Re: [PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-04-03 Thread Konrad Rzeszutek Wilk
On Wed, Apr 03, 2013 at 08:00:37PM +0800, Zhenzhong Duan wrote: > > On 2013-04-01 20:41, Konrad Rzeszutek Wilk wrote: > >On Mon, Apr 01, 2013 at 01:26:34PM +0800, Zhenzhong Duan wrote: > >>On 2013-03-29 21:46, Konrad Rzeszutek Wilk wrote: > >>>On Fri, Mar 29, 2013 at 03:22:38PM +0800, Zhenzhong Du

Re: [PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-04-03 Thread Zhenzhong Duan
On 2013-04-01 20:41, Konrad Rzeszutek Wilk wrote: On Mon, Apr 01, 2013 at 01:26:34PM +0800, Zhenzhong Duan wrote: On 2013-03-29 21:46, Konrad Rzeszutek Wilk wrote: On Fri, Mar 29, 2013 at 03:22:38PM +0800, Zhenzhong Duan wrote: The problem is even without overwrite, like xapic system, xen_sen

Re: [PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-04-01 Thread Konrad Rzeszutek Wilk
On Mon, Apr 01, 2013 at 01:26:34PM +0800, Zhenzhong Duan wrote: > > On 2013-03-29 21:46, Konrad Rzeszutek Wilk wrote: > >On Fri, Mar 29, 2013 at 03:22:38PM +0800, Zhenzhong Duan wrote: > >>nmi isn't supported in dom0, fallback to general all cpu backtrace code. > >> > >>Without fix, on xapic syste

Re: [PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-03-31 Thread Zhenzhong Duan
On 2013-03-29 21:46, Konrad Rzeszutek Wilk wrote: On Fri, Mar 29, 2013 at 03:22:38PM +0800, Zhenzhong Duan wrote: nmi isn't supported in dom0, fallback to general all cpu backtrace code. Without fix, on xapic system, sysrq+l, no backtrace is showed. On x2apic enabled system, got NULL pointer d

Re: [PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-03-29 Thread Konrad Rzeszutek Wilk
On Fri, Mar 29, 2013 at 03:22:38PM +0800, Zhenzhong Duan wrote: > nmi isn't supported in dom0, fallback to general all cpu backtrace code. > > Without fix, on xapic system, sysrq+l, no backtrace is showed. > On x2apic enabled system, got NULL pointer dereference as below. Why would the x2APIC or

[PATCH] xen: Don't call arch_trigger_all_cpu_backtrace in dom0(pvm)

2013-03-29 Thread Zhenzhong Duan
nmi isn't supported in dom0, fallback to general all cpu backtrace code. Without fix, on xapic system, sysrq+l, no backtrace is showed. On x2apic enabled system, got NULL pointer dereference as below. SysRq : Show backtrace of all active CPUs BUG: unable to handle kernel NULL pointer dere