[Bug breakpoints/15956] New: gdbserver crash when doing tstart with no process

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

http://sourceware.org/bugzilla/show_bug.cgi?id=15956

            Bug ID: 15956
           Summary: gdbserver crash when doing tstart with no process
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: minor
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: marc.khouzam at ericsson dot com

Using the extended-remote protocol, I did a 'tstart' but had forgotten to
attach to the process first: gdbserver crashed.  I realize I did something
wrong, but a crash is not good :)

gdb session:
> gdb.7.7 testapp
GNU gdb (GDB) 7.6.50.20130910-cvs
[...]
Reading symbols from testapp...done.
(gdb) target extended-remote :9999
Remote debugging using :9999
(gdb) trace main
Tracepoint 1 at 0x400ec6: file testapp.cc, line 182.
(gdb) inf inf
  Num  Description       Executable        
* 1    <null>            /home/lmckhou/testapp 
(gdb) tstart

=> here gdbserver crashes

Backtrace of the gdbserver:
#0  0x000000000040672b in inferior_target_data (inferior=0x0) at
../../../gdb/gdbserver/inferiors.c:211
#1  0x000000000042e058 in linux_read_memory (memaddr=0, myaddr=0x7fffffffdf80
"\300\337\377\377\377\177", len=8)
    at ../../../gdb/gdbserver/linux-low.c:4416
#2  0x00000000004136a5 in read_inferior_memory (memaddr=0,
myaddr=0x7fffffffdf80 "\300\337\377\377\377\177", len=8)
    at ../../../gdb/gdbserver/target.c:46
#3  0x0000000000419665 in read_inferior_data_pointer (symaddr=0,
val=0x7fffffffdfc0) at ../../../gdb/gdbserver/tracepoint.c:444
#4  0x0000000000419aa2 in clear_inferior_trace_buffer () at
../../../gdb/gdbserver/tracepoint.c:1463
#5  0x000000000041b14c in cmd_qtinit (packet=0x6633d0 "QTinit") at
../../../gdb/gdbserver/tracepoint.c:2404
#6  0x000000000041ed29 in handle_tracepoint_general_set (packet=0x6633d0
"QTinit") at ../../../gdb/gdbserver/tracepoint.c:4142
#7  0x000000000040bcfd in handle_general_set (own_buf=0x6633d0 "QTinit") at
../../../gdb/gdbserver/server.c:612
#8  0x0000000000411c31 in process_serial_event () at
../../../gdb/gdbserver/server.c:3184
#9  0x0000000000412d09 in handle_serial_event (err=0, client_data=0x0) at
../../../gdb/gdbserver/server.c:3619
#10 0x0000000000418c8f in handle_file_event (event_file_desc=4) at
../../../gdb/gdbserver/event-loop.c:434
#11 0x000000000041841c in process_event () at
../../../gdb/gdbserver/event-loop.c:189
#12 0x0000000000419200 in start_event_loop () at
../../../gdb/gdbserver/event-loop.c:552
#13 0x00000000004115f1 in main (argc=3, argv=0x7fffffffe408) at
../../../gdb/gdbserver/server.c:2986

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