[Bug breakpoints/17012] New: Detaching from process with call-style dprintf crashes the inferior

["marc.khouzam at ericsson dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17012

            Bug ID: 17012
           Summary: Detaching from process with call-style dprintf crashes
                    the inferior
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: marc.khouzam at ericsson dot com
                CC: simon.marchi at ericsson dot com

If I set a call-style dprintf on an inferior and then detach from that
inferior, the inferior crashes.  It looks like the dprintf is not removed when
detaching.

If I do this after attaching to the inferior I see this printout with it
crashes:

Trace/BPT trap (core dumped)

Below is a session starting a process, setting the call-style dprintf and then
detaching, which causes the crash:

> gdb.7.7 ~/testing/loopfirst
GNU gdb (GDB) 7.7.1
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Reading symbols from /home/lmckhou/testing/loopfirst...done.
(gdb) l
1       #include <unistd.h>
2       #include <stdio.h>
3
4       int main() {
5           int max = 900;
6           for (int i=0;i<max;i++) {
7               printf("i is %d\n",i);
8               sleep(1);
9           }
10          return 0;
(gdb) set non-stop on
(gdb) set pagination off
(gdb) set target-async on
(gdb) set dprintf-style call
(gdb) dprintf 7,"h\n"
Dprintf 1 at 0x40055c: file loopfirst.cc, line 7.
(gdb) start
Temporary breakpoint 2 at 0x40054c: file loopfirst.cc, line 5.
Starting program: /home/lmckhou/testing/loopfirst 

Temporary breakpoint 2, main () at loopfirst.cc:5
5           int max = 900;
(gdb) detach
Detaching from program: /home/lmckhou/testing/loopfirst, process 305
(gdb) shell ps -ef|grep 305
lmckhou    305 32765  0 14:15 pts/2    00:00:00 [loopfirst] <defunct>

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