Re: bug: host crash when vf is passthrough to vm.

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On Sat, 2014-10-11 at 11:02 +0800, ChenLiang wrote:
> Hi all:
> 
> kernel: 3.0.93-0.8-default
> qemu: 1.5

This is a very old kernel and rather old QEMU as well.  This bug is
hopefully fixed in a newer kernel.  Thanks,

Alex

> crash log:
> 
> [134397.708857] BUG: unable to handle kernel NULL pointer dereference at 0000000000000012
> [134397.717334] IP: [] iommu_disable_dev_iotlb+0x15/0x30
> [134397.724268] PGD 0
> [134397.726686] Oops: 0000 [#1] SMP
> [134397.730335] kbox: Begin to handle event info
> [134397.734992] kbox: kbox: Enter into handle die  dump while current state:Dump State Init
> [134397.751054]
> [134398.043275] kbox: End  handling event info
> [134398.047757] CPU 1
> [134398.049678] Modules linked in: mlx4_en(FX) mlx4_core(FX) compat(FX) openvswitch crc32c libcrc32c gre nm_dev(FN) ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables uvpdump i
> [134398.125560] Supported: No, Unsupported modules are loaded
> [134398.131338]
> [134398.133220] Pid: 183980, comm: qemu-kvm Tainted: GF          NX 3.0.93-0.8-default #1 HUAWEI TECHNOLOGIES CO.,LTD. CH80TXSUA/CH80TXSUA
> [134398.146013] RIP: 0010:[]  [] iommu_disable_dev_iotlb+0x15/0x30
> [134398.155649] RSP: 0018:ffff8817f0e13be0  EFLAGS: 00010202
> [134398.161342] RAX: 0000000000000002 RBX: ffff880bf34e6600 RCX: 0000000000000007
> [134398.169158] RDX: ffff880bf34e6650 RSI: 0000000000000292 RDI: ffff880bf2011000
> [134398.176970] RBP: 0000000000000000 R08: dead000000200200 R09: dead000000100100
> [134398.184793] R10: ffff8817f5d4c380 R11: ffffffff8128e350 R12: ffff880bf34e6640
> [134398.192549] R13: ffff880bf5d3de80 R14: ffff880653e4a000 R15: ffff880bf34d7858
> [134398.200360] FS:  00007f6d17fff980(0000) GS:ffff880c3ee20000(0000) knlGS:0000000000000000
> [134398.209109] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [134398.215223] CR2: 0000000000000012 CR3: 000000096ed95000 CR4: 00000000001427e0
> [134398.223000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [134398.230812] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [134398.238630] Process qemu-kvm (pid: 183980, threadinfo ffff8817f0e12000, task ffff8817804ac300)
> [134398.247906] Stack:
> [134398.250260]  ffffffff8128f756 00000000ffffffed ffff880bf34d7840 0000000000000292
> [134398.258383]  ffff880bf34d7640 ffff880653e4a090 00000000ffffffed ffff880653e4a000
> [134398.266509]  ffff880653e4a000 ffff880bee6c4878 ffffffff812938c6 ffff880bebe17d60
> [134398.274659] Call Trace:
> [134398.277503]  [] domain_remove_one_dev_info+0x156/0x280
> [134398.284582]  [] intel_iommu_attach_device+0x156/0x170
> [134398.291583]  [] kvm_assign_device+0x73/0x150 [kvm]
> [134398.298360]  [] kvm_vm_ioctl_assign_device+0x247/0x3c0 [kvm]
> [134398.306303]  [] kvm_vm_ioctl_assigned_device+0x2fc/0x6a0 [kvm]
> [134398.314401]  [] kvm_vm_ioctl+0x101/0x300 [kvm]
> [134398.320789]  [] do_vfs_ioctl+0x8b/0x3b0
> [134398.326566]  [] sys_ioctl+0xa1/0xb0
> [134398.331996]  [] system_call_fastpath+0x16/0x1b
> [134398.338376]  [<00007f6d15b77e57>] 0x7f6d15b77e56
> [134398.343373] Code: c6 05 97 dc de 00 01 eb a7 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 8b 7f 28 48 85 ff 74 12 48 8b 87 30 09 00 00 48 85 c0 74 06 40 10 01 75 05 f3 c3 0f 1f 00 e9 ab 61 00 00 66 66
> [134398.364424] RIP  [] iommu_disable_dev_iotlb+0x15/0x30
> [134398.371441]  RSP
> [134398.375314] CR2: 0000000000000012
> 
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