Re: Kernel Oops with kvm 66 running WinXP

[Avi Kivity <avi@qumranet.com>]

Avi Kivity wrote:
> Izik Eidus wrote:
>> 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.
>>
>>   
>
> We need to fix the oops regardless.
>
>

Oh, I think that's just garbage on the stack.  Actual oops is in 
x86_emulate_insn.

-- 
error compiling committee.c: too many arguments to function


-------------------------------------------------------------------------
This SF.net email is sponsored by the 2008 JavaOne(SM) Conference 
Don't miss this year's exciting event. There's still time to save $100. 
Use priority code J8TL2D2. 
http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone