Re: How to catch GDB crash

[Dmitry Smirnov <divis1969 at mail dot ru>]

I still have some doubts :-)

Below is a new log of my debug session. I've set the same mi_execute_command and mi_on_resume. Last one prints the value of 'inferior_ptid' when hit. Also, from Eclipse I've issues command 'ni' before 'c'. As you can see, 'inferior_ptid' it is equal to {pid = 42000, lwp = 0, tid = 0} all the time whereas mi_on_resume is called with {pid = -1, lwp = 0, tid = 0} in all cases except last one.

On my mind it indicates that while executing last 'ni', function resume() in file infrun.c goes different way and it assigned 'inferior_ptid' to 'resume_ptid' instead of default RESUME_ALL.

Digging...

Dmitry

GNU gdb 6.3.50_2004-12-28-cvs (cygwin-special)
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This GDB was configured as "i686-pc-cygwin".
(gdb) attach 2348
Attaching to process 2348
Reading symbols from /cygdrive/d/Install/GDB/gdb-6.8.50.20080620/gdb-6.8.50.2008
0620/gdb/gdb.exe...done.
[Switching to thread 2348.0x15bc]
(gdb) info b
No breakpoints or watchpoints.
(gdb) b mi_on_resume
Breakpoint 1 at 0x48cf46: file .././gdb/mi/mi-interp.c, line 335.
(gdb) b mi_execute_command
Breakpoint 2 at 0x505537: file .././gdb/mi/mi-main.c, line 1135.
(gdb) commands 1
Type commands for when breakpoint 1 is hit, one per line.
End with a line saying just "end".
>print inferior_ptid
>c
>end
(gdb) commands 2
Type commands for when breakpoint 2 is hit, one per line.
End with a line saying just "end".
>c
>end
(gdb) ni
0x7c9507a8 in ntdll!KiIntSystemCall () from /c/WINDOWS/system32/ntdll.dll
(gdb)
0x7c9507bb in ntdll!KiIntSystemCall () from /c/WINDOWS/system32/ntdll.dll
(gdb)
0x7c9507bf in ntdll!KiIntSystemCall () from /c/WINDOWS/system32/ntdll.dll
(gdb)
0x7c9507c1 in ntdll!KiIntSystemCall () from /c/WINDOWS/system32/ntdll.dll
(gdb)
[Switching to thread 2348.0x740]

Breakpoint 2, mi_execute_command (cmd=0x138f74a0 "303 ni", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 1, mi_on_resume (ptid={pid = -1, lwp = 0, tid = 0})
    at .././gdb/mi/mi-interp.c:335
335       if (PIDGET (ptid) == -1)
$1 = {pid = 42000, lwp = 0, tid = 0}

Breakpoint 2, mi_execute_command (cmd=0x1393df78 "304 info threads",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x1393dfd0 "305-stack-info-depth",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x1395a678 "306-stack-list-frames 0 1",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x1395a6d0 "307-data-list-changed-registers", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x13962898 "308 info sharedlibrary",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x139628f0 "309-stack-list-arguments 0 0 0", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x13927738 "310-stack-list-locals 0",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x13927790 "311-interpreter-exec console \"info b\"", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x13977ce8 "312 c", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 1, mi_on_resume (ptid={pid = -1, lwp = 0, tid = 0})
    at .././gdb/mi/mi-interp.c:335
335       if (PIDGET (ptid) == -1)
$2 = {pid = 42000, lwp = 0, tid = 0}

Breakpoint 2, mi_execute_command (cmd=0x13974bd8 "313 info threads",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x13980e98 "314-stack-info-depth",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x14770128 "315-stack-list-frames 0 11", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x14770010 "316-data-list-changed-registers", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x10ef8958 "317 info sharedlibrary",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x10ef89b0 "318-data-disassemble -f /c/p4/views/KSW_S4000_WP_DEV_unknown
/qct/drivers/parb/parb.c -l 333 -n 100 -- 1", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x1476fe18 "319-data-disassemble -s 0x8c4a8e -e 0x8c4af2 -- 0",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x1172a8d0 "320-stack-list-arguments 0 0 0", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x11738a00 "321-stack-list-locals 0",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x1174b920 "322 whatis i", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x11758f10 "323 whatis rt_status",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x11761360 "324 whatis __result",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x11761548 "325-var-create - * i",
    from_tty=1) at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x117616e8 "326-var-evaluate-expression var1", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x117c3978 "327-var-create - * rt_status", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x11785568 "328-var-evaluate-expression var2", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x1178b4b8 "329-var-create - * __result", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (
    cmd=0x1178b550 "330-var-evaluate-expression var3", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 2, mi_execute_command (cmd=0x11795130 "331 ni", from_tty=1)
    at .././gdb/mi/mi-main.c:1135
1135    {

Breakpoint 1, mi_on_resume (ptid={pid = 42000, lwp = 0, tid = 0})
    at .././gdb/mi/mi-interp.c:335
335       if (PIDGET (ptid) == -1)
$3 = {pid = 42000, lwp = 0, tid = 0}

Program exited with code 037777777777.
(gdb)