Re: internal-error: target_xfer_partial: Assertion `*xfered_len > 0' failed

On Fri, 2018-06-01 at 06:36 +0200, Christo wrote:
> On Wed, 2018-05-30 at 22:09 +0200, Christo wrote:
> > 
> > I get this error both on avr-gdb 7.10.1 (Installed by Linux Mint) and gdb 8.0 (which I
> > compiled
> > from source).  I don't see this error if I don't load the file with debug info into gdb.
> > Also
> > no
> > error if I use gdb 7.0.1 or 6.6 (both also compiled by me).
> I tested on gdb 8.1 compiled for AVR and still see "Saw new packet start in middle of old one"
> message, but now gdb seems to ignore the packet error and just continue without the internal
> error message.  I still would like to know where the problem is so that it can be fixed, else
> gdb may end up with incomplete information of the flash memory content on the controller.

I suspect that the culprit was on my server side, where I transmitted responses as Pascal
strings, which prepends the length of the string to the data stream.  I suspect that gdb
filtered out the extra data at the start of the replies successfully in many (but not all)
cases.  Anyway, sending the replies as byte streams without a length prefix seems to have
eliminated my problem.