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From: "vimacs.hacks at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/29787] New: Using "set debug infrun on" and "set logging
 enabled" breaks GDB prompt and makes GDB crash
Date: Wed, 16 Nov 2022 03:53:14 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: HEAD
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: vimacs.hacks at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29787

            Bug ID: 29787
           Summary: Using "set debug infrun on" and "set logging enabled"
                    breaks GDB prompt and makes GDB crash
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: vimacs.hacks at gmail dot com
  Target Milestone: ---

The use of readline in GDB is broken in commit
a715464cd2e25c8bf46190cc8bde9267c9ab6ac0 when using "set debug infrun on" a=
nd
"set logging enabled".

GDB 12.1 doesn't have this bug, but GDB 12.1 doesn't have paging for the de=
bug
messages, so I don't know if this bug is only in the versions after GDB 12.=
1.

Steps to produce this bug:

1. build a simple program:

$ cat main.c=20
int main()
{
}
$ gcc -g -O0 main.c

2. debug it and use the following commands:

$ ./gdb/gdb ./a.out
(gdb) b main
Breakpoint 1 at 0x1122: file main.c, line 3.
(gdb) set debug infrun on=20
(gdb) set logging enabled=20
Copying output to gdb.txt.
Copying debug output to gdb.txt.
(gdb) r

3. just type <RET> until the debug message finishes, and type <RET> once mo=
re,
GDB will crash with "readline: readline_callback_read_char() called with no
handler!"

--=20
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