[Bug python/21698] New: Stepping from python interface broken?

["belagod at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21698

            Bug ID: 21698
           Summary: Stepping from python interface broken?
           Product: gdb
           Version: 8.0.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: belagod at gcc dot gnu.org
  Target Milestone: ---

I built my trunk and 7.10 gdb configured as:

$ configure --disable-nls --disable-sim --disable-gas --disable-binutils
--disable-ld --disable-gprof --with-libexpat --with-lzma=no
--with-python=yes --prefix=/tmp/val/build-gdb/native/7.10/install/
--with-gdb-datadir=/tmp/val/build-gdb/native/7.10/install/share/gdb

on x86_64 Ubuntu 14.04

I'm trying to debug a program with gdbserver and gdb.

For trunk gdb,

In one terminal on host:

$ gdbserver localhost:3334 ./a.out
Process ./a.out created; pid = 17642
Listening on port 3334


Another terminal:

$ ../build-gdb/native/trunk/install/bin/gdb -x gdb_simple.py ./a.out
GNU gdb (GDB) 8.0.50.20170630-git
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./a.out...done.
(gdb) Reading /lib64/ld-linux-x86-64.so.2 from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot"
to access files locally instead.
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
Reading /lib64/ld-2.19.so from remote target...
warning: the debug information found in "target:/lib64/ld-2.19.so" does
not match "target:/lib64/ld-linux-x86-64.so.2" (CRC mismatch).


Reading /lib64/.debug/ld-2.19.so from remote target...
0x00007ffff7ddb2d0 in ?? () from target:/lib64/ld-linux-x86-64.so.2
Step returned: ''
0x00007ffff7ddb2d3 in ?? () from target:/lib64/ld-linux-x86-64.so.2

<It stops here hanging>

For gdb 7.10:

$ gdbserver localhost:3334 ./a.out
Process ./a.out created; pid = 17642
Listening on port 3334

$ ../build-gdb/native/7.10/install/bin/gdb -x gdb_simple.py ./a.out
GNU gdb (GDB) 7.10.1.20160210-cvs
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./a.out...done.
(gdb) Reading /lib64/ld-linux-x86-64.so.2 from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot"
to access files locally instead.
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
Reading /lib64/ld-2.19.so from remote target...
warning: the debug information found in "target:/lib64/ld-2.19.so" does
not match "target:/lib64/ld-linux-x86-64.so.2" (CRC mismatch).


Reading /lib64/.debug/ld-2.19.so from remote target...
0x00007ffff7ddb2d0 in ?? () from target:/lib64/ld-linux-x86-64.so.2
Step returned: '0x00007ffff7ddb2d3 in ?? () from
target:/lib64/ld-linux-x86-64.so.2
'
Step returned: '0x00007ffff7ddea40 in ?? () from
target:/lib64/ld-linux-x86-64.so.2
'
Step returned: '0x00007ffff7ddea41 in ?? () from
target:/lib64/ld-linux-x86-64.so.2
'
Step returned: '0x00007ffff7ddea44 in ?? () from
target:/lib64/ld-linux-x86-64.so.2
'
Step returned: '0x00007ffff7ddea46 in ?? () from
target:/lib64/ld-linux-x86-64.so.2
'
Stepping successful

Where gdb_simple.py is
https://bugs.launchpad.net/gcc-arm-embedded/+bug/1700595/+attachment/4903671/+files/gdb_script_simple.py

and a.out is a hello world compiled using 'gcc -g hello.c'

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