Re: Kernel Oops with kvm 66 running WinXP

[Izik Eidus <izike@qumranet.com>]

Michal Ludvig wrote:
> Avi Kivity wrote:
>> Avi Kivity wrote:
>>> Michal Ludvig wrote:
>>>> Hi,
>>>>
>>>> I've experienced a kernel Oops on 2.6.24 with kvm 66 on AMD in 64bit 
>>>> mode while starting up WinXP:
>>>>
>>>> The host is still alive but the XP guest is locked up in a boot screen.
> 
> Hi again, just wanted to let you know that I still get this Oops with 
> kvm-68. It comes a bit later, not during the boot but after the XP 
> desktop comes up. As there were some changes in kernel/x86_emulate.c the 
> patch you provided for kvm-66 can't be applied anymore.
> 
> loaded kvm module (kvm-68)
> kvm: emulating exchange as write
> Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
>   [<ffffffff88373b4a>] :kvm:x86_emulate_insn+0x3fa/0x4240
> PGD 3145e067 PUD 409b9067 PMD 0
> Oops: 0002 [1] SMP
> CPU 0
> Modules linked in: kvm_amd kvm reiserfs tun bridge llc nfsd lockd 
> nfs_acl auth_rpcgss sunrpc exportfs iptable_filter ip_tables autofs4 
> snd_pcm_oss snd_mixer_oss w83627ehf snd_seq snd_seq_device hwmon_vid 
> ip6table_filter ip6_tables x_tables af_packet ipv6 fuse ext2 loop 
> snd_hda_intel snd_pcm snd_timer snd soundcore snd_page_alloc sr_mod 
> k8temp hwmon i2c_nforce2 button i2c_core cdrom forcedeth sg floppy 
> linear ehci_hcd ohci_hcd sd_mod usbcore dm_snapshot edd dm_mod fan 
> sata_nv pata_amd libata scsi_mod thermal processor
> Pid: 14776, comm: qemu-system-x86 Not tainted 2.6.24-mludvig #1
> RIP: 0010:[<ffffffff88373b4a>]  [<ffffffff88373b4a>] 
> :kvm:x86_emulate_insn+0x3fa/0x4240
> RSP: 0018:ffff81007d52fc18  EFLAGS: 00010246
> RAX: 000000008001003b RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff810079c5c000
> RBP: ffff810079c5d320 R08: ffff810079c5d3c0 R09: 0000000000000006
> R10: 0000000000000002 R11: 0000000000000000 R12: ffff810079c5d368
> R13: ffff810079c5d3c0 R14: ffffffff8838ab20 R15: 00000000019d1353
> FS:  0000000040800950(0063) GS:ffffffff8053e000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000000 CR3: 000000007985a000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process qemu-system-x86 (pid: 14776, threadinfo ffff81007d52e000, task 
> ffff81003f4e6780)
> Stack:  000000007d52fc74 0000000011fda618 000000000f399068 ffff810079c5d3c0
>   ffff81007d52fc94 ffffffff88368ae0 0000000000000000 ffff810079c5c000
>   ffff810079c5d320 0000000000000000 0000000000000000 0000000000000000
> Call Trace:
>   [<ffffffff88368ae0>] :kvm:seg_desct_to_kvm_desct+0x40/0xb0

ok, if we are here it mean windows did task switch,
and if windows did task switch it mean something was probably wrong before.

>   [<ffffffff88369dff>] :kvm:emulate_instruction+0x1bf/0x340
>   [<ffffffff883d99e2>] :kvm_amd:emulate_on_interception+0x12/0x60
>   [<ffffffff8836d2b9>] :kvm:kvm_arch_vcpu_ioctl_run+0x169/0x6d0
>   [<ffffffff883681fc>] :kvm:kvm_vcpu_ioctl+0x41c/0x440
>   [<ffffffff802305f3>] __wake_up+0x43/0x70
>   [<ffffffff803374c1>] __up_read+0x21/0xb0
>   [<ffffffff802586ec>] futex_wake+0xcc/0xf0
>   [<ffffffff80259559>] do_futex+0x129/0xbb0
>   [<ffffffff8022e7bd>] __dequeue_entity+0x3d/0x50
>   [<ffffffff883679c5>] :kvm:kvm_vm_ioctl+0x85/0x200
>   [<ffffffff8044357f>] thread_return+0x3a/0x62b
>   [<ffffffff8027a620>] do_writepages+0x20/0x40
>   [<ffffffff802ab10f>] do_ioctl+0x2f/0xa0
>   [<ffffffff802ab3a0>] vfs_ioctl+0x220/0x2d0
>   [<ffffffff802ab4e1>] sys_ioctl+0x91/0xb0
>   [<ffffffff8020bcae>] system_call+0x7e/0x83
> 
> 
> Code: 66 89 02 e9 ee fc ff ff 48 8b 95 88 00 00 00 48 8b 45 78 88
> RIP  [<ffffffff88373b4a>] :kvm:x86_emulate_insn+0x3fa/0x4240
>   RSP <ffff81007d52fc18>
> CR2: 0000000000000000
> ---[ end trace d485159bd8f95a33 ]---
> 
> Michal
> 
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-- 
woof.

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