[Simh] trouble selecting VAX ethernet on CentOS

[Mark Pizzolato - Info Comm]

On Tuesday, February 28, 2012 at 9:55 PM, Michael Bloom wrote:
> That's great news.
> 
> I'm still curious as to the cause of gdb not being able to give a useful stack
> trace on your system.

The lack of a stack trace was due to the useful part of the stack being overwritten by the code in a eth_devices which was called by eth_getname.  The code in eth_devices was passed a pointer to a stack array declared in eth_getname.  The code in eth_devices wrote beyond the bounds of that array and corrupted some of the return context on the stack.

> For future reference, when  you type "disas eth_open" in gdb,  was the first
> line displayed "push %ebp"?
> 
> I'm hoping it's not.   If so,  a compile time option could make it be
> so.  But if it already is,  then something else is the cause and future
> debugging on your platform might prove to be difficult.
> 
> Michael L. Umbricht mike at umbricht.org wrote:
> 
>  > Looks like the new version is working now! I still need to boot VMS and  >
> configure the interface for DECnet, but no more segfaults.
>  >
>  > Thank you very much!
>  >
>  > -mikeu
> 
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