Re: Record segfault

[Hui Zhu <teawater at gmail dot com>]

Hi Joel,

Sorry to disturb you.  Ping
http://sourceware.org/ml/gdb-patches/2009-09/msg00357.html

Thanks,
Hui

On Sat, Sep 12, 2009 at 10:39, Hui Zhu <teawater@gmail.com> wrote:
> Thanks Mark.
>
> This reason of this issue is because we want close the old record
> target with record_close that will be called by "push_target
> (&record_ops);"
> This line is after "Set the beneath function pointers."
>
> So it make "record_beneath_to_insert_breakpoint" point to the record_insert_xxx.
>
> In 2 months before, I post a patch that change this query to error. ÂI
> post it again, wish you like it.
>
> Thanks,
> Hui
>
> 2009-09-12 ÂHui Zhu Â<teawater@gmail.com>
>
> Â Â Â Â* record.c (record_open): Change "query" to "error".
> Â Â Â Â(cmd_record_stop): Change "query" to "printf_unfiltered".
>
> ---
> Ârecord.c | Â 14 +++++---------
> Â1 file changed, 5 insertions(+), 9 deletions(-)
>
> --- a/record.c
> +++ b/record.c
> @@ -436,12 +436,8 @@ record_open (char *name, int from_tty)
>
> Â /* Check if record target is already running. Â*/
> Â if (current_target.to_stratum == record_stratum)
> - Â Â{
> - Â Â Âif (!nquery
> - Â Â Â Â (_("Process record target already running, do you want to delete "
> - Â Â Â Â Â Â"the old record log?")))
> - Â Â Â return;
> - Â Â}
> + Â Âerror (_("Process record target already running. ÂUse \"record stop\" to "
> + Â Â Â Â Â Â"stop record target first."));
>
> Â /*Reset the beneath function pointers. Â*/
> Â record_beneath_to_resume = NULL;
> @@ -1157,9 +1153,9 @@ cmd_record_stop (char *args, int from_tt
> Â{
> Â if (current_target.to_stratum == record_stratum)
> Â Â {
> - Â Â Âif (!record_list || !from_tty || query (_("Delete recorded log and "
> - Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â "stop recording?")))
> - Â Â Â unpush_target (&record_ops);
> + Â Â Âunpush_target (&record_ops);
> + Â Â Âprintf_unfiltered (_("Process record is stoped and all execution "
> + Â Â Â Â Â Â Â Â Â Â Â Â Â "log is deleted.\n"));
> Â Â }
> Â else
> Â Â printf_unfiltered (_("Process record is not started.\n"));
>
>
> On Fri, Sep 11, 2009 at 22:24, Marc Khouzam <marc.khouzam@ericsson.com> wrote:
>> Hi Hui,
>>
>> I see a Segmentation fault when enabling Record when it is already on.
>>
>> ïGNU gdb (GDB) 6.8.50.20090910-cvs
>> Copyright (C) 2009 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law. ÂType "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "i686-pc-linux-gnu".
>> For bug reporting instructions, please see:
>> <http://www.gnu.org/software/gdb/bugs/>...
>> Reading symbols from /local/lmckhou/testing/a.out...done.
>> (gdb) l
>> 1 Â Â Â int main()
>> 2 Â Â Â {
>> 3 Â Â Â Â int a = 0;
>> 4 Â Â Â Â int b = 1;
>> 5 Â Â Â Â return 0;
>> 6 Â Â Â }
>> (gdb) start
>> Temporary breakpoint 1 at 0x8048415: file a.cc, line 3.
>> Starting program: /local/lmckhou/testing/a.out
>>
>> Temporary breakpoint 1, main () at a.cc:3
>> 3 Â Â Â Â int a = 0;
>> (gdb) record
>> (gdb) record
>> Process record target already running, do you want to delete the old record log?(y or [n]) y
>> (gdb) n
>> Segmentation fault
>>
>> Here is the backtrace:
>> ï(gdb) bt
>> #0 Â0xb7d2e449 in _int_malloc () from /lib/libc.so.6
>> #1 Â0xb7d2fce6 in malloc () from /lib/libc.so.6
>> #2 Â0x0808f564 in xmalloc (size=16) at ../../src/gdb/utils.c:1229
>> #3 Â0x0808e585 in make_my_cleanup2 (pmy_chain=0x84003e0, function=0x808e50b <restore_integer>, arg=0x8d0cf50, free_arg=0x808f63b <xfree>)
>> Â Âat ../../src/gdb/utils.c:349
>> #4 Â0x0808e571 in make_cleanup_restore_integer (variable=0x8413190) at ../../src/gdb/utils.c:340
>> #5 Â0x0822724e in record_gdb_operation_disable_set () at ../../src/gdb/record.c:414
>> #6 Â0x082283aa in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1081
>> #7 Â0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #8 Â0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #9 Â0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #10 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #11 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #12 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> #13 0x082283c2 in record_insert_breakpoint (gdbarch=0x848c7d8, bp_tgt=0x84e2aa4) at ../../src/gdb/record.c:1082
>> ...
>>
>> This continues over and over and over ....
>>
>> Thanks
>>
>>
>