Thanks Mark.

This reason of this issue is because we want close the old record
target with record_close that will be called by "push_target
(&record_ops);"
This line is after "Set the beneath function pointers."

So it make "record_beneath_to_insert_breakpoint" point to the record_insert_xxx.

In 2 months before, I post a patch that change this query to error.  I
post it again, wish you like it.

Thanks,
Hui

2009-09-12  Hui Zhu  <teawater@gmail.com>

	* record.c (record_open): Change "query" to "error".
	(cmd_record_stop): Change "query" to "printf_unfiltered".

---
 record.c |   14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

--- a/record.c
+++ b/record.c
@@ -436,12 +436,8 @@ record_open (char *name, int from_tty)

   /* Check if record target is already running.  */
   if (current_target.to_stratum == record_stratum)
-    {
-      if (!nquery
-	  (_("Process record target already running, do you want to delete "
-	     "the old record log?")))
-	return;
-    }
+    error (_("Process record target already running.  Use \"record stop\" to "
+	     "stop record target first."));

   /*Reset the beneath function pointers.  */
   record_beneath_to_resume = NULL;
@@ -1157,9 +1153,9 @@ cmd_record_stop (char *args, int from_tt
 {
   if (current_target.to_stratum == record_stratum)
     {
-      if (!record_list || !from_tty || query (_("Delete recorded log and "
-	                                        "stop recording?")))
-	unpush_target (&record_ops);
+      unpush_target (&record_ops);
+      printf_unfiltered (_("Process record is stoped and all execution "
+                           "log is deleted.\n"));
     }
   else
     printf_unfiltered (_("Process record is not started.\n"));


On Fri, Sep 11, 2009 at 22:24, Marc Khouzam <marc.khouzam@ericsson.com> wrote:
> Hi Hui,
>
> I see a Segmentation fault when enabling Record when it is already on.
>
> GNU gdb (GDB) 6.8.50.20090910-cvs
> Copyright (C) 2009 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 "i686-pc-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /local/lmckhou/testing/a.out...done.
> (gdb) l
> 1       int main()
> 2       {
> 3         int a = 0;
> 4         int b = 1;
> 5         return 0;
> 6       }
> (gdb) start
> Temporary breakpoint 1 at 0x8048415: file a.cc, line 3.
> Starting program: /local/lmckhou/testing/a.out
>
> Temporary breakpoint 1, main () at a.cc:3
> 3         int a = 0;
> (gdb) record
> (gdb) record
> Process record target already running, do you want to delete the old record log?(y or [n]) y
> (gdb) n
> Segmentation fault
>
> Here is the backtrace:
> (gdb) bt
> #0  0xb7d2e449 in _int_malloc () from /lib/libc.so.6
> #1  0xb7d2fce6 in malloc () from /lib/libc.so.6
> #2  0x0808f564 in xmalloc (size=16) at ../../src/gdb/utils.c:1229
> #3  0x0808e585 in make_my_cleanup2 (pmy_chain=0x84003e0, function=0x808e50b <restore_integer>, arg=0x8d0cf50, free_arg=0x808f63b <xfree>)
>    at ../../src/gdb/utils.c:349
> #4  0x0808e571 in make_cleanup_restore_integer (variable=0x8413190) at ../../src/gdb/utils.c:340
> #5  0x0822724e in record_gdb_operation_disable_set () at ../../src/gdb/record.c:414
> #6  0x082283aa in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1081
> #7  0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #8  0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #9  0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #10 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #11 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #12 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> #13 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
> ...
>
> This continues over and over and over ....
>
> Thanks
>
>