Re: [Xen-devel] segfault in dom0

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

The backtrace is (innermost to outermost):
   d_lookup
   cached_lookup
   link_path_walk
   path_walk
   path_lookup
   __user_walk
   sys_lstat64
   system_call

The crash in d_lookup is due to a corrupted directory-entry hash-table
list. Doesn't look very Xen-related. This area of code isn't modified for
Xen, and no Xen drivers are involved in your data transfer.

I wonder if this is reproducible in native-x86 Linux, if you run it
with the same configuration?

 -- Keir


> Just finished copying 135 gigs of files into my dom0 system over
> the network using smbclient. No errors occured during the copy.
> Immediately afterwards i tried to run a find command, but it's
> segfaulting on me:
> 
> <1>Unable to handle kernel NULL pointer dereference at virtual address 
> 00000000
>  printing eip:                                                                
>              
> c0037d86      
> *pde=00000000(55555000)
> Oops: 0000             
> CPU:    0 
> EIP:    0819:[<c0037d86>]    Not tainted
> EFLAGS: 00211213                        
> eax: 00000000   ebx: fffffff0   ecx: 0000000d   edx: 00196f45
> esi: 00000000   edi: c07fffa0   ebp: c07fff00   esp: c07ffee0
> ds: 0821   es: 0821   ss: 0821                               
> Process find (pid: 975, stackpage=c07ff000)<1>
> Stack: c07fff50 00000000 c07fffa0 00000000 c1092758 c24bd000 00196f45 
> 00000003 
>        c07fff14 c002f571 c1d3aa40 c07fff50 c07fff50 c07fff5c c002fd40 
> c1d3aa40 
>        c07fff50 00000000 c07fffa0 c24bd000 00000000 c278f8c0 0000000e 
> c12c8974 
> Call Trace: [<c002f571>] [<c002fd40>] [<c002ffed>] [<c003015e>] [<c00303cd>]  
>  
>    [<c002cf9a>] [<c009c08b>]                                                 
>                              
> 
> I've tried running find a few times, and the only differences each time
> are in edi/ebp/esp/stackpage/stack/pid
> 
> I'm currently running rev 40f41ae00utn5d2f3tlNLcvG_QhiBA from 2004-07-13 
> 17:24:48
> 
> This also happened to me on an older rev, but i was messing about with the 
> vmmon
> stuff at the time, and i also wanted to move up to a newer rev to see if that
> fixed things before saying anything. Now, last time the find worked again 
> after
> a reboot, but that's obviously no good. For the moment this time i've just 
> left
> things as-is right now.
> 
> -- 
> Jody Belka
> knew (at) pimb (dot) org
> 
> 
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