[Bug breakpoints/16551] New: Execution stops when encountering a dprintf with an invalid string

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16551

            Bug ID: 16551
           Summary: Execution stops when encountering a dprintf with an
                    invalid string
           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

I define a dprintf that has an error in its printout function (as the user may
do this by mistake).  When the dprintf is hit, an error printout is output and
the execution stops.  However, no *stopped event is issued.

This missing *stopped event is not good, but I think the problem to fix is that
the execution should not stop in this case.  If a user sets a dprintf, she
expects the execution to continue and there may be negative consequence at
suddenly stopping the execution.

Addressing bug 15185 would probably fix this.

Here is a stripped session that shows how to reproduce:

> gdb -i mi loopfirst
=thread-group-added,id="i1"
~"GNU gdb (GDB) 7.7\n"
~"Reading symbols from loopfirst..."
~"done.\n"
(gdb) 
dprintf 5,"%d\n",badvariable
(gdb) 
i b
&"i b\n"
~"Num     Type           Disp Enb Address            What\n"
~"1       dprintf        keep y   0x000000000040054c in main() at
loopfirst.cc:5\n"
~"        printf \"%d\\n\",badvariable\n"
^done
(gdb) 
22-exec-run
=thread-group-started,id="i1",pid="13398"
=thread-created,id="1",group-id="i1"
22^running
*running,thread-id="all"
(gdb)
22^error,msg="No symbol \"badvariable\" in current context."
(gdb)
i thre
&"i thre\n"
~"  Id   Target Id         Frame \n"
~"* 1    process 13398 \"loopfirst\" main () at loopfirst.cc:5\n"
^done

=== Notice that the thread is stopped although we did an -exec-run ==

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