng(a)cn.fujitsu.com&gt; wrote: >>> >>>> Dave Anderson wrote: >>>>> ----- "Dave Anderson" <anderson(a)redhat.com&gt; wrote: >>>>> >>>>>> ----- "Paolo Bonzini" <pbonzini(a)redhat.com&gt; 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 >