Re: Debugging Xen via serial console

[Emre Can Sezer <ecsezer@ncsu.edu>]

Hi Dan,

I'm currently using your version of ssplitd as it is.  I haven't tried
kdb.  For some reason I thought that was for debugging guest domains.
I'll look into it.  As for resurrecting the gdbstub, I'm *NOT* familiar 
enough
with it to try it myself. I do have a few people here who might be though.
I'll post something if we get it working.

Thanks,

John

Dan Doucette wrote:
> Hi John,
>  
> The patches I submitted quickly fell out of sync with the 3.2 unstable 
> branch at the time.  I found a month or so later they stopped working, 
> and I didnt have the time to keep them up to date.
> For Xen debugging, have you tried the kdb branch maintained my Mukesh 
> Rathor (Oracle)?  I used this a few months ago and it seemed to work.  
> The branch is off the mainline, however.  Its usage is documented in 
> the xen wiki pages, I believe.
>  
> If you would prefer to use gdb, the functionality should be easy to 
> resurrect.  There really wasnt much to it.
> I would recommend using my serial port splitter (ssplitd.c), which I 
> found easier to use and was complete in its implementation.  I 
> submitted all the changes in proper patch form after the posting you 
> referenced above, if you are interested.
>  
> Dan.
>  
>
>
>  
> On Wed, Jan 28, 2009 at 10:53 AM, Emre Can Sezer <ecsezer@ncsu.edu 
> <mailto:ecsezer@ncsu.edu>> wrote:
>
>     I'm trying to debug Xen remotely using serial port.  I followed
>     the instructions on the following post made in this xen-devel list:
>     http://lists.xensource.com/archives/html/xen-devel/2007-12/msg00678.html
>
>     I was able to connect gdb but I ran into a problem where even
>     after I clear all the breakpoints, execution traps into gdb with
>     SIGTRAP at restore_all_xen().  This only happens if I set a
>     breakpoint and then try to continue after hitting the break point.
>      If I simply connect gdb but continue without setting any
>     breakpoints, everything is OK.
>
>     The post mentions some stability issues and I haven't seen any
>     follow ups.  Is this still a viable debugging method?  Or is there
>     some other method I should try?
>
>     Thanks in advance,
>
>     John
>
>
>
>
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