From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: irqfd issue Date: Tue, 7 May 2013 12:12:09 +0300 Message-ID: <20130507091209.GJ12349@redhat.com> References: <20130507013730.GA8395@hj.localdomain> <20130507075536.GD12349@redhat.com> <20130507081450.GA13576@hj.localdomain> <20130507081838.GG12349@redhat.com> <20130507083650.GA14268@hj.localdomain> <20130507084207.GH12349@redhat.com> <20130507091040.GA14460@hj.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" , Cornelia Huck To: Asias He Return-path: Received: from mx1.redhat.com ([209.132.183.28]:29960 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759198Ab3EGJMN (ORCPT ); Tue, 7 May 2013 05:12:13 -0400 Content-Disposition: inline In-Reply-To: <20130507091040.GA14460@hj.localdomain> Sender: kvm-owner@vger.kernel.org List-ID: On Tue, May 07, 2013 at 05:10:41PM +0800, Asias He wrote: > On Tue, May 07, 2013 at 11:42:07AM +0300, Gleb Natapov wrote: > > On Tue, May 07, 2013 at 04:36:50PM +0800, Asias He wrote: > > > On Tue, May 07, 2013 at 11:18:38AM +0300, Gleb Natapov wrote: > > > > On Tue, May 07, 2013 at 04:14:50PM +0800, Asias He wrote: > > > > > On Tue, May 07, 2013 at 10:55:36AM +0300, Gleb Natapov wrote: > > > > > > On Tue, May 07, 2013 at 09:37:30AM +0800, Asias He wrote: > > > > > > > Hi, > > > > > > > > > > > > > > I am seeing this with linus/master. Any ideas? > > > > > > > > > > > > > How reproducible it this? What HEAD are you seeing this with? > > > > > > > > > > Almost always. Start a guest with vhost-net on. > > > > > > > > > It happens during start or on VM exit? The trace shows do_exit() > > > > > > > > > QEMU : e3351000cd682200835763caca87adf708ed1c65 > > > > > KERNEL: 51a26ae7a14b85c99c9be470c2d28eeeba0f26a3 > > > > > > > > > Can you try with kvm.git next branch? > > > > > > With next branch db6ae6158186a17165ef990bda2895ae7594b039, > > > > > Can you revert a0f155e9646d5f1c263f6f9aae880151100243bb and try again? > > The issue is gone with a0f155e9646d5f1c263f6f9aae880151100243bb > reverted. > Cornelia, any ideas? > > > [ 53.386936] device tap0 entered promiscuous mode > > > [ 53.386990] br0: port 2(tap0) entered forwarding state > > > [ 53.386997] br0: port 2(tap0) entered forwarding state > > > [ 80.096275] BUG: unable to handle kernel NULL pointer dereference at (null) > > > [ 80.098592] IP: [] _raw_spin_lock+0xe/0x30 > > > [ 80.100988] PGD 0 > > > [ 80.103339] Oops: 0002 [#1] SMP > > > [ 80.105668] Modules linked in: vhost_net > > > [ 80.108005] CPU 6 > > > [ 80.108026] Pid: 4257, comm: qemu-system-x86 Not tainted 3.9.0-rc3+ #757 Dell Inc. OptiPlex 790/0V5HMK > > > [ 80.112662] RIP: 0010:[] [] _raw_spin_lock+0xe/0x30 > > > [ 80.115030] RSP: 0018:ffff880221721cc8 EFLAGS: 00010046 > > > [ 80.117365] RAX: 0000000000000100 RBX: ffff88022dcc003f RCX: ffff880221734950 > > > [ 80.119688] RDX: ffff8802208f6ca8 RSI: 000000007fffffff RDI: 0000000000000000 > > > [ 80.121982] RBP: ffff880221721cc8 R08: 0000000000000002 R09: 0000000000000002 > > > [ 80.124230] R10: 00007f7fd01087e0 R11: 0000000000000246 R12: ffff8802208f6ca8 > > > [ 80.126489] R13: 0000000000000080 R14: ffff880223e2a900 R15: 0000000000000000 > > > [ 80.128718] FS: 00007f7fd38488e0(0000) GS:ffff88022dcc0000(0000) knlGS:0000000000000000 > > > [ 80.130921] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > [ 80.133130] CR2: 0000000000000000 CR3: 000000022309f000 CR4: 00000000000427e0 > > > [ 80.135345] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > [ 80.137543] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > > > [ 80.139708] Process qemu-system-x86 (pid: 4257, threadinfo ffff880221720000, task ffff880222bd5640) > > > [ 80.141887] Stack: > > > [ 80.144064] ffff880221721d08 ffffffff810ac5c5 ffff88022431dc00 0000000000000086 > > > [ 80.146316] 0000000000000080 ffff880223e2a900 ffff8802208f6ca8 0000000000000000 > > > [ 80.148558] ffff880221721d48 ffffffff810ac8fe 0000000000000000 ffff880221734000 > > > [ 80.150784] Call Trace: > > > [ 80.152975] [] __queue_work+0x45/0x2d0 > > > [ 80.155193] [] queue_work_on+0x8e/0xa0 > > > [ 80.157374] [] queue_work+0x19/0x20 > > > [ 80.159505] [] irqfd_deactivate+0x4b/0x60 > > > [ 80.161621] [] kvm_irqfd+0x39d/0x580 > > > [ 80.163717] [] kvm_vm_ioctl+0x207/0x5b0 > > > [ 80.165832] [] ? update_curr+0xf5/0x180 > > > [ 80.167931] [] do_vfs_ioctl+0x98/0x550 > > > [ 80.170013] [] ? finish_task_switch+0x4e/0xe0 > > > [ 80.172109] [] ? __schedule+0x2ea/0x710 > > > [ 80.174218] [] sys_ioctl+0x57/0x90 > > > [ 80.176338] [] ? trace_hardirqs_on_thunk+0x3a/0x3c > > > [ 80.178467] [] system_call_fastpath+0x16/0x1b > > > [ 80.180598] Code: c1 ea 08 38 c2 74 0f 66 0f 1f 44 00 00 f3 90 0f b6 03 38 c2 75 f7 48 83 c4 08 5b c9 c3 55 48 89 e5 66 66 66 66 90 b8 00 01 00 00 66 0f c1 07 89 c2 66 c1 ea 08 38 c2 74 0c 0f 1f 00 f3 90 0f > > > [ 80.183098] RIP [] _raw_spin_lock+0xe/0x30 > > > [ 80.185372] RSP > > > [ 80.187584] CR2: 0000000000000000 > > > [ 80.208627] ---[ end trace 13fb1e4b6e5ab21f ]--- > > > > > > > -- > > > > Gleb. > > > > > > -- > > > Asias > > > > -- > > Gleb. > > -- > Asias -- Gleb.