On Wed, Oct 17, 2012 at 03:04:49PM +0800, Xiao Guangrong wrote: > On 10/17/2012 02:43 PM, Fengguang Wu wrote: > > On Wed, Oct 17, 2012 at 02:26:22PM +0800, Xiao Guangrong wrote: > >> On 09/14/2012 01:57 PM, Xiao Guangrong wrote: > >>> On 09/12/2012 04:15 PM, Avi Kivity wrote: > >>>> On 09/12/2012 07:40 AM, Fengguang Wu wrote: > >>>>> Hi, > >>>>> > >>>>> 3 of my test boxes running v3.5 kernel become unaccessible and I find > >>>>> two of them kept emitting this dmesg: > >>>>> > >>>>> vmx_handle_exit: unexpected, valid vectoring info (0x80000b0e) and exit > >>>>> reason is 0x31 > >>>>> > >>>>> The other one has froze and the above lines are the last dmesg. > >>>>> Any ideas? > >>>> > >>>> First, that printk should be rate-limited. > >>>> > >>>> Second, we should add EXIT_REASON_EPT_MISCONFIG (0x31) to > >>>> > >>>> if ((vectoring_info & VECTORING_INFO_VALID_MASK) && > >>>> (exit_reason != EXIT_REASON_EXCEPTION_NMI && > >>>> exit_reason != EXIT_REASON_EPT_VIOLATION && > >>>> exit_reason != EXIT_REASON_TASK_SWITCH)) > >>>> printk(KERN_WARNING "%s: unexpected, valid vectoring info " > >>>> "(0x%x) and exit reason is 0x%x\n", > >>>> __func__, vectoring_info, exit_reason); > >>>> > >>>> since it's easily caused by the guest. > >>> > >>> Yes, i will do these. > >>> > >>>> > >>>> Third, it's really unexpected. It seems the guest was attempting to > >>>> deliver a page fault exception (0x0e) but encountered an mmio page > >>>> during delivery (in the IDT, TSS, stack, or page tables). Is this > >>>> reproducible? If so it's easy to patch kvm to halt in that case and > >>>> allow examining the guest via qemu. > >>>> > >>> > >>> Have no idea yet why the box was frozen under this case, will try to > >>> write a test case, > >>> hope it can help me to find the reason out. > >>> > >> > >> Still did not know why linux kernel triggered it. I have posted > >> a patchset to report an internal error for this case, hoping > >> Fengguang can reproduce it after the patchset and Qemu's dump > >> can help us to find the reason out. > >> > >> I will keep working on it. > > > > Thanks! Shall I run some patched kernel, or just 3.6.0? > > The patchset is under review. Can be found at: > https://lkml.org/lkml/2012/10/17/31
Thanks, I'll try it. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
