From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48413) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UT9iL-0004eF-DW for qemu-devel@nongnu.org; Fri, 19 Apr 2013 07:42:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UT9iJ-0006J0-MM for qemu-devel@nongnu.org; Fri, 19 Apr 2013 07:42:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50844) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UT9iJ-0006In-ET for qemu-devel@nongnu.org; Fri, 19 Apr 2013 07:42:47 -0400 Date: Fri, 19 Apr 2013 14:42:43 +0300 From: Gleb Natapov Message-ID: <20130419114242.GK5807@redhat.com> References: <20130418125532.GW8997@redhat.com> <9C764699-6F9C-4AD8-A6C9-34D818753452@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] KVM VM(windows xp) reseted when running geekbench for about 2 days List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Zhanghaoyu (A)" Cc: "Huangweidong (C)" , kvm list , "mst@redhat.com" , Yan Vugenfirer , Luonengjun , "linux-kernel@vger.kernel.org" , qemu-devel , Zanghongyong , "Wangrui (K)" On Fri, Apr 19, 2013 at 01:05:08AM +0000, Zhanghaoyu (A) wrote: > >> On Thu, Apr 18, 2013 at 12:00:49PM +0000, Zhanghaoyu (A) wrote: > >>> I start 10 VMs(windows xp), then running geekbench tool on them, > >>> about 2 days, one of them was reset, I found the reset operation is > >>> done by int kvm_cpu_exec(CPUArchState *env) { > >>> ... > >>> switch (run->exit_reason) > >>> ... > >>> case KVM_EXIT_SHUTDOWN: > >>> DPRINTF("shutdown\n"); > >>> qemu_system_reset_request(); > >>> ret = EXCP_INTERRUPT; > >>> break; > >>> ... > >>> } > >>> > >>> KVM_EXIT_SHUTDOWN exit reason was set previously in triple fault handle handle_triple_fault(). > >>> > >> How do you know that reset was done here? This is not the only place > >> where qemu_system_reset_request() is called. > I used gdb to debug QEMU process, and add a breakpoint in qemu_system_reset_request(), when the case occurred, backtrace shown as below, > (gdb) bt > #0 qemu_system_reset_request () at vl.c:1964 > #1 0x00007f9ef9dc5991 in kvm_cpu_exec (env=0x7f9efac47100) > at /gt/qemu-kvm-1.4/qemu-kvm-1.4/kvm-all.c:1602 > #2 0x00007f9ef9d5b229 in qemu_kvm_cpu_thread_fn (arg=0x7f9efac47100) > at /gt/qemu-kvm-1.4/qemu-kvm-1.4/cpus.c:759 > #3 0x00007f9ef898b5f0 in start_thread () from /lib64/libpthread.so.0 > #4 0x00007f9ef86fa84d in clone () from /lib64/libc.so.6 > #5 0x0000000000000000 in ?? () > > And, I add printk log in all place where KVM_EXIT_SHUTDOWN exit reason is set, only handle_triple_fault() was called. > > > >Make sure XP is not set to auto-reset in case of BSOD. > No, winxp is not set to auto-reset in case of BSOD. No Winxp event log reported. > > > >Best regards, > >Yan. > > > >> > >>> What causes the triple fault? > >>> > >> Are you asking what is triple fault or why it happened in your case? > What I asked is why triple fault happened in my case. > >> For the former see here: http://en.wikipedia.org/wiki/Triple_fault > >> For the later it is to late to tell after VM reset. You can run QEMU > >> with -no-reboot -no-shutdown. VM will pause instead of rebooting and > >> then you can examine what is going on. > Great thanks, I'll run QEMU with -no-reboot -no-shutdown options, if VM paused in my case, what should I examined? > Register state "info registers" in the monitor for each vcpu. Code around the instruction that faulted. -- Gleb.