core dump when watchpoint set

Joel Sherrill joel.sherrill@oarcorp.com
Tue Sep 9 14:57:00 GMT 2008


Hi,

I wondered if this looked familiar and was fixed in
CVS.  I am using gdb 6.8 targeting powerpc and running
the application using psim.  When I set a watchpoint
and then run, gdb core dumps.

If this isn't a known issue, can someone point me in
the direction of what to look at so I can fix it?


(gdb) watch _Thread_Executing
Watchpoint 5: _Thread_Executing
(gdb) info watchpoints
Num     Type           Disp Enb Address    What
1       breakpoint     keep y   0x000091bc in _Internal_error_Occurred 
at ../../../../../../current/c/src/../../cpukit/score/src/interr.c:53
2       breakpoint     keep y   0x0000856c in rtems_fatal_error_occurred 
at ../../../../../../current/c/src/../../cpukit/sapi/src/fatal.c:38
3       breakpoint     keep y   0x0000d9dc in __assert at 
../../../../../../current/c/src/../../cpukit/libcsupport/src/__assert.c:48
4       breakpoint     keep y   0x00001fdc in C_exception_handler
                                       at 
../../../../../../../current/c/src/lib/libcpu/powerpc/new-exceptions/bspsupport/vectors_init.c:119
5       watchpoint     keep y              _Thread_Executing
(gdb) r
Starting program: /home/joel/rtems-4.9-work/build/test/minimum.ralf

Program received signal SIGSEGV, Segmentation fault.
value_type (value=0x0) at ../../gdb-6.8/gdb/value.c:269
269     {
Missing separate debuginfos, use: debuginfo-install expat.i386 
glibc.i686 ncurses.i386 readline.i386
(gdb) bt
#0  value_type (value=0x0) at ../../gdb-6.8/gdb/value.c:269
#1  0x080ca752 in coerce_array (arg=0x0) at ../../gdb-6.8/gdb/value.c:1677
#2  0x080d6cf7 in value_equal (arg1=0x0, arg2=0xa23ecc8) at 
../../gdb-6.8/gdb/valarith.c:1603
#3  0x080bdf7e in watchpoint_check (p=0xa1e3568) at 
../../gdb-6.8/gdb/breakpoint.c:2578
#4  0x080fd9e3 in catch_errors (func=0x80bde40 <watchpoint_check>, 
func_args=0xa1e3568,
    errstring=0xa23eb20 "Error evaluating expression for watchpoint 
5\n", mask=6)
    at ../../gdb-6.8/gdb/exceptions.c:513
#5  0x080bf262 in bpstat_stop_status (bp_addr=376, ptid={pid = 42, lwp = 
0, tid = 0})
    at ../../gdb-6.8/gdb/breakpoint.c:2790
#6  0x080f3cb9 in handle_inferior_event (ecs=0xbf8436b4) at 
../../gdb-6.8/gdb/infrun.c:1980
#7  0x080f5de7 in wait_for_inferior (treat_exec_as_sigtrap=0) at 
../../gdb-6.8/gdb/infrun.c:1042
#8  0x080f5fb4 in proceed (addr=4294967295, siggnal=TARGET_SIGNAL_0, 
step=0) at ../../gdb-6.8/gdb/infrun.c:844
#9  0x080f1113 in run_command_1 (args=0x0, from_tty=1, 
tbreak_at_main=<value optimized out>)
    at ../../gdb-6.8/gdb/infcmd.c:563
#10 0x08053555 in execute_command (p=0xa0d90e1 "", from_tty=1) at 
../../gdb-6.8/gdb/top.c:449
#11 0x08100eaf in command_handler (command=0xa0d90e0 "") at 
../../gdb-6.8/gdb/event-top.c:518
#12 0x08101b47 in command_line_handler (rl=0xa1b8c10 "") at 
../../gdb-6.8/gdb/event-top.c:804
#13 0x005e5892 in rl_callback_read_char () from /lib/libreadline.so.5
#14 0x0810103b in rl_callback_read_char_wrapper (client_data=0x0) at 
../../gdb-6.8/gdb/event-top.c:177
#15 0x08100a97 in handle_file_event (event_file_desc=0) at 
../../gdb-6.8/gdb/event-loop.c:728
#16 0x080fff59 in process_event () at ../../gdb-6.8/gdb/event-loop.c:341
#17 0x08100728 in gdb_do_one_event (data=0x0) at 
../../gdb-6.8/gdb/event-loop.c:378
#18 0x080fd9e3 in catch_errors (func=0x8100610 <gdb_do_one_event>, 
func_args=0x0, errstring=0x83590e8 "", mask=6)
    at ../../gdb-6.8/gdb/exceptions.c:513
#19 0x080a9e2a in tui_command_loop (data=0x0) at 
../../gdb-6.8/gdb/tui/tui-interp.c:153
#20 0x080fdfaf in current_interp_command_loop () at 
../../gdb-6.8/gdb/interps.c:276
#21 0x0804c32b in captured_command_loop (data=0x0) at 
../../gdb-6.8/gdb/main.c:99
#22 0x080fd9e3 in catch_errors (func=0x804c320 <captured_command_loop>, 
func_args=0x0, errstring=0x83590e8 "",
    mask=6) at ../../gdb-6.8/gdb/exceptions.c:513
#23 0x0804cb55 in captured_main (data=0xbf843c04) at 
../../gdb-6.8/gdb/main.c:882
#24 0x080fd9e3 in catch_errors (func=0x804c360 <captured_main>, 
func_args=0xbf843c04, errstring=0x83590e8 "",
    mask=6) at ../../gdb-6.8/gdb/exceptions.c:513
#25 0x0804c311 in gdb_main (args=0xbf843c04) at ../../gdb-6.8/gdb/main.c:891
#26 0x0804c2d5 in main (argc=Cannot access memory at address 0x1
) at ../../gdb-6.8/gdb/gdb.c:33




-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (256) 722-9985




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