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From: "qwertytmp1 at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/28717] GDB steps twice on a single stepi
Date: Tue, 21 Dec 2021 11:07:00 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28717

--- Comment #2 from lol lol <qwertytmp1 at gmail dot com> ---
Hello,

> Can you provide an example program where this happens?

Company, I'm working on, uses custom GDB server software.
That is why, unfortunately, I cannot share the source code of the gdbserver.
Fortunately, I can share commands to/from such custom GDB server:
```
GDBSRV RECEIVED: 'm1e2f8,4'
GDBSRV SENT: '$5f2403d5#fd'
GDBSRV RECEIVED: 'vCont?'
GDBSRV SENT: '$vCont;c;C;s;S#62'
GDBSRV RECEIVED: 'vCont;s:1;c'
GDBSRV SENT: '$T05watch:1e;#db'
GDBSRV RECEIVED: 'g'
GDBSRV SENT: '$010**a09f0* 30*%9f0* 30*}0*}0*}0*}0*_e09e0*
30*"0fce2010*.a*}a*}a*}a*}a*}a*}a*}a*}a*}a*}a*b#b4'
GDBSRV RECEIVED: 'm1e2fc,4'
GDBSRV SENT: '$ff0301d1#25'
GDBSRV RECEIVED: 'vCont;s:1'
GDBSRV SENT: '$T05watch:1e;#db'
GDBSRV RECEIVED: 'g'
GDBSRV SENT: '$010**a09f0* 30*%9f0* 30*}0*}0*}0*}0*_a09e0*
30*%e3010*.a*}a*}a*}a*}a*}a*}a*}a*}a*}a*}a*b#bb'
GDBSRV RECEIVED: 'm1e300,4'
GDBSRV SENT: '$fd7b02a9#5f'
GDBSRV RECEIVED: 'm1e2fc,4'
GDBSRV SENT: '$ff0301d1#25'
GDBSRV RECEIVED: 'm1e300,4'
GDBSRV SENT: '$fd7b02a9#5f'
GDBSRV RECEIVED: 'qfThreadInfo'
GDBSRV SENT: '$m1#9e'
GDBSRV RECEIVED: 'qsThreadInfo'
GDBSRV SENT: '$l#6c'
GDBSRV RECEIVED: 'm1e300,4'
GDBSRV SENT: '$fd7b02a9#5f'
GDBSRV RECEIVED: 'm1e2fc,4'
GDBSRV SENT: '$ff0301d1#25'
GDBSRV RECEIVED: 'm1e300,4'
GDBSRV SENT: '$fd7b02a9#5f'
```

I hope it will help to understand the problem.



> Can you try to reproduce this with a GDBserver debugging a Linux program?=
  That would help us figure out what happens.

I was failed to reproduce the problem with Linux application.
GDB client works without problems.


I've compared commands received/sent by the GDB client for the native AARCH=
64
application and Linux AARCH64 application.
Below you can see the difference:
```
If to debug NATIVE application | If to debug LINUX application
                                                           |=20
(gdb) si                       | (gdb) si
PUTPKT: 'm1e2f8,4'             | PUTPKT: 'Z0,7ff7ed2504,4'
GETPKT: 'm1e2f8,4'             | GETPKT: 'Z0,7ff7ed2504,4'
PUTPKT: 'vCont?'               | PUTPKT: 'm7ff7ed2508,4'
GETPKT: 'vCont?'               | GETPKT: 'm7ff7ed2508,4'
PUTPKT: 'vCont;s:1;c'          | GETPKT: 'e0030091'
PUTPKT: 'g'                    | PUTPKT: 'vCont?'
GETPKT: 'g'                    | GETPKT: 'vCont?'
PUTPKT: 'm1e2fc,4'             | PUTPKT: 'vCont;s:p77.77;c:p77.-1'
GETPKT: 'm1e2fc,4'             | PUTPKT: 'm7ff7ed250c,4'
PUTPKT: 'vCont;s:1'            | GETPKT: 'm7ff7ed250c,4'
PUTPKT: 'g'                    | PUTPKT: 'm7ff7ed2508,4'
GETPKT: 'g'                    | GETPKT: 'm7ff7ed2508,4'
PUTPKT: 'm1e300,4'             | PUTPKT: 'm7ff7ed250c,4'
GETPKT: 'm1e300,4'             | GETPKT: 'm7ff7ed250c,4'
PUTPKT: 'm1e2fc,4'             | PUTPKT: 'qXfer:threads:read::0,1000'
GETPKT: 'm1e2fc,4'             | PUTPKT: 'z0,7ff7ed2504,4'
PUTPKT: 'm1e300,4'             | GETPKT: 'z0,7ff7ed2504,4'
GETPKT: 'm1e300,4'             | PUTPKT: 'm7ff7ed250c,4'
GETPKT: 'fd7b02a9'             | GETPKT: 'm7ff7ed250c,4'
GETPKT: 'm1'                   | PUTPKT: 'm7ff7ed2508,4'
PUTPKT: 'm1e300,4'             | GETPKT: 'm7ff7ed2508,4'
GETPKT: 'm1e300,4'             | PUTPKT: 'm7ff7ed250c,4'
PUTPKT: 'm1e2fc,4'             | GETPKT: 'm7ff7ed250c,4'
GETPKT: 'm1e2fc,4'             |=20
PUTPKT: 'm1e300,4'             |=20
GETPKT: 'm1e300,4'             |=20

```

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