[Bug gdb/17785] GDB ignores "disable-randomization" setting once its set to off once

["xdje42 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17785

Doug Evans <xdje42 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |xdje42 at gmail dot com

--- Comment #1 from Doug Evans <xdje42 at gmail dot com> ---
Repro instructions please.
Looking at the code (linux_nat_create_inferior) I see it doesn't protect itself
from an error thrown by to_create_inferior.  Maybe to_create_inferior can't
throw an error (in which case no protection is needed) but that'd be a bit
fragile.  OTOH, even if personality didn't get restored, the next time through
should turn on ADDR_NO_RANDOMIZE if disable_randomization is set.

Thus it's hard reason about this bug without reproduction instructions.
Got repro?

I tried the following, and could not reproduce the problem:

bash$ gdb hello.x64
...
(gdb) set confirm off
(gdb) show disable
Disabling randomization of debuggee's virtual address space is on.
(gdb) start
Temporary breakpoint 1 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 1, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$1 = (void *) 0x7fffffffe1c0
(gdb) start
Temporary breakpoint 2 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 2, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$2 = (void *) 0x7fffffffe1c0
(gdb) set disable off
(gdb) start
Temporary breakpoint 3 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 3, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$3 = (void *) 0x7fffe7de8020
(gdb) start
Temporary breakpoint 4 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 4, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$4 = (void *) 0x7fff2fbd7fe0
(gdb) set disable on
(gdb) start
Temporary breakpoint 5 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 5, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$5 = (void *) 0x7fffffffe1c0
(gdb) start
Temporary breakpoint 6 at 0x400764: file hello.cc, line 6.
Starting program: /home/dje/hello.x64

Temporary breakpoint 6, main () at hello.cc:6
6         std::cout << "hello\n";
(gdb) p $rsp
$6 = (void *) 0x7fffffffe1c0
(gdb)

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