Re: GDB on AIX

On Mon, Nov 14, 2016 at 05:18:31PM +0000, Pedro Alves wrote:
> On 11/14/2016 03:51 PM, Yao Qi wrote:
> > Hi David and Sergio,
> >
> > GDB mainline is broken on aix (gcc119.fsffrance.org),
>
>
> > (gdb) kill
> > terminate called after throwing an instance of 'gdb_exception_RETURN_MASK_ERROR'
> > IOT/Abort trap (core dumped)
>
> If you debug gdb and put a breakpoint on throw_it, what does the
> backtrace look like?  Would be exception be crossing
> some C library that doesn't understand C++ exceptions,
> other than readline?
>

I don't see any C library other than readline,

(top-gdb) bt
#0  _ZL8throw_it13return_reason6errorsPKcPc (reason=1, error=538192296,
    fmt=0x105cebcc <_GLOBAL__F_inferior_ptid+5836> "The program is not
being run.", ap=0x2ff2253c "/Ã")
    at ../../binutils-gdb/gdb/common/common-exceptions.c:345
#1  0x10031390 in _Z12throw_verror6errorsPKcPc (error=4294967295, fmt=0x1 "",
    ap=0x105cebcc <_GLOBAL__F_inferior_ptid+5836> "The program is not
being run.") at ../../binutils-gdb/gdb/common/common-exceptions.c:379
#2  0x1000f940 in _Z6verrorPKcPc (string=0xffffffff <error: Cannot
access memory at address 0xffffffff>, args=0x1 "")
    at ../../binutils-gdb/gdb/utils.c:477
#3  0x1002e6a4 in _Z5errorPKcz (fmt=0xffffffff <error: Cannot access
memory at address 0xffffffff>) at
../../binutils-gdb/gdb/common/errors.c:43
#4  0x100d9170 in _ZL12kill_commandPci (arg=0xffffffff <error: Cannot
access memory at address 0xffffffff>, from_tty=1)
    at ../../binutils-gdb/gdb/infcmd.c:2578
#5  0x1008b5c8 in _ZL8do_cfuncP16cmd_list_elementPci (c=0xffffffff,
args=0x1 "", from_tty=274525132) at
../../binutils-gdb/gdb/cli/cli-decode.c:105
#6  0x1008f478 in _Z8cmd_funcP16cmd_list_elementPci (cmd=0x20111d78,
args=0x0, from_tty=1) at ../../binutils-gdb/gdb/cli/cli-decode.c:1913
#7  0x10061298 in _Z15execute_commandPci (p=0x200a9798 "kill",
from_tty=1) at ../../binutils-gdb/gdb/top.c:80
#8  0x1002fed4 in _Z15command_handlerPc (command=0x200a9798 "kill") at
../../binutils-gdb/gdb/event-top.c:577
#9  0x1003033c in _Z20command_line_handlerPc (rl=0xffffffff <error:
Cannot access memory at address 0xffffffff>)
    at ../../binutils-gdb/gdb/event-top.c:25
#10 0x1002ea40 in _ZL23gdb_rl_callback_handlerPc (rl=0x200a99a8
"kill") at ../../binutils-gdb/gdb/event-top.c:200
#11 0x100320a8 in rl_callback_read_char () at
../../binutils-gdb/readline/callback.c:220
#12 0x1002e8f0 in _ZL33gdb_rl_callback_read_char_wrapperPv
(client_data=0xffffffff) at ../../binutils-gdb/gdb/event-top.c:173
#13 0x1002f540 in _Z19stdin_event_handleriPv (error=-1,
client_data=0x200a97a8) at ../../binutils-gdb/gdb/event-top.c:505
#14 0x102af9a8 in _ZL17handle_file_eventP12file_handleri
(file_ptr=0x20142908, ready_mask=1) at
../../binutils-gdb/gdb/event-loop.c:733
#15 0x102b012c in _ZL18gdb_wait_for_eventi (block=-1) at
../../binutils-gdb/gdb/event-loop.c:859
#16 0x102b0440 in _Z16gdb_do_one_eventv.part.2 () at
../../binutils-gdb/gdb/event-loop.c:347
#17 0x102b06a0 in _Z16start_event_loopv () at
../../binutils-gdb/gdb/common/common-exceptions.h:221
#18 0x10000414 in _ZL21captured_command_loopPv (data=0xffffffff) at
../../binutils-gdb/gdb/main.c:325
#19 0x102aaf34 in _Z12catch_errorsPFiPvES_Pc11return_mask
(func=@0x200643ac: 0x100003d4 <_ZL21captured_command_loopPv>,
func_args=0x0,
    errstring=0x105963d4 <_GLOBAL__F_interpreter_p+980> "",
mask=RETURN_MASK_ALL) at ../../binutils-gdb/gdb/exceptions.c:236
#20 0x10001988 in _Z8gdb_mainP18captured_main_args (args=0x0) at
../../binutils-gdb/gdb/main.c:2302
#21 0x100003a4 in main (argc=-1, argv=<incomplete type>) at
../../binutils-gdb/gdb/gdb.c:32

If I "continue", I get the followings,

(top-gdb) bt
#0  0xd057a02c in pthread_kill () from /usr/lib/libpthreads.a(shr_xpg5.o)
#1  0xd057940c in _p_raise () from /usr/lib/libpthreads.a(shr_xpg5.o)
#2  0xd0123348 in raise () from /usr/lib/libc.a(shr.o)
#3  0xd018991c in abort () from /usr/lib/libc.a(shr.o)
#4  0x1001986c in uw_init_context_1 (context=0x2ff216e8,
outer_cfa=0x2ff21ae0, outer_ra=0x1001ac80
<_Unwind_Resume_or_Rethrow+212>)
    at ../../../gcc-6.1.0/libgcc/unwind-dw2.c:13
#5  0x1001a520 in _Unwind_RaiseException (exc=0x20147f78) at
../../../gcc-6.1.0/libgcc/unwind.inc:88
#6  0x1001ac80 in _Unwind_Resume_or_Rethrow (exc=0x20147f78) at
../../../gcc-6.1.0/libgcc/unwind.inc:252
#7  0x1002a138 in __cxa_rethrow () at  _start_ :118
#8  0x1001d410 in __gnu_cxx::__verbose_terminate_handler () at
../../../../gcc-6.1.0/libstdc++-v3/libsupc++/vterminate.cc:80
#9  0x1002a568 in __cxxabiv1::__terminate (handler=<incomplete type>)
at ../../../../gcc-6.1.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
#10 0x1001d2c8 in std::terminate () at  _start_ :57
#11 0x1002a8d8 in __cxa_throw (obj=<error reading variable>,
tinfo=<error reading variable>, dest=<error reading variable>) at
_start_ :87
#12 0x10030d40 in _ZL19throw_exception_cxx13gdb_exception
(exception=...) at
../../binutils-gdb/gdb/common/common-exceptions.c:16
#13 0x10030e48 in _ZL8throw_it13return_reason6errorsPKcPc
(reason=RETURN_ERROR, error=GENERIC_ERROR,
    fmt=0xffffffff <error: Cannot access memory at address
0xffffffff>, ap=0xffffffff <error: Cannot access memory at address
0xffffffff>)
    at ../../binutils-gdb/gdb/common/common-exceptions.c:317
#14 0x10031390 in _Z12throw_verror6errorsPKcPc (error=GDB_NO_ERROR,
fmt=0xffffffff <error: Cannot access memory at address 0xffffffff>,
    ap=0xffffffff <error: Cannot access memory at address 0xffffffff>)
at ../../binutils-gdb/gdb/common/common-exceptions.c:379
#15 0x1000f940 in _Z6verrorPKcPc (string=0x0, args=0xffffffff <error:
Cannot access memory at address 0xffffffff>)
    at ../../binutils-gdb/gdb/utils.c:477
#16 0x1002e6a4 in _Z5errorPKcz (fmt=0x0) at
../../binutils-gdb/gdb/common/errors.c:43
#17 0x100d90f0 in _ZL12kill_commandPci (arg=0x0, from_tty=-1) at
../../binutils-gdb/gdb/infcmd.c:2578
#18 0x1008b548 in _ZL8do_cfuncP16cmd_list_elementPci (c=0x0,
args=0xffffffff <error: Cannot access memory at address 0xffffffff>,
from_tty=-1)
    at ../../binutils-gdb/gdb/cli/cli-decode.c:105
#19 0x1008f3f8 in _Z8cmd_funcP16cmd_list_elementPci (cmd=0x20112988,
args=0x0, from_tty=1) at ../../binutils-gdb/gdb/cli/cli-decode.c:1913
#20 0x10061218 in _Z15execute_commandPci (p=0x200aa3a8 "kill",
from_tty=1) at ../../binutils-gdb/gdb/top.c:80
#21 0x1002fed4 in _Z15command_handlerPc (command=0x200aa3a8 "kill") at
../../binutils-gdb/gdb/event-top.c:577
#22 0x1003033c in _Z20command_line_handlerPc (rl=0x0) at
../../binutils-gdb/gdb/event-top.c:25
#23 0x1002ea40 in _ZL23gdb_rl_callback_handlerPc (rl=0x200aa5b8
"kill") at ../../binutils-gdb/gdb/event-top.c:200
#24 0x100320a8 in rl_callback_read_char () at
../../binutils-gdb/readline/callback.c:220
#25 0x1002e8f0 in _ZL33gdb_rl_callback_read_char_wrapperPv
(client_data=0x0) at ../../binutils-gdb/gdb/event-top.c:173
#26 0x1002f540 in _Z19stdin_event_handleriPv (error=0,
client_data=0x200aa3b8) at ../../binutils-gdb/gdb/event-top.c:505
#27 0x102af928 in _ZL17handle_file_eventP12file_handleri
(file_ptr=0x20143518, ready_mask=1) at
../../binutils-gdb/gdb/event-loop.c:733
#28 0x102b00ac in _ZL18gdb_wait_for_eventi (block=-1) at
../../binutils-gdb/gdb/event-loop.c:859
---Type <return> to continue, or q <return> to quit---
#29 0x102b03c0 in _Z16gdb_do_one_eventv.part.2 () at
../../binutils-gdb/gdb/event-loop.c:347
#30 0x102b0620 in _Z16start_event_loopv () at
../../binutils-gdb/gdb/common/common-exceptions.h:221
#31 0x10000414 in _ZL21captured_command_loopPv (data=0x0) at
../../binutils-gdb/gdb/main.c:325
#32 0x102aaeb4 in _Z12catch_errorsPFiPvES_Pc11return_mask
(func=@0x20064fc0: 0x100003d4 <_ZL21captured_command_loopPv>,
func_args=0x0,
    errstring=0x10596354 <_GLOBAL__F_interpreter_p+980> "",
mask=RETURN_MASK_ALL) at ../../binutils-gdb/gdb/exceptions.c:236
#33 0x10001988 in _Z8gdb_mainP18captured_main_args (args=0x0) at
../../binutils-gdb/gdb/main.c:2302
#34 0x100003a4 in main (argc=0, argv=<incomplete type>) at
../../binutils-gdb/gdb/gdb.c:32

I don't check the code carefully yet, will do it tomorrow.

-- 
Yao