Re: internal GDB error mourning inferior

[Luis Machado <lgustavo@codesourcery.com>]

Hi David,

Does this patch help?

http://sourceware.org/ml/gdb-patches/2013-04/msg00658.html

Luis

On 05/24/2013 10:15 PM, David Taylor wrote:
> In an unmodified gdb 7.6 , unmodified gdb 7.4.1, and a gdb 7.2-ubuntu,
> the following sequence of steps will lead to an internal error:
>
> . start up a gdb server listening on local port 5432.
>
> . freshly started gdb, no exec file, type:
>
>      target remote 127.0.0.1:5432
>
> . kill / exit the gdb server
>
> . back at gdb do:
>
>      target remote 127.0.0.1:5432
>
> again.
>
> In 7.2-ubuntu it says:
>
>      /build/buildd/gdb-7.2/gdb/target.c:2330: internal-error: could not find a target to follow mourn inferior
>      A problem internal to GDB has been detected,
>      further debugging may prove unreliable.
>      Quit this debugging session? (y or n) y
>
> In 7.6, invoked with -i=mi (this is where the problem was origianlly
> noticed), the complete output is:
>
>
>      =thread-group-added,id="i1"
>      ~"GNU gdb (GDB) 7.6\n"
>      ~"Copyright (C) 2013 Free Software Foundation, Inc.\n"
>      ~"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.  Type \"show copying\"\nand \"show warranty\" for details.\n"
>      ~"This GDB was configured as \"--host=i686-pc-linux-gnu --target=x86_64-unknown-linux-gnu\".\nFor bug reporting instructions, please see:\n"
>      ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
>      (gdb)
>      target remote localhost:5432
>      &"target remote localhost:5432\n"
>      ~"Remote debugging using localhost:5432\n"
>      =thread-group-started,id="i1",pid="42000"
>      =thread-created,id="1",group-id="i1"
>      ~"0x00000000 in ?? ()\n"
>      *stopped,frame={addr="0x00000000",func="??",args=[]},thread-id="1",stopped-threads="all"
>      ^done
>      (gdb)
>      target remote localhost:5432
>      &"target remote localhost:5432\n"
>      =thread-group-exited,id="i1"
>      &"Remote connection closed\n"
>      Abort (core dumped)
>
> I have not tried it with top of trunk.
>
> If it matters, it was built to be hosted on i686-pc-linux-gnu,
> targetting x86_64-unknown-linux-gnu, running on an x86-64 linux box.
>
> [The targets we want to debug are x86-64, but not everyone has a 64 bit
> desktop as yet; however, everyone has an Intel based GNU/Linux box.]
>
>