Re: [Xen-devel] Linux kernel 3.12 regression, Dom0 fails to boot on Core 2 6400

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

----- wei.liu2@xxxxxxxxxx wrote:

> Hi Konrad
> 
> Just notice a regression on 3.12 kernel, Dom0 fails to boot early on
> with following message:
> 
> (XEN) traps.c:455:d0 Unhandled invalid opcode fault/trap [#6] on VCPU
> 0 [ec=0000]
> (XEN) domain_crash_sync called from entry.S                           
>             
> (XEN) Domain 0 (vcpu#0) crashed on cpu#0:                             


The will be fixed in mainline as soon as Linus pulls our tree:

https://lkml.org/lkml/2013/9/25/270

-boris



>          
> (XEN) ----[ Xen-4.4-unstable  x86_64  debug=y  Tainted:    C ]----    
>          
> (XEN) CPU:    0                                                       
>          
> (XEN) RIP:    e033:[<ffffffff81b6a48e>]                               
>          
> (XEN) RFLAGS: 0000000000000292   EM: 1   CONTEXT: pv guest            
>          
> (XEN) rax: 000000000000006a   rbx: ffffffff8148c255   rcx:
> 00000000000000aa        
> (XEN) rdx: 0000000000000032   rsi: 0000000000000006   rdi:
> 0000000000000000        
> (XEN) rbp: ffffffff82201e38   rsp: ffffffff82201dd8   r8: 
> 0000000000000000        
> (XEN) r9:  6465746365707865   r10: 000000000000009d   r11:
> 6820746120706f20        
> (XEN) r12: ffffffff810199e0   r13: ffffffff82309c18   r14:
> ffffffff81c01f04        
> (XEN) r15: 0000000000000000   cr0: 0000000080050033   cr4:
> 00000000000026f0        
> (XEN) cr3: 000000021e20c000   cr2: 0000000000000000                   
>          
> (XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033 
>          
> (XEN) Guest stack trace from rsp=ffffffff82201dd8:                    
>          
> (XEN)    00000000000000aa 6820746120706f20 ffffffff81b6a48e
> 000000010000e030       
> (XEN)    0000000000010092 ffffffff82201e18 000000000000e02b
> ffffffff81b6a48e       
> (XEN)    ffffffff00000000 ffffffff00000000 ffffffff81ffb05d
> ffffffff00000035       
> (XEN)    ffffffff82201e78 ffffffff810176a4 ffffffe800000000
> 90666666663a3e50       
> (XEN)    ffffffff82309c10 0000000000000001 ffffffff824b3c20
> ffff88021a138740       
> (XEN)    ffffffff82201ea8 ffffffff81017889 ffffffff82305a58
> 0000441f0f000000       
> (XEN)    ffffffff824b3c40 ffffffff82309c10 ffffffff82201ed8
> ffffffff823549f5       
> (XEN)    0000000000000065 ffffffffffffffff ffffffff823d0020
> ffffffff823da2e0       
> (XEN)    ffffffff82201f28 ffffffff82331ca5 ffffffff8233186d
> ffffffff82652000       
> (XEN)    ffffffff82659038 ffffffff823da2e0 00000000f3dfffff
> 0000000000000000    
> (XEN)    0000000000000000 0000000000000000 ffffffff82201f38
> ffffffff823315e0    
> (XEN)    ffffffff82201ff8 ffffffff82335484 0000000100000000
> 00020800000006f6    
> (XEN)    1fc9cbf580002281 0300000100000032 0000000000000005
> 0000000000000020    
> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000    
> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000    
> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000    
> (XEN)    0000000000000000 0000000000000000 0000000000000000
> 0000000000000000    
> (XEN)    0000000000000000 0f00000060c0c748 ccccccccccccc305
> cccccccccccccccc    
> (XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc
> cccccccccccccccc    
> (XEN)    cccccccccccccccc cccccccccccccccc cccccccccccccccc
> cccccccccccccccc    
> (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
> 
> Biscetion shows that it's due to the change in jump label.
> 
> commit 442e0973e9273ae8832abd70f52efde8b8326178                       
>          
> Merge: 8d7551e fb40d7a                                                
>          
> Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>                
>          
> Date:   Tue Sep 10 19:43:23 2013 -0700                                
>          
>                                                                       
>          
>     Merge branch 'x86/jumplabel' of
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>                                                                       
>          
>     Pull x86 jumplabel changes from Peter Anvin:                      
>          
>      "One more x86 tree for this merge window.  This tree improves the
>          
>       handling of jump labels, so that most of the time we don't have
> to do     
>       a massive initial patching run.                                 
>          
>                                                                       
>          
>       Furthermore, we will error out of the jump label is not what is 
>          
>       expected, eg if it has been corrupted or tampered with"         
>          
>                                                                       
>          
>     * 'x86/jumplabel' of
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: 
>       x86/jump-label: Show where and what was wrong on errors         
>          
>       x86/jump-label: Add safety checks to jump label conversions     
>          
>       x86/jump-label: Do not bother updating nops if they are correct 
>          
>       x86/jump-label: Use best default nops for inital jump label
> calls 
> 
> Hardware matters. I can only see the crash on Intel(R) Core(TM)2 6400
> @
> 2.13GHz.
> 
> Wei.
> 
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> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

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